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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 P2601-780 Coolant Pump Control Circuit Range / Performance >> 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.
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. INSPECT OIL PUMP RELAY 
    1. Remove the oil pump relay from the engine room R/B No. 4.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      OIL PUMP RELAY

      Tester Connection Specified Condition
      1 - 2 Below 1 Ω
      3 - 5 10 kΩ or higher
      Below 1 Ω (Apply battery voltage between terminals 1 and 2)
      Fig 1: Inspecting Oil Pump Relay
      G04112307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE OIL PUMP RELAY 

    OK: GO TO NEXT STEP 

  2. REPAIR OR REPLACE HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP RELAY) 
    1. Remove the OIL PUMP relay from the engine room R/B No. 4.
    2. Disconnect the H34 HV control ECU connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      HV CONTROL ECU - OIL PUMP RELAY (VOLTAGE)

      Tester Connection Specified Value
      OPM2 (H34-5)-Engine room R/B No. 4 OIL PUMP relay terminal 2 Below 1 V
    4. Turn the ignition switch off.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      HV CONTROL ECU - OIL PUMP RELAY (CHECK FOR OPEN)

      Tester Connection Specified Condition
      OPM2 (H34-5)-Engine room R/B No. 4 OIL PUMP relay terminal 2 Below 1 Ω

      Standard Resistance (Check for short) 

      HV CONTROL ECU - OIL PUMP RELAY (CHECK FOR SHORT)

      Tester Connection Specified Condition
      OPM2 (H34-5) or Engine room R/B No. 4 OIL PUMP relay terminal 2 - Body ground 10 kΩ or higher
      Fig 2: Repairing Or Replacing Harness And Connector (HV Control ECU - Oil Pump)
      G04112308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  3. INSPECT HYBRID VEHICLE CONTROL ECU 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      HYBRID VEHICLE CONTROL ECU

      Tester Connection Specified Condition
      OPM2 (H34-5) - +B1 (H34-2) and +B1 (H34-1) 10 kΩ or higher
      Fig 3: Inspecting Hybrid Vehicle Control ECU
      G04112309Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HYBRID VEHICLE CONTROL ECU 

    OK: GO TO NEXT STEP 

  4. 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 / INSPECTION MODE 1.
    4. Put the vehicle into the READY-on state and turn on the oil pump relay (activate the oil pump w/ motor assembly).
    5. Exit INSPECTION MODE 1 and turn the ignition switch off.
    6. Repeat the above four steps to turn the oil pump relay on and off.

      Result: 

      The symptom is reproduced. (DTC P2601-780 is output.) 

    NG: CHECK FOR INTERMITTENT PROBLEM 

    OK: REPLACE OIL PUMP W/ MOTOR ASSEMBLY 

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