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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 P2600-31: Motor/Generator Coolant Pump "A" Control Circuit No Signal [08/2023 - ] >> Procedure

DTC P2600-31: Motor/Generator Coolant Pump "A" Control Circuit No Signal [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 CONNECTOR CONNECTION CONDITION (OIL PUMP WITH MOTOR ASSEMBLY CONNECTOR) 
    1. Check the connector connections and contact pressure of the relevant terminals for the oil pump with motor assembly connector.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

      OK

      The connector is connected securely and there are no contact problems.

      GTY1204648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  3

  3. CHECK FUSE (OIL PMP) 

    Pre-procedure1

    • Remove the OIL PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      OIL PMP fuse Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the OIL PMP fuse.

    Result: 

    NG 

    REPLACE FUSE (OIL PMP) 

    Result: 

    OK 

    See step  4

  4. INSPECT RELAY (OIL PMP) 

    Pre-procedure1

    • Remove the OIL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Measure the resistance according to the value(s) in the table below.
      GTY447534Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      3 - 5 Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher kΩ
      3 - 5 Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the OIL PMP relay.

    Result: 

    NG 

    REPLACE OIL PMP RELAY 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (OIL PMP FUSE - OIL PMP RELAY) 

    Pre-procedure1

    • Remove the OIL PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Remove the OIL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      2 (OIL PMP fuse holder) - 3 (OIL PMP relay holder) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      2 (OIL PMP fuse holder) or 3 (OIL PMP relay holder) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      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.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the OIL PMP relay.
    • Install the OIL PMP fuse.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (OIL PMP RELAY - BODY GROUND) 

    Pre-procedure1

    • Remove the OIL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      2 (OIL PMP relay holder) - Body ground Ignition switch off Below 1 Ω Ω
      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.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the OIL PMP relay.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. 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.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      B76-4 (L) - 5 (OIL PMP relay holder) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      B76-4 (L) or 5 (OIL PMP relay holder) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      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.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • 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  8

  8. 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.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      A21-17 (OPM2) - 1 (OIL PMP relay holder) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      A21-17 (OPM2) or 1 (OIL PMP relay holder) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
      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.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Install the OIL PMP relay.
    • Reconnect the hybrid vehicle control ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY - BODY GROUND) 

    Pre-procedure1

    • Disconnect the oil pump with motor assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B76-1 (OPG) - Body ground Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the oil pump with motor assembly connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connector.
    • Disconnect the oil pump with motor assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      A21-15 (NOPM) - B76-2 (NOPM) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      A21-15 (NOPM) or B76-2 (NOPM) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the oil pump with motor assembly connector.
    • Reconnect the hybrid vehicle control ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP WITH MOTOR ASSEMBLY) 

    Pre-procedure1

    • Disconnect the hybrid vehicle control ECU connector.
    • Disconnect the oil pump with motor assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      A21-3 (OPM1) - B76-3 (OPM1) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      A21-3 (OPM1) or B76-3 (OPM1) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ
    • Connect the cable to the negative (-) auxiliary battery terminal.
    • 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
      A21-3 (OPM1) or B76-3 (OPM1) - Body ground Ignition switch ON Below 1 V V
      NOTE:

      Turning the ignition switch to ON with the hybrid vehicle control ECU and oil pump with motor assembly connectors 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.
    • Disconnect the cable from the negative (-) auxiliary battery terminal.
    • Reconnect the oil pump with motor assembly connector.
    • Reconnect the hybrid vehicle control ECU connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. PERFORM ACTIVE TEST USING GTS (CONTROL THE MOTOR/GENERATOR COOLING OIL PUMP) 

    Pre-procedure1

    • Set the Duty ratio to 90%.

      HINT: 

      The active test is not performed when the Duty ratio is 50% or lower or 95% or higher, or the ambient temperature is 0°C (32°F) or lower.

      Powertrain > Hybrid Control > Active Test 

      Active Test Display
      Control the Motor/Generator Cooling Oil Pump
      Data List Display
      Motor/Generator Cooling Oil Pump Motor Revolution
    • Check the oil pump with motor is speed.

      Result

      Result Proceed to
      The value of Motor/Generator Cooling Oil Pump Motor Revolution is between 260 and 7000 rpm A
      None of the above conditions are met B

    Post-procedure1

    • None.

    Result: 

    A 

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

    Result: 

    B 

    REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [08/2023 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

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