DTC    U1002    Lost Communication with Gateway Module (Power Management2)

for Preparation Click here


DESCRIPTION

  1. The power management control ECU will store this DTC when no signals can be received from the ECUs that have been memorized as those that are connected to the power management bus.
  2. When the power management control ECU receives a response signal from the ECUs connected to the power management bus, the power management control ECU recognizes and memorizes that the ECU is connected to the power management bus. Based on this memorized data, the power management control ECU monitors for malfunctions in the ECUs connected to the power management bus when communicating with those ECUs. If the power management control ECU cannot receive response signals from the ECUs that have been memorized as those connected to the power management bus, the power management control ECU determines that a malfunction exists.

DTC No.
DTC Detection Condition
Trouble Area
U1002
Power management control ECU cannot receive signals from all ECUs that have been memorized as those connected to the power management bus.
  1. Open or short in power management bus main line or connector
  2. Open or short in power management bus branch line or connector
  3. Power management control ECU
  4. ECM
  5. Air conditioning amplifier assembly
  6. Skid control ECU (Brake booster with master cylinder assembly)
  7. CAN No. 1 junction connector (for LHD)
  8. CAN No. 3 junction connector (for RHD)
  9. CAN No. 5 junction connector

HINT:
This diagnosis procedure is for when DTC U1002 is output by the power management control ECU (Intelligent tester display: PM2 Gateway).


WIRING DIAGRAM


C236204E04


INSPECTION PROCEDURE

NOTICE:
  1. After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).
  2. Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
  3. Turn the power switch off before inspecting CAN bus lines for a ground short.
  4. After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  5. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
  1. Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  2. Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

1.CHECK CAN BUS LINES

  1. Turn the power switch off.



    C235253E02

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    		Result
    H4-31 (CA3P) - H4-30 (CA3N)
    		Power switch off
    		54 to 69 Ω
    		Below 54 Ω:
    Short circuit between bus lines
    70 Ω or higher:
    Open circuit in a main bus line
    H4-31 (CA3P) - H4-4 (E12)
    		Power switch off
    		200 Ω or higher
    		Below 200 Ω:
    CANH ground short
    H4-30 (CA3N) - H4-4 (E12)
    		Power switch off
    		200 Ω or higher
    		Below 200 Ω:
    CANL ground short

  1. Disconnect the cable from the negative (-) auxiliary battery terminal.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    		Result
    H4-31 (CA3P) - H4-7 (AM21)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Below 6 kΩ:
    CANH +B short
    H4-30 (CA3N) - H4-7 (AM21)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Below 6 kΩ:
    CANL +B short

    Text in Illustration 
    *a
    		Component with harness connector
    (Power Management Control ECU)

    Result:
    Result
    		Proceed to
    OK
    		A
    Open circuit in CAN main bus line
    		B
    Short circuit between bus lines
    		C
    1. Ground short
    2. +B short
    		D



B
Go to step 3

C
Go to step 14

D
Go to step 32
A


2.CHECK FOR DTC OUTPUT

  1. Clear the DTCs.

  1. Turn the power switch off.

  1. Turn the power switch on (IG) and recheck for DTCs.

    Result:
    Result
    		Proceed to
    U1002 is output from power management control ECU
    (Intelligent tester display/PM2 Gateway)
    		A
    Other DTC is output
    		B



B
GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC
A

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)  

3.CHECK FOR OPEN IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU)


    A204446E25

  1. Disconnect the power management control ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H4-31 (CA3P) - H4-30 (CA3N)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Rear view of wire harness connector
    (to Power Management Control ECU)

    Result:
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C



B
Go to step 4

C
Go to step 9
A

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)  

4.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)

  1. Reconnect the power management control ECU connector.

  1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.



    C234634E09

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H97-2 (CANH) - H97-3 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to CAN No. 1 Junction Connector



NG
Go to step 6
OK


5.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side.

  1. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.



    C234634E10

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H98-6 (CANH) - H98-4 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to Power Management Control ECU



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)
OK

REPLACE CAN NO. 5 JUNCTION CONNECTOR 

6.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector rear side.

