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Home >> Toyota >> 2005 >> Prius >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (SFI) - Diagnostics >> DTC P2601: Coolant Pump Control Circuit Range/Performance >> Inspection Procedure >> Hand-held tester:

Hand-held tester:

  1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P2601) 
    1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    2. Turn the power switch ON (IG).
    3. Turn the hand-held tester ON.
    4. On the hand-held tester, select the item: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES.
    5. Read DTCs using the hand-held tester or the OBD II scan tool.

      Result: 

      SCAN TOOL VALUES DESCRIPTION

      Display (DTC output) Proceed to
      P2601 A
      P2601 and other DTCs B

      HINT:

      If any other codes besides P2601 are output, perform troubleshooting for those DTCs first.

    1. B: GO TO RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 
    2. A: GO TO NEXT STEP 
  2. PERFORM ACTIVE TEST BY HAND-HELD TESTER (OPERATE WATER PUMP) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the power switch ON (IG).
    3. Turn the hand-held tester ON.
    4. On the hand-held tester, select the item: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/WATER PUMP.
    5. Check that the CHS W/P relay operates and the operating sounds of the water pump occurs.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

      Tester operation Specified Condition
      WATER PUMP ON CHS W/P relay and water pump operates
    1. NG: Go to step   5 . 
    2. OK: GO TO NEXT STEP 
  3. INSPECT TEMPERATURE SENSOR (CHS TANK OUTLET TEMPERATURE SENSOR) 
    1. Remove the coolant heat storage (CHS) tank outlet temperature sensor.
    2. Measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

      Tester Connection Specified Condition
      1 - 2 2 to 3 kΩ at 20°C (68°F)
      1 - 2 0.2 to 0.4 kΩ at 80°C (176°F)
      NOTE: In case of checking the CHS tank outlet temperature sensor in the water, be careful not to allow water to contact the terminals. After checking, dry the sensor. 

      HINT:

      Alternate procedure: Connect an ohmmeter to the installed CHS tank outlet temperature sensor and read the resistance. Use an infrared thermometer to measure the CHS tank outlet temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine coolant temperature (warm up or allow to cool down) and repeat the test.

    3. Reinstall the CHS tank outlet temperature sensor.
      Fig 1: Inspecting Temperature Sensor
      G02619644Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE TEMPERATURE SENSOR 
    2. OK: GO TO NEXT STEP 
  4. CHECK HARNESS AND CONNECTOR (ECM - CHS TANK OUTLET TEMPERATURE SENSOR) 
    1. Check the harness and the connectors between the CHS tank outlet temperature sensor connector and the ECM connector.
      1. Disconnect the C19 CHS tank outlet temperature sensor connector.
      2. Disconnect the E5 and E7 ECM connectors.
      3. Check the resistance between the wire harness side connectors.

        Standard (Check for open): 

        TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

        Tester Connection Specified Condition
        CHS tank outlet temperature sensor (C19-2) - THW2 (E7-33) Below 1 Ω
        CHS tank outlet temperature sensor (E2-1) - E2 (E4-28) Below 1 Ω
        Fig 2: Identifying C19 CHS Tank Outlet Temperature Sensor Connector Terminals
        G02619645Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard (Check for short): 

        TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

        Tester Connection Specified Condition
        CHS tank outlet temperature sensor (C19-2) or THW2 (E7-33)-Body ground 10 kΩ higher
      4. Reconnect the CHS tank outlet temperature sensor connector.
      5. Reconnect the ECM connectors.
        Fig 3: Identifying E5 And E7 ECM Connectors Terminals
        G02619646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 

      REPLACE ECM (See  ECM (1NZ-FXE)  ) 

  5. INSPECT CHS W/P RELAY (CHS WATER PUMP RELAY) 
    1. Remove the CHS W/P relay from the engine room R/B No.2.
    2. Inspect the CHS W/P relay.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (Apply battery voltage to terminals 1 and 2)
    3. Reinstall the CHS W/P relay.
      Fig 4: Inspecting CHS W/P Relay (CHS Water Pump Relay)
      G02619647Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE CHS W/P RELAY 
    2. OK: GO TO NEXT STEP 
  6. INSPECT WATER W/MOTOR & BRACKET PUMP ASSY 
    1. Disconnect the C20 CHS water pump connector.
    2. Measure the resistance between the terminals of the water pump.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

      Tester Connection Specified Condition
      1 - 2 0.3 to 100 Ω
    3. Reconnect the CHS water pump connector.
      Fig 5: Identifying CHS Water Pump Connector Terminals
      G02619648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE WATER W/MOTOR & BRACKET PUMP ASSY 
    2. OK: GO TO NEXT STEP 
  7. CHECK HARNESS AND CONNECTOR (ECM - CHS W/P RELAY, CHS W/P RELAY - WATER PUMP, WATER PUMP - GROUND) 
    1. Check the harness and the connectors between the CHS water pump connector and the ECM connector.
      1. Remove the CHS W/P relay from the engine room R/B No.2.
      2. Disconnect the E7 ECM connector.
      3. Check the resistance between the wire harness side connectors.

        Standard (Check for open): 

        TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

        Tester Connection Specified Condition
        WPL (E7-15) - CHS W/P relay (2) Below 1 Ω
        Fig 6: Identifying CHS Water Pump Connector Terminals
        G02619649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard (Check for short): 

        TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

        Tester Connection Specified Condition
        CHS W/P relay (2) or WPL (E7-15) - Body ground 10 kΩ or higher
      4. Reinstall the integration relay.
      5. Reconnect the ECM connector.
    2. Check the harness and the connectors between the CHS water pump connector and the CHS W/P relay.
      1. Disconnect the CHS water pump connector.
      2. Remove the CHS W/P relay from the engine room R/B No.2.
      3. Check the resistance between the wire harness side connectors.
        Fig 7: Identifying E7 ECM Connector Terminals
        G02619650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard (Check for open): 

        TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

        Tester Connection Specified Condition
        CHS water pump (2) - CHS W/P relay (5) Below 1 Ω
        CHS water pump (1) - Body ground Below 1 Ω
        Fig 8: Identifying CHS W/P Relay Location
        G02619651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard (Check for short): 

        TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION

        Tester Connection Specified Condition
        CHS water pump (2) or CHS W/P relay (5) - Body ground 10 kΩ or higher
      4. Reconnect the CHS water pump connector.
      5. Reinstall the integration relay.
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 

      REPLACE ECM (See  ECM (1NZ-FXE)  ) 

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