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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0AA1-231 Through U0424-537 >> DTC U0110-159 Lost Communication with Driver Motor Control Module; DTC U0110-656 Lost Communication with Driver Motor Control Module; DTC U0110-657 Lost Communication with Driver Motor Control Module >> Inspection Procedure

Inspection Procedure

CAUTION:
  • 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.
  • 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. Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.
      WAVEFORM SIGNAL REFERENCE

      Item Contents
      Terminal MTH+ (H34-28) - E1 (H31-5) MTH- (H34-27) - E1 (H31-5)
      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 

    Fig 1: Inspecting Hybrid Vehicle Control ECU
    G05278844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

  2. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.
      WAVEFORM SIGNAL REFERENCE

      Item Contents
      Terminal CLK+ (H34-22) - E1 (H31-5) CLK- (H34-29) - E1 (H31-5)
      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 

    Fig 2: Checking Hybrid Vehicle Control ECU
    G05278845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.
      WAVEFORM SIGNAL REFERENCE

      Item Contents
      Terminal REQ+ (H34-23) - E1 (H31-5) REQ- (H34-30) - E1 (H31-5)
      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 

    Fig 3: Checking Hybrid Vehicle Control ECU
    G05278846Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU) 
    CAUTION: Be sure to wear insulated gloves.
    1. Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
    2. Disconnect the H34 connector from the HV control ECU.
    3. Remove the inverter cover. (See INVERTER WITH CONVERTER )
      NOTE:
      • Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
      • Be sure to prevent water in the reservoir tank from entering the inverter.
      • Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
    4. Disconnect the I21 connector from the MG ECU.
    5. 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.

      Fig 4: Disconnecting I21 Connector From MG ECU
      G05278847Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      MTH+ (H34-28) - Body ground Below 1 V
      MTH- (H34-27) - Body ground Below 1 V
    6. Turn the ignition switch off.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      MTH+ (H34-28) - MTH+ (I21-9) Below 1 Ω
      MTH- (H34-27) - MTH- (I21-10) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      MTH+ (H34-28) or MTH+ (I21-9) - Body ground 10 kΩ or higher
      MTH- (H34-27) or MTH- (I21-10) - 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. Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
    2. Disconnect the H34 connector from the HV control ECU.
    3. Remove the inverter cover. (See INVERTER WITH CONVERTER )
      NOTE:
      • Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
      • Be sure to prevent water in the reservoir tank from entering the inverter.
      • Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
    4. Disconnect the I21 connector from the MG ECU.
    5. 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.

      Fig 5: Disconnecting H34 Connector From HV Control ECU
      G05278848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      CLK+ (H34-22) - Body ground Below 1 V
      CLK- (H34-29) - Body ground Below 1 V
    6. Turn the ignition switch off.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      CLK+ (H34-22) - CLK+ (I21-17) Below 1 Ω
      CLK- (H34-29) - CLK- (I21-18) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      CLK+ (H34-22) or CLK+ (I21-17) - Body ground 10 kΩ or higher
      CLK- (H34-29) or CLK- (I21-18) - 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. Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
    2. Disconnect the H34 connector from the HV control ECU.
    3. Remove the inverter cover. (See INVERTER WITH CONVERTER )
      NOTE:
      • Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
      • Be sure to prevent water in the reservoir tank from entering the inverter.
      • Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
    4. Disconnect the I21 connector from the MG ECU.
    5. 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.

      Fig 6: Disconnecting I21 Connector From MG ECU
      G05278849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      REQ+ (H34-23) - Body ground Below 1 V
      REQ- (H34-30) - Body ground Below 1 V
    6. Turn the ignition switch off.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      REQ+ (H34-23) - REQ+ (I21-15) Below 1 Ω
      REQ- (H34-30) - REQ- (I21-16) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      REQ+ (H34-23) or REQ+ (I21-15) - Body ground 10 kΩ or higher
      REQ- (H34-30) or REQ- (I21-16) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

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