  1. Disconnect the instrument panel wire from the CAN No. 1 junction connector.



    C234634E11

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H112-3 (CANH) - H112-9 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    *b
    		to CAN No. 5 Junction Connector



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)
OK


7.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - ECM)

  1. Reconnect the instrument panel wire to the CAN No. 1 junction connector.

  1. Disconnect the engine room main wire from the CAN No. 1 junction connector.



    C234634E12

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A57-4 (CANH) - A57-10 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    *b
    		to ECM



NG
Go to step 8
OK

REPLACE CAN NO. 1 JUNCTION CONNECTOR 

8.CHECK FOR OPEN IN CAN BUS LINES (ECM)

  1. Reconnect the engine room main wire to the CAN No. 1 junction connector.



    A192807E56

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A60-12 (CANP) - A60-4 (CANN)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to ECM)



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)
OK

REPLACE ECM (Click here)  

9.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 3 J/C)

  1. Reconnect the power management control ECU connector.

  1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.



    C234634E09

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H97-2 (CANH) - H97-3 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to CAN No. 3 Junction Connector



NG
Go to step 11
OK


10.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side.

  1. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.



    C234634E10

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H98-6 (CANH) - H98-4 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to Power Management Control ECU



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)
OK

REPLACE CAN NO. 5 JUNCTION CONNECTOR 

11.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 3 J/C - CAN NO. 5 J/C)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector rear side.

  1. Disconnect the instrument panel wire from the CAN No. 3 junction connector.



    C234634E23

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H142-3 (CANH) - H142-9 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 3 Junction Connector)
    *b
    		to CAN No. 5 Junction Connector



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)
OK


12.CHECK FOR OPEN IN CAN BUS LINE (CAN NO. 3 J/C - ECM)

  1. Reconnect the instrument panel wire to the CAN No. 3 junction connector.

  1. Disconnect the engine room main wire from the CAN No. 3 junction connector.



    C234634E24

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A72-4 (CANH) - A72-10 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 3 Junction Connector)
    *b
    		to ECM



NG
Go to step 13
OK

REPLACE CAN NO. 3 JUNCTION CONNECTOR 

13.CHECK FOR OPEN IN CAN BUS LINES (ECM)

  1. Reconnect the engine room main wire to the CAN No. 3 junction connector.



    A192807E56

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A60-12 (CANP) - A60-4 (CANN)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to ECM)



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - ECM)
OK

REPLACE ECM (Click here)  

14.CHECK FOR SHORT IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU)


    A204446E25

  1. Disconnect the power management control ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H4-31 (CA3P) - H4-30 (CA3N)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Rear view of wire harness connector
    (to Power Management Control ECU)



NG
Go to step 15
OK

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)  

15.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

  1. Reconnect the power management control ECU connector.

  1. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.



    C234634E10

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H98-6 (CANH) - H98-4 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to Power Management Control ECU

    Result:
    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C



B
Go to step 24

C
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)
A


16.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)

  1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.



    C234634E09

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H97-2 (CANH) - H97-3 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to CAN No. 1 Junction Connector



NG
Go to step 19
OK


17.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Disconnect the air conditioning amplifier assembly connector.



    C234634E13

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H98-5 (CANH) - H98-3 (CANL)
    		Power switch off
    		1 MΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to Air Conditioning Amplifier Assembly



NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)
OK


18.CHECK FOR SHORT IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.



    C188241E78

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H85-11 (CANH) - H85-12 (CANL)
    		Power switch off
    		54 to 69 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)



NG
REPLACE CAN NO. 5 JUNCTION CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)  

19.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.

  1. Disconnect the instrument panel wire from the CAN No. 1 junction connector.



    C234634E11

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H112-3 (CANH) - H112-9 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    *b
    		to CAN No. 5 Junction Connector



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)
OK


20.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - ECM)

  1. Disconnect the engine room main wire from the CAN No. 1 junction connector.



    C234634E12

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A57-4 (CANH) - A57-10 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    *b
    		to ECM



NG
Go to step 23
OK


21.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - SKID CONTROL ECU)

  1. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.



    C234634E14

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A57-3 (CANH) - A57-9 (CANL)
    		Power switch off
    		1 MΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    *b
    		to Skid Control ECU



NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 1 J/C - SKID CONTROL ECU)
OK


22.CHECK FOR SHORT IN CAN BUS LINES (SKID CONTROL ECU)

  1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 1 junction connector.



