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Home >> Lexus >> 2008 >> RX 400h FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 159 (Hybrid Vehicle Control (P310) - RX400H - DTC P0AEE-276 Through U0110-160) >> 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

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
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.
      HYBRID VEHICLE CONTROL ECU

      Item Contents
      Terminal MTH+ (H34-28) - E1 (H31-5)
      MTH- (H34-27) - E1 (H31-5)
      Equipment Setting 1 V/DIV, 5 ms/DIV
      1 V/DIV, 200 ms/DIV
      Condition READY-on state
      Fig 1: Inspecting Hybrid Vehicle Control ECU
      G04112379Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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: 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.
      HYBRID VEHICLE CONTROL ECU

      Item Contents
      Terminal CLK+ (H34-22) - E1 (H31-5)
      CLK- (H34-29) - E1 (H31-5)
      Equipment Setting 1 V/DIV, 1 s/DIV
      Condition READY-on state
      Fig 2: Inspecting Hybrid Vehicle Control ECU
      G04112380Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      The waveform appears as shown in the illustration. 

    NG: Go to step   5 

    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.
      HYBRID VEHICLE CONTROL ECU

      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
      Fig 3: Inspecting Hybrid Vehicle Control ECU
      G04112381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: 

      The waveform appears as shown in the illustration. 

    NG: Go to step   6 

    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 PRECAUTION )
    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.

      Standard Voltage 

      HV CONTROL ECU - MG ECU (VOLTAGE)

      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) 

      HV CONTROL ECU - MG ECU (CHECK FOR OPEN)

      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) 

      HV CONTROL ECU - MG ECU (CHECK FOR SHORT)

      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
      Fig 4: Checking For Harness And Connector (HV Control ECU - MG ECU)
      G04112382Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 PRECAUTION )
    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.

      Standard Voltage 

      HV CONTROL ECU - MG ECU (VOLTAGE)

      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) 

      HV CONTROL ECU - MG ECU (CHECK FOR OPEN)

      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) 

      HV CONTROL ECU - MG ECU (CHECK FOR SHORT)

      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
      Fig 5: Checking Harness And Connector (HV Control ECU - MG ECU)
      G04112383Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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 PRECAUTION )
    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.

      Standard Voltage 

      HV CONTROL ECU - MG ECU (VOLTAGE)

      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) 

      HV CONTROL ECU - MG ECU (CHECK FOR OPEN)

      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) 

      HV CONTROL ECU - MG ECU (CHECK FOR SHORT)

      Tester Connection Specified Condition
      REQ+ (H34-23) or REQ+ (I21-15) - Body ground 10 kΩ or higher
      REQ+ (H34-23) or REQ+ (I21-15) - Body ground 10 kΩ or higher
      Fig 6: Checking Harness And Connector (HV Control ECU - MG ECU)
      G04112384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP: REPLACE HYBRID VEHICLE CONTROL ECU 

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