B1498/98

DESCRIPTION

The hybrid vehicle control ECU and w/ motor compressor transmit information to one another via communication line. Compressor control is stopped and the DTC is output if communication information is cut off or abnormal information occurs.
The DTC is also detected if high-voltage power supplied from the w/ converter inverter assembly to the compressor control circuit is shut off.
The output DTC is memorized as previous trouble.

CAUTION:

1. Wear electrically insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Be sure to carry the removed service plug grip because other workers may install it by mistake.
   
2. Do not touch the high-voltage connectors or terminals for 5 minutes after the service plug grip is removed.
   

DTC No.	Detection item	Trouble Area
B1498/98	Communication line error or open between the hybrid vehicle control ECU and the w/ motor compressor assembly. High-voltage power source is shut off.	Harness or connector between hybrid vehicle control ECU and w/ motor compressor assembly and body ground Hybrid vehicle control ECU w/ Motor compressor assembly w/ Converter inverter assembly Engine wire No.4

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK DIAGNOSTIC TROUBLE CODE

1. Check if DTCs for the hybrid control system are output using the intelligent tester.

Result:

Result	Proceed to
DTC is not output	A
DTC (P3108) is output	A
Except DTC (P3108) is output	B

B	GO TO HYBRID CONTROL SYSTEM

A

2. INSPECT HEATER FUSE

1. Remove the HEATER fuse from instrument panel J/B.

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

   Resistance:

   Tester Item	Condition	Specified condition
   HEATER fuse	Always	Below 1 Ω

NG	REPLACE HEATER FUSE

OK

3. CHECK HARNESS AND CONNECTOR (W/MOTOR COMPRESSOR ASSEMBLY - BODY GROUND)

1. Disconnect the connector from the w/ motor compressor assembly.

   CAUTION:

   Do not disconnect the connector on the high-voltage side.

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

   Resistance:

   Tester connection (Symbols)	Condition	Specified condition
   C18-5 (GND) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. CHECK HARNESS AND CONNECTOR (IG1 - GND)

1. Turn the ignition switch ON.

2. Measure the voltage according to the value(s) in the table below.

   Voltage:

   Tester connection (Symbols)	Condition	Specified condition
   C18-6 (IG) - C18-5 (GND)	Ignition switch ON	10 to 14 V
   C18-6 (IG) - C18-5 (GND)	Ignition switch OFF	Below 1 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - W/MOTOR COMPRESSOR ASSEMBLY)

1. Disconnect the connector from the hybrid vehicle control ECU.

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

   Resistance:

   Tester connection (Symbols)	Condition	Specified condition
   C18-1 (CLK) - H33-14 (CLK)	Always	Below 1 Ω
   C18-2 (TOECU) - H33-15 (ITE)	Always	Below 1 Ω
   C18-3 (TOINV) - H33-16 (ETI)	Always	Below 1 Ω
   C18-1 (CLK) - Body ground	Always	10 kΩ or higher
   C18-2 (TOECU) - Body ground	Always	10 kΩ or higher
   C18-3 (TOINV) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6. INSPECT ELECTRIC VEHICLE FUSE

1. Turn the ignition switch off.

2. Remove the service plug grip.

   CAUTION:

   1. Be sure to wear insulated gloves.
      
   2. Do not touch the high-voltage connectors or terminals for 5 minutes after the service plug grip is removed.
      

   NOTICE:

   Do not start the engine with the service plug grip removed because it may cause a malfunction.

3. Remove the inverter cover.

   NOTICE:

   1. Tape the interlock round terminal for the inverter cover to prevent it from being grounded.
      
   2. Be sure to prevent foreign objects or water from entering the w/ converter inverter assembly.
      

4. Check that the A and B bolts are tightened securely.

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

   Resistance:

   Tester Item (Tester connection)	Condition	Specified condition
   ELECTRIC VEHICLE fuse (A - B)	Always	Below 1 Ω

NG	REPLACE ELECTRIC VEHICLE FUSE

OK

7. INSPECT W/CONVERTER INVERTER ASSEMBLY

CAUTION:

1. Be sure to wear insulated gloves.
   
2. Be sure to prevent foreign objects or water from entering the w/ converter inverter assembly.
   

1. Check that the 1 and 2 bolts are tightened securely.

Torque:

8.0 N*m{ 82 kgf*cm , 71 in.*lbf }

2. Disconnect the connector from the air conditioning wiring harness sub-assembly.

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

   Resistance:

   Tester connection	Condition	Specified condition
   B-3 - 1	Always	Below 1 Ω
   B-1 - 2	Always	Below 1 Ω

NG	REPLACE W/CONVERTER INVERTER ASSEMBLY

OK

8. INSPECT ENGINE WIRE NO.4

1. Disconnect the connector from the engine wire No.4.

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

   Resistance:

   Tester connection (Symbols)	Condition	Specified condition
   C19-1 (PGND) - I21-1	Always	Below 1 Ω
   C19-2 (PBAT) - I21-3	Always	Below 1 Ω
   C19-1 (PGND) - C19-2 (PBAT)	Always	10 kΩ or higher

NG	REPAIR OR REPLACE ENGINE WIRE NO.4

OK

9. INSPECT W/MOTOR COMPRESSOR ASSEMBLY

1. Reconnect the connectors to the engine wire No.4, the air conditioner harness, the hybrid vehicle control ECU and the w/ motor compressor assembly.

2. Turn the ignition switch ON.

3. Measure the waveform according to the condition in the table below.

   1. CLK - Body ground

      OK:

      Waveform appears
      

      HINT:

      Waveform cycle varies with the communication contents.

   2. ITE - Body ground

      OK:

      Waveform appears
      

      HINT:

      Waveform cycle varies with the communication contents.

NG	REPLACE W/MOTOR COMPRESSOR ASSEMBLY

OK
GO TO HYBRID CONTROL SYSTEM