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Home >> Toyota >> 2015 >> Avalon Hybrid Limited >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> SFI System - Diagnostic Codes - (Hybrid) (2 Of 4) >> SFI System >> DTC P261B: Engine Coolant Pump "B" Control Malfunction; DTC P261C: Engine Coolant Pump "B" Control Circuit Low; DTC P261D: Engine Coolant Pump "B" Control Circuit High [10/2014 - ] >> Procedure

DTC P261B: Engine Coolant Pump "B" Control Malfunction; DTC P261C: Engine Coolant Pump "B" Control Circuit Low; DTC P261D: Engine Coolant Pump "B" Control Circuit High [10/2014 - ]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE ELECTRIC WATER PUMP) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Electric Water Pump.
    5. Touch the engine water pump and check that the pump assembly is operating (vibrating).

      OK

      The engine water pump assembly is operating (vibrating).

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY - ECM) 

    HINT: 

    Confirm a good connection at the engine water pump assembly and ECM connectors.

    1. Disconnect the engine water pump assembly connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B59-2 (NWP) - A18-28 (WPI) Always Below 1 Ω
      B59-1 (SWP) - A18-29 (WPO) Always Below 1 Ω
      B59-2 (NWP) or A18-28 (WPI) - Body ground Always 10 kΩ or higher
      B59-1 (SWP) or A18-29 (WPO) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK TERMINAL VOLTAGE (WPI VOLTAGE) 
    GTY572413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the engine water pump assembly connector.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      B59-2 (NWP) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Engine Water Pump Assembly)

    Result: 

    OK 

    REPLACE ENGINE WATER PUMP ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [10/2014 - ] )

  4. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY) 
    GTY610677Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

    Confirm a good connection at the engine water pump assembly and ECM connectors.

    1. Disconnect the engine water pump assembly connector.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      B59-3 (+B) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Engine Water Pump Assembly)

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY - BODY GROUND) 
    1. Disconnect the engine water pump assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B59-4 (PGND) - Body ground Always Below 1 Ω

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY - ECM) 
    1. Disconnect the engine water pump assembly connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      B59-2 (NWP) - A18-28 (WPI) Always Below 1 Ω
      B59-1 (SWP) - A18-29 (WPO) Always Below 1 Ω
      B59-2 (NWP) or A18-28 (WPI) - Body ground Always 10 kΩ or higher
      B59-1 (SWP) or A18-29 (WPO) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. REPLACE ENGINE WATER PUMP ASSEMBLY 
    1. Replace the engine water pump assembly (Refer to REMOVAL [10/2014 - ] ).

    Result: 

    NEXT 

    See step  8

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P261B, P261C OR P261D) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] )
    5. Turn the power switch off and wait for at least 30 seconds.
    6. Turn the power switch on (IG).
    7. Turn the Techstream on.
    8. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    10. Read the DTCs.
      RESULT

      Result Proceed to
      DTC P261B, P261C or P261D is output A
      DTCs are not output B

    Result: 

    A 

    REPLACE ECM 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    B 

    END 

  9. INSPECT RELAY (ENG W/PMP RELAY) 
    GTY319528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ENG W/PMP relay from the engine room relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 No auxiliary battery voltage applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω

    Result: 

    NG 

    REPLACE RELAY (ENG W/PMP RELAY) 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (ENG W/PMP RELAY - ENGINE WATER PUMP ASSEMBLY) 
    1. Remove the ENG W/PMP relay from the engine room relay block and junction block assembly.
    2. Disconnect the engine water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      ENG W/PMP relay terminal 5 - B59-3 (+B) Always Below 1 Ω
      ENG W/PMP relay terminal 5 or B59-3 (+B) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENG W/PMP RELAY) 
    GTY476810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ENG W/PMP relay from the engine room relay block and junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      ENG W/PMP relay terminal 3 - Body ground Always 11 to 14 V
      TEXT IN ILLUSTRATION

      *1 Engine Room Relay Block and Junction Block Assembly
      *2 ENG W/PMP Relay

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (ENG W/PMP RELAY - BODY GROUND) 
    1. Remove the ENG W/PMP relay from the engine room relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      ENG W/PMP relay terminal 2 - Body ground Always Below 1 Ω

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENG W/PMP RELAY - EFI MAIN RELAY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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