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Heater Water Pump Circuit [11/2016 - ]: Procedure

  1. INSPECT WATER PUMP RELAY 
    GTY430351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Water Pump Relay)
    1. Remove the water pump relay from the No. 3 engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

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

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE WATER PUMP RELAY. Refer to  PARTS LOCATION [11/2016 - ] 

    Result:  1

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (A/C W/P FUSE - WATER PUMP RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1 (A/C W/PMP Relay) - Body ground Power switch on (IG) 11 to 14 V
      3 (A/C W/PMP Relay) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - POWER SOURCE) 
    1. Reinstall water pump relay to the No. 3 engine room relay block.
    2. Disconnect the A85 hybrid vehicle control ECU assembly connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A85-32 (WP) - Body ground Power switch off Below 1 V
      A85-32 (WP) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  4

  4. INSPECT HEATER WATER PUMP ASSEMBLY 
    1. Remove the heater water pump assembly.

      Refer to REMOVAL [11/2016 - ]

    2. Inspect the heater water pump assembly.

      Refer to INSPECTION [11/2016 - ]

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE HEATER WATER PUMP ASSEMBLY. Refer to  REMOVAL [11/2016 - ] 

    Result:  1

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (HEATER WATER PUMP ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A37-1 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (HEATER WATER PUMP ASSEMBLY - NO. 3 ENGINE ROOM RELAY BLOCK) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A37-2 - 5 (A/C W/PMP Relay) Always Below 1 Ω
      A37-2 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2016 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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