DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Stop And Start System - Diagnostic Codes (2 Of 3) >> Stop And Start System >> DTC P2796-12: Electromagnetic Oil Pump Circuit Short to Battery [12/2019 - 10/2022] >> Procedure

DTC P2796-12: Electromagnetic Oil Pump Circuit Short to Battery [12/2019 - 10/2022]: Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2796-12) 
    1. Read the DTCs

      Powertrain > Stop and Start > Trouble Codes 

      Result

      Result Proceed to
      DTC P2796-12 is output A
      DTCs P2796-12 and P323A-19 are output B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE) 
    GTY935867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.

      Result

      Tester Connection Condition Result Proceed to
      H66-8 (EGND) - Body ground Ignition switch ON 10 to 14 V A
      Below 1 V B

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE) 
    GTY935867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Disconnect the transmission wire connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Result

      Tester Connection Condition Result Result
      H66-8 (EGND) - Body ground Ignition switch ON 10 to 14 V A
      Below 1 V B

    Result: 

    B 

    REPLACE TRANSMISSION WIRE 

    1. for 2WD Models:

      Refer to REMOVAL [12/2019 - 10/2022]

    2. for AWD Models:

      Refer to REMOVAL [12/2019 - 10/2022]

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (EGND TERMINAL VOLTAGE) 
    GTY900133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Engine Stop and Start ECU)
    1. Disconnect the engine stop and start ECU connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Result

      Tester Connection Condition Result Proceed to
      H66-8 (EGND) - Body ground Ignition switch ON 10 to 14 V A
      Below 1 V B

    Result: 

    A 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU (EGND) - TRANSMISSION WIRE (EMP-)) 

    Result: 

    B 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

  5. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS) 
    GTY882251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-9 (EMOP) - Other terminals* Always 10 kΩ or higher
      1. *: Except H66-8 (EGND) terminal

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO DTC P323A-19. Refer to  DTC P323A-19: Backup Boost Converter "A" Circuit Current Above Threshold [12/2019 - 10/2022] 

    Result: 

    NG 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - OTHER TERMINALS) 
    GTY882251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Disconnect the transmission wire connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-9 (EMOP) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE 

    1. for 2WD Models:

      Refer to REMOVAL [12/2019 - 10/2022]

    2. for AWD Models:

      Refer to REMOVAL [12/2019 - 10/2022]

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - TRANSMISSION WIRE) 
    1. Disconnect the engine stop and start ECU connector.
    2. Disconnect the transmission wire connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-9 (EMOP) or C51-29 (EMP+) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

Diesel-Data.com