    C209401E58

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A61-35 (CA2H) - A61-34 (CA2L)
    		Power switch off
    		54 to 69 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Skid Control ECU)

    Result:
    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) (Click here)

C
REPLACE CAN NO. 1 JUNCTION CONNECTOR
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) (Click here)  

23.CHECK FOR SHORT IN CAN BUS LINES (ECM)

  1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 1 junction connector.



    A192807E56

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A60-12 (CANP) - A60-4 (CANN)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to ECM)



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)
OK

REPLACE ECM (Click here)  

24.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 3 J/C)

  1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.



    C234634E09

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H97-2 (CANH) - H97-3 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to CAN No. 3 Junction Connector



NG
Go to step 27
OK


25.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Disconnect the air conditioning amplifier assembly connector.



    C234634E13

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H98-5 (CANH) - H98-3 (CANL)
    		Power switch off
    		1 MΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    *b
    		to Air Conditioning Amplifier Assembly



NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)
OK


26.CHECK FOR SHORT IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.



    C188241E78

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H85-11 (CANH) - H85-12 (CANL)
    		Power switch off
    		54 to 69 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)



NG
REPLACE CAN NO. 5 JUNCTION CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)  

27.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - CAN NO. 5 J/C)

  1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.

  1. Disconnect the instrument panel wire from the CAN No. 3 junction connector.



    C234634E23

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H142-3 (CANH) - H142-9 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 3 Junction Connector)
    *b
    		to CAN No. 5 Junction Connector



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)
OK


28.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - ECM)

  1. Disconnect the engine room main wire from the CAN No. 3 junction connector.



    C234634E24

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A72-4 (CANH) - A72-10 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 3 Junction Connector)
    *b
    		to ECM



NG
Go to step 31
OK


29.CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - SKID CONTROL ECU)

  1. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.



    C234634E25

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A72-3 (CANH) - A72-9 (CANL)
    		Power switch off
    		1 MΩ or higher

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 3 Junction Connector)
    *b
    		to Skid Control ECU



NG
REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 3 J/C - SKID CONTROL ECU)
OK


30.CHECK FOR SHORT IN CAN BUS LINES (SKID CONTROL ECU)

  1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 3 junction connector.



    C209401E58

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A61-35 (CA2H) - A61-34 (CA2L)
    		Power switch off
    		54 to 69 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Skid Control ECU)

    Result:
    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) (Click here)

C
REPLACE CAN NO. 3 JUNCTION CONNECTOR
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) (Click here)  

31.CHECK FOR SHORT IN CAN BUS LINES (ECM)

  1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 3 junction connector.



    A192807E56

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A60-12 (CANP) - A60-4 (CANN)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to ECM)



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - ECM)
OK

REPLACE ECM (Click here)  

32.CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C)

  1. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.



  1. Measure the resistance according to the value(s) in the table below.


    C235267E01


    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    		Connected to
    H98-6 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		Power management control ECU
    H98-4 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    H98-5 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		Air conditioning amplifier assembly
    H98-3 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    H98-6 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    		Power management control ECU
    H98-4 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short
    H98-5 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    		Air conditioning amplifier assembly
    H98-3 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short


    Text in Illustration 
    *1
    		DLC3
    		-
    		-
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    		*b
    		to Air Conditioning Amplifier Assembly
    *c
    		to Power Management Control ECU
    		-
    		-

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.



NG
Go to step 36
OK


33.CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C MAIN LINE)

  1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.



  1. Measure the resistance according to the value(s) in the table below.


    C235267E02


    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    		Connected to
    H97-2 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		CAN No. 1 junction connector
    H97-3 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    H97-2 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    H97-3 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short


    Text in Illustration 
    *1
    		DLC3
    		-
    		-
    *a
    		Front view of wire harness connector
    (to CAN No. 5 Junction Connector)
    		*b
    		to CAN No. 1 Junction Connector

    Result:
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.



