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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Hybrid Control System - Diagnostic Codes (6 Of 7)) >> HYBRID CONTROL SYSTEM (for PHEV Model) >> DTC P2600-9E: Motor/Generator Coolant Pump "A" Control Circuit Stuck On [08/2023 - ] >> Procedure

DTC P2600-9E: Motor/Generator Coolant Pump "A" Control Circuit Stuck On [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (L TERMINAL VOLTAGE) 

    Pre-procedure1

    • Disconnect the oil pump with motor assembly connector.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B76-4 (L) - Body ground Ignition switch ON Below 1 V V
      NOTE:

      Turning the ignition switch to ON with the oil pump with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Reconnect the oil pump with motor assembly connector.

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY - OIL PMP RELAY) 

    Pre-procedure1

    • Disconnect the oil pump with motor assembly connector.
    • Remove the OIL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B76-4 (L) or 5 (OIL PMP relay holder) - Body ground and other terminals Ignition switch ON Below 1 V V
      NOTE:
      • Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.
      • Turning the ignition switch to ON with the oil pump with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Install the OIL PMP relay.
    • Reconnect the oil pump with motor assembly connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PMP RELAY) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connector.
    • Remove the OIL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      A21-17 (OPM2) or 1 (OIL PMP relay holder) - Body ground and other terminals Ignition switch ON Below 1 V V
      NOTE:
      • Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.
      • Turning the ignition switch to ON with the oil pump with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Turn the ignition switch off.
    • Install the OIL PMP relay.
    • Reconnect the hybrid vehicle control ECU connector.

    Result: 

    OK 

    REPLACE RELAY (OIL PMP) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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