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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 P0336-137 Through P0A72-326 >> DTC P0A05-776 Motor Electronics Coolant Pump Control Circuit / Open >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (WATER PUMP) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CLEAR DTC.
    4. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / WATER PUMP.
    5. During the WATER PUMP active test, check operation of the water pump.

      OK: There are ripples in the reservoir tank coolant. 

      HINT:

      The water pump is also activated in the READY-on state.

    NG: GO TO step   5 

    OK: Go to next step 

  2. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / WATER PUMP.
    4. During the WATER PUMP active test, check for pulse signals according to the table below.
      PULSE SIGNAL REFERENCE

      Item Contents
      Terminal NIWP (H29-29) - E1 (H31-5)
      Equipment Setting 5 V/DIV, 2 ms/DIV
      Condition During WATER PUMP active test

      OK: The waveform appears as shown in the illustration. 

    OK: GO TO step   11 

    Fig 1: Identifying H31 And H29 Connector Terminals
    G05278363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - WATER PUMP) 
    1. Turn the ignition switch off.
    2. Disconnect the H29 connector from the HV control ECU.
    3. Disconnect the W5 water pump connector.
    4. 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
      IWP (H29-23) - SWP (W5-2) Below 1 Ω
      NIWP (H29-29) - NWP (W5-1) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      IWP (H29-23) or SWP (W5-2) - Body ground 100 kΩ or higher
      NIWP (H29-29) or NWP (W5-1) - Body ground 100 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Disconnecting H29 Connector From HV Control ECU
    G05278364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  4. INSPECT WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 
    1. Disconnect the W5 water pump connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      NWP (W5-1) - GND (W5-3) 1 MΩ or higher

    NG: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

    Fig 3: Identifying W5 Water Pump Connector Terminals
    G05278365Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

  5. CHECK HARNESS AND CONNECTOR (WATER PUMP) 
    1. Turn the ignition switch off.
    2. Disconnect the W5 water pump w/ motor & bracket assembly connector.
      Fig 4: Identifying Water Pump W/ Motor & Bracket Assembly Connector
      G05201245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      +BWP (W5-4) - GND (W5-3) 9 to 14 V

    NG: REPLACE FUSE AND REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 5: Identifying W5 Water Pump W/ Motor & Bracket Assembly Connector Terminals
    G05278367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  6. CHECK COOLANT HOSE 
    1. Check if the hoses of the cooling system are not bent or clogged.

      OK: The hoses of the cooling system are not bent or clogged. 

    NG: CORRECT TO NORMAL CONDITION 

    Fig 6: Identifying Water Pump W/ Motor And Bracket Assembly
    G05201236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - WATER PUMP) 
    1. Turn the ignition switch off.
    2. Disconnect the H29 connector from the HV control ECU.
    3. Disconnect the W5 water pump w/ motor & bracket assembly connector.
    4. 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
      IWP (H29-23) - SWP (W5-2) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      IWP (H29-23) or SWP (W5-2) - Body ground 100 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 7: Disconnecting W5 Water Pump W/ Motor & Bracket Assembly Connector
    G05278369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  8. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Connect the HV control ECU connector and water pump w/ motor & bracket assembly connector.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      IWP (H29-23) - E1 (H31-5) Below 1 V

    OK: GO TO step   10 

    Fig 8: Identifying H31 And H29 Connector Terminals
    G05278370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

  9. INSPECT WATER PUMP W/ MOTOR & BRACKET ASSEMBLY (SWP TERMINAL VOLTAGE) 
    1. Disconnect the H29 connector from the HV control ECU.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      IWP (H29-23) - E1 (H31-5) 9 to 14V

    NG: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

    Fig 9: Disconnecting H29 HV Control ECU Connector
    G05278371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

  10. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Put the vehicle into the READY-on state.
    2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      IWP (H29-23) - E1 (H31-5) 9 to 14 V

    OK: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

    Fig 10: Identifying HV Control ECU Connectors
    G05278372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

  11. READ OUTPUT DTC (HV) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / DTC INFO / CURRENT CODES.
    4. Read output DTC. (See DTC CHECK / CLEAR )

      Result: DTC P0A05-776 is output. 

    YES: REPLACE HYBRID VEHICLE CONTROL ECU 

    NO: Go to next step 

  12. PERFORM REPRODUCTION TEST 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to the ON position.
    3. Select the following menu items: DIAGNOSIS / OBD/ MOBD / HV ECU / ACTIVE TEST / WATER PUMP.
    4. During the WATER PUMP active test, check for pulse signals according to the table below.
      PULSE SIGNAL REFERENCE

      Item Contents
      Terminal NIWP (H29-29) - E1 (H31-5)
      Equipment Setting 5 V/DIV, 2 ms/DIV
      Condition During WATER PUMP active test
    5. Perform the following reproduction tests. (Check for intermittent problems.)
      Fig 11: Identifying H31 And H29 Connector Terminals
      G05278363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      PRODUCTION TEST REFERENCE

      Reproduction test Parts to be replaced if any abnormality is found.
      Wiggle the connector. Harness or connector
      Wiggle the harness. Harness or connector
      Vibrate the HV control ECU. (Tap gently by hand.) HV control ECU
      Vibrate the water pump.
      (Tap gently by hand.)      		 Water pump
      Heat or cool the HV control ECU HV control ECU
      Repeatedly activate and stop the water pump. When the problem is reproduced, perform inspection according to the inspection flow chart.
      Raise the temperature of the coolant (for Inverter), and repeatedly activate and stop the water pump. When the problem is reproduced, perform inspection according to the inspection flow chart.

      OK: The interval of pulse signal output is normal. 

    NG: REPAIR OR REPLACE ABNORMAL PART 

    OK: REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY 

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