B
Go to step 34

C
Go to step 37
A

REPLACE CAN NO. 5 JUNCTION CONNECTOR 

34.CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C - CAN NO. 1 J/C)

  1. Disconnect the instrument panel wire from the CAN No. 1 junction connector.



  1. Measure the resistance according to the value(s) in the table below.


    C235267E04


    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    		Connected to
    H112-3 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		CAN No. 5 junction connector
    H112-9 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    H112-3 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    H112-9 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short


    Text in Illustration 
    *1
    		DLC3
    		-
    		-
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    		*b
    		to CAN No. 5 Junction Connector

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)
OK


35.CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 1 J/C)

  1. Disconnect the engine room main wire from the CAN No. 1 junction connector.



  1. Measure the resistance according to the value(s) in the table below.


    C235267E03


    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    		Connected to
    A57-3 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		Skid control ECU
    A57-9 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    A57-4 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		ECM
    A57-10 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    A57-3 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    		Skid control ECU
    A57-9 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short
    A57-4 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    		ECM
    A57-10 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.


    Text in Illustration 
    *1
    		DLC3
    		-
    		-
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    		*b
    		to Skid Control ECU
    *c
    		to ECM
    		-
    		-



B
Go to step 36
OK

REPLACE CAN NO. 1 JUNCTION CONNECTOR 

36.CHECK CAN BUS LINE (ECU)

  1. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to B+ or shorted to GND is connected.



    C235253E02

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    H4-31 (CA3P) - H4-4 (E12)
    		Power switch off
    		200 Ω or higher
    		Below 200 Ω:
    CANH ground short
    H4-30 (CA3N) - H4-4 (E12)
    		Power switch off
    		200 Ω or higher
    		Below 200 Ω:
    CANL ground short
    H4-31 (CA3P) - H4-7 (AM21)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Below 6 kΩ:
    CANH +B short
    H4-30 (CA3N) - H4-7 (AM21)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Below 6 kΩ:
    CANL +B short

    Text in Illustration 
    *a
    		Component with harness connector
    (Power Management Control ECU)

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.



NG
REPAIR OR REPLACE CORRESPONDING ECU WIRE
OK

REPLACE CORRESPONDING ECU 

37.CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C - CAN NO. 3 J/C)

  1. Disconnect the instrument panel wire from the CAN No. 3 junction connector.



  1. Measure the resistance according to the value(s) in the table below.


    C235267E05


    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    		Connected to
    H142-3 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		CAN No. 5 junction connector
    H142-9 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    H142-3 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    H142-9 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short


    Text in Illustration 
    *1
    		DLC3
    		-
    		-
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    		*b
    		to CAN No. 5 Junction Connector

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)
OK


38.CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 3 J/C)

  1. Disconnect the engine room main wire from the CAN No. 3 junction connector.



  1. Measure the resistance according to the value(s) in the table below.


    C235267E06


    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    		Connected to
    A72-3 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		Skid control ECU
    A72-9 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    A72-4 (CANH) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANH ground short
    		ECM
    A72-10 (CANL) - H44-4 (CG)
    		Power switch off
    		200 Ω or higher
    		Inspection for CANL ground short
    A72-3 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    		Skid control ECU
    A72-9 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short
    A72-4 (CANH) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANH +B short
    		ECM
    A72-10 (CANL) - H44-16 (BAT)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Inspection for CANL +B short

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.


    Text in Illustration 
    *1
    		DLC3
    		-
    		-
    *a
    		Front view of wire harness connector
    (to CAN No. 3 Junction Connector)
    		*b
    		to Skid Control ECU
    *c
    		to ECM
    		-
    		-



NG
Go to step 39
OK

REPLACE CAN NO. 3 JUNCTION CONNECTOR 

39.CHECK FOR SHORT IN CAN BUS LINE (ECU)

  1. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to B+ or shorted to GND is connected.



    C235253E02

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    		Purpose
    H4-31 (CA3P) - H4-4 (E12)
    		Power switch off
    		200 Ω or higher
    		Below 200 Ω:
    CANH ground short
    H4-30 (CA3N) - H4-4 (E12)
    		Power switch off
    		200 Ω or higher
    		Below 200 Ω:
    CANL ground short
    H4-31 (CA3P) - H4-7 (AM21)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Below 6 kΩ:
    CANH +B short
    H4-30 (CA3N) - H4-7 (AM21)
    		Cable disconnected from negative (-) auxiliary battery terminal
    		6 kΩ or higher
    		Below 6 kΩ:
    CANL +B short

    Text in Illustration 
    *a
    		Component with harness connector
    (Power Management Control ECU)

    HINT:
    It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Power Management Bus inspection.



NG
REPAIR OR REPLACE CORRESPONDING ECU WIRE
OK

REPLACE CORRESPONDING ECU