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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 P2602-767 Coolant Pump Control Circuit Low >> Inspection Procedure

Inspection Procedure

NOTE:
  • When troubleshooting the oil pump w/ motor assembly, check for the following conditions:
    • ATF temperature inside the oil cooler is 5°C (41°F) or more.
    • Value of the ambient temperature sensor is 5°C (41°F) or more.
  1. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP W/ MOTOR ASSEMBLY) 
    1. Disconnect the H34 HV control ECU connector.
    2. Disconnect the oil pump w/ motor assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      OPST (H34-7) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Disconnecting H34 HV Control ECU Connector
    G05278774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. INSPECT OIL PUMP W/ MOTOR ASSEMBLY 
    1. Disconnect the O9 oil pump w/ motor assembly 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
      OPST (O9-2) - Body ground 10 kΩ or higher

    NG: REPLACE OIL PUMP W/ MOTOR ASSEMBLY 

    Fig 2: Identifying O12 Connector Terminals
    G05278775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE HYBRID VEHICLE CONTROL ECU 

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