RX400h · Service Manual HYBRID SYSTEM

U0110-159

Diagnostic trouble codes

DESCRIPTION

Refer to the description of the w/ converter inverter assembly. (Click here)
The w/ converter inverter assembly (MG ECU) controls the Motor based on a command from the HV control ECU via serial communication.
The w/ converter inverter assembly (MG ECU) monitors communication data and detects a malfunction.
DTC No.
 INF Code
 DTC Detection Condition
 Trouble Area
U0110
 159
 Error in reception from w/ converter inverter assembly (MG ECU) via serial communication (out of communication standard)
  1. Wire harness or connector
  2. w/ converter inverter assembly (MG ECU)
  3. HV control ECU
U0110
 656
 Error in reception from w/ converter inverter assembly (MG ECU) via serial communication (out of communication standard)
  1. Wire harness or connector
  2. w/ converter inverter assembly (MG ECU)
  3. HV control ECU
U0110
 657
 Error in reception from w/ converter inverter assembly (MG ECU) via serial communication (no reception)
  1. Wire harness or connector
  2. w/ converter inverter assembly (MG ECU)
  3. HV control ECU

WIRING DIAGRAM

A113962E02

INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
  2. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:
At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.


1. INSPECT HYBRID VEHICLE CONTROL ECU

  1. A115067E02
    Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.
    Item
    		 Contents
    Terminal
    		 MTH+ (H31-28) - E1 (H32-5)
    MTH- (H31-27) - E1 (H32-5)
    Equipment Setting
    		 1 V/DIV, 5 μs/DIV
    1 V/DIV, 200 μs/DIV
    Condition
    		 READY-on state

    OK:
    The waveform appears as shown in the illustration.

    HINT:
    The waveform varies depending on the contents of communication.



 OK
REPLACE HYBRID VEHICLE CONTROL ECU
NG


2. INSPECT HYBRID VEHICLE CONTROL ECU

  1. A109606E02
    Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.
    Item
    		 Contents
    Terminal
    		 CLK+ (H31-22) - E1 (H32-5)
    CLK- (H31-29) - E1 (H32-5)
    Equipment Setting
    		 1 V/DIV, 1 μs/DIV
    Condition
    		 READY-on state

    OK:
    The waveform appears as shown in the illustration.



 NG
Go to step 5
OK


3. INSPECT HYBRID VEHICLE CONTROL ECU

  1. A109607E02
    Set the intelligent tester to oscilloscope mode.

  1. Connect the intelligent tester to the HV control ECU terminals specified in the table below and check the waveform.

    Item
    		 Contents
    Terminal
    		 REQ+ (H31-23) - E1 (H32-5)
    REQ- (H31-30) - E1 (H32-5)
    Equipment Setting
    		 1 V/DIV, 1 ms/DIV
    Condition
    		 READY ON

    OK:
    The waveform appears as shown in the illustration.



 NG
Go to step 6
OK


4. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU)

CAUTION:
Be sure to wear insulated gloves.

  1. A108501E10
    Turn the ignition switch off and remove the service plug grip. (Click here)

  1. Disconnect the H31 connector from the HV control ECU.

  1. Remove the inverter cover. (Click here)

    NOTICE:
    1. Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
    2. Be sure to prevent water in the reservoir tank from entering the inverter.
    3. Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.

  1. Disconnect the I25 connector from the MG ECU.

  1. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

    HINT:
    Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTCs to be output.

    Standard Voltage:
    Tester Connection
    		 Specified Condition
    MTH+ (H31-28) - Body ground
    		 Below 1 V
    MTH- (H31-27) - Body ground
    		 Below 1 V

  1. Turn the ignition switch off.

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

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    MTH+ (H31-28) - MTH+ (I25-9)
    		 Below 1 Ω
    MTH- (H31-27) - MTH- (I25-10)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    MTH+ (H31-28) or MTH+ (I25-9) - Body ground
    		 10 kΩ or higher
    MTH- (H31-27) or MTH- (I25-10) - Body ground
    		 10 kΩ or higher
    HV control ECU or MG ECU - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE W/ CONVERTER INVERTER ASSEMBLY

5. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU)

CAUTION:
Be sure to wear insulated gloves.

  1. A108501E11
    Turn the ignition switch off and remove the service plug grip. (Click here)

  1. Disconnect the H31 connector from the HV control ECU.

  1. Remove the inverter cover. (Click here)

    NOTICE:
    1. Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
    2. Be sure to prevent water in the reservoir tank from entering the inverter.
    3. Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.

  1. Disconnect the I25 connector from the MG ECU.

  1. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

    HINT:
    Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTCs to be output.

    Standard Voltage:
    Tester Connection
    		 Specified Condition
    CLK+ (H31-22) - Body ground
    		 Below 1 V
    CLK- (H31-29) - Body ground
    		 Below 1 V

  1. Turn the ignition switch off.

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

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    CLK+ (H31-22) - CLK+ (I25-17)
    		 Below 1 Ω
    CLK- (H31-29) - CLK- (I25-18)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    CLK+ (H31-22) or CLK+ (I25-17) - Body ground
    		 10 kΩ or higher
    CLK- (H31-29) or CLK- (I25-18) - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE CONTROL ECU

6. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU)

CAUTION:
Be sure to wear insulated gloves.

  1. A108501E12
    Turn the ignition switch off and remove the service plug grip. (Click here)

  1. Disconnect the H31 connector from the HV control ECU.

  1. Remove the inverter cover. (Click here)

    NOTICE:
    1. Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
    2. Be sure to prevent water in the reservoir tank from entering the inverter.
    3. Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.

  1. Disconnect the I25 connector from the MG ECU.

  1. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

    HINT:
    Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTCs to be output.

    Standard Voltage:
    Tester Connection
    		 Specified Condition
    REQ+ (H31-23) - Body ground
    		 Below 1 V
    REQ- (H31-30) - Body ground
    		 Below 1 V

  1. Turn the ignition switch off.

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

    Standard Resistance (Check for open):
    Tester Connection
    		 Specified Condition
    REQ+ (H31-23) - REQ+ (I25-15)
    		 Below 1 Ω
    REQ- (H31-30) - REQ- (I25-16)
    		 Below 1 Ω

    Standard Resistance (Check for short):
    Tester Connection
    		 Specified Condition
    REQ+ (H31-23) or REQ+ (I25-15) - Body ground
    		 10 kΩ or higher
    REQ+ (H31-23) or REQ+ (I25-15) - Body ground
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE HYBRID VEHICLE CONTROL ECU


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