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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Electrical >> Starter >> Stop And Start System - Diagnostic Codes (2 Of 3) >> Stop And Start System >> DTC P2796-14: Electromagnetic Oil Pump Circuit Open [12/2019 - 10/2022] >> Procedure

DTC P2796-14: Electromagnetic Oil Pump Circuit Open [12/2019 - 10/2022]: Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2796-14) 
    1. Read the DTCs

      Powertrain > Stop and Start > Trouble Codes 

      Result

      Result Proceed to
      DTC P2796-14 is output A
      DTCs P2796-14 and P323A-19 are output B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. CHECK ENGINE STOP AND START ECU (EGND TERMINAL WAVEFORM) 
    1. Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    2. Connect an oscilloscope to the EGND and GND1 terminals of the engine stop and start ECU connectors.
      GTY882252Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Engine Stop and Start ECU)      		 - -
    3. Check the waveform while performing the Active Test.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump
      Item Condition
      Tester Connection H66-8 (EGND) - A33-8 (GND1)
      Tool Setting 10 V/DIV., 20 ms./DIV.
      Condition
      • Ignition switch ON (engine is stopped)
      • Active Test "Electromagnetic Oil Pump" being performed
      GTY862701Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard

      The waveform is similar to that shown in the illustration.

      Result

      Result Proceed to
      Constant value below 1 V A
      Constant value between 10 to 14 V B
      Waveform output as in illustration C

    Result: 

    B 

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

    Result: 

    C 

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

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY935867Courtesy 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
      H66-8 (EGND) - Body ground Ignition switch off 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  4

  4. CHECK TERMINAL VOLTAGE (EMP+ TERMINAL) 
    GTY932342Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Transmission Wire)
    1. Disconnect the transmission wire connector.
    2. Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    3. Measure the voltage according to the value(s) in the table below.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump

      Standard Voltage

      Tester Connection Condition Specified Condition
      C51-29 (EMP+) - Body ground
      • Ignition switch ON (engine is stopped)
      • Active Test "Electromagnetic Oil Pump" being performed
      		 10 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. INSPECT TRANSMISSION WIRE (OIL PUMP WITH SOLENOID ASSEMBLY) 
    1. Disconnect the transmission wire connector.
      GTY713603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Wire)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      29 (EMP+) - 28 (EMP-) 20°C (68°F) 5.0 to 5.6 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    See step  6

  6. INSPECT OIL PUMP WITH SOLENOID ASSEMBLY 
    1. for 2WD Models:

      Refer to PROCEDURE - Step 5

    2. for AWD Models:

      Refer to PROCEDURE - Step 5

    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 

    REPLACE OIL PUMP WITH SOLENOID ASSEMBLY 

    1. for 2WD Models:

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

    2. for AWD Models:

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

  7. CHECK TERMINAL VOLTAGE (EMOP TERMINAL) 
    GTY882251Courtesy 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.

      HINT: 

      Do not start the engine.

    3. Measure the voltage according to the value(s) in the table below.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump

      Standard Voltage

      Tester Connection Condition Specified Condition
      H66-9 (EMOP) - Body ground
      • Ignition switch ON (engine is stopped)
      • Active Test "Electromagnetic Oil Pump" being performed
      		 10 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

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

  8. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    1. Disconnect the engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-8 (EGND) - Body ground 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 

    See step  9

  9. 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 Result
      H66-8 (EGND) or C51-28 (EMP-) - Body ground 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 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    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) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - TRANSMISSION WIRE) 
    GTY900132Courtesy 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. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-9 (EMOP) - H66-8 (EGND) 20°C (68°F) 5.0 to 5.6 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  12

  12. CHECK ENGINE STOP AND START ECU 
    GTY852848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Disconnect the engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-9 (EMOP) - H66-8 (EGND) Always 10 kΩ or higher

      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 

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

  13. 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
      H66-8 (EGND) - C51-28 (EMP-) Always Below 1 Ω
      H66-9 (EMOP) - C51-29 (EMP+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. INSPECT OIL PUMP WITH SOLENOID ASSEMBLY 
    1. for 2WD Models:

      Refer to PROCEDURE - Step 5

    2. for AWD Models:

      Refer to PROCEDURE - Step 5

    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 

    REPLACE OIL PUMP WITH SOLENOID ASSEMBLY 

    1. for 2WD Models:

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

    2. for AWD Models:

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

  15. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    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) - Body ground 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  16

  16. 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+) - Body ground 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 

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