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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 P2796-14: Electromagnetic Oil Pump Circuit Open [10/2022 - ] >> Procedure

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

  1. CHECK VEHICLE CONTROL HISTORY 
    1. Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

      Powertrain > Stop and Start > Utility 

      Tester Display
      Vehicle Control History (RoB)
    2. Check vehicle control history.

      Result

      Result Proceed to
      Vehicle control history item BBC Boosting Output Overcurrent stored A
      Vehicle control history item not stored B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY1104561Courtesy 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  7

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - TRANSMISSION WIRE) 
    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  5

    Result: 

    OK 

    See step  4

  4. CHECK ENGINE STOP AND START ECU 
    GTY1104562Courtesy 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 BACKUP BOOST CONVERTER CIRCUIT. Refer to  Backup Boost Converter Circuit [10/2022 - 11/2023]  , or refer to  Backup Boost Converter Circuit [11/2023 - ] 

    Result: 

    NG 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

  5. 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  6

  6. INSPECT TRANSMISSION WIRE (OIL PUMP WITH SOLENOID ASSEMBLY) 
    1. Disconnect the transmission wire connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1052283Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Transmission Wire)

      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 

    REPLACE OIL PUMP WITH SOLENOID ASSEMBLY. Refer to  PROCEDURE - Step 4 

    Result: 

    NG 

    REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [10/2022 - ] 

  7. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY1104559Courtesy 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. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    See step  8

  8. 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 [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      HINT: 

      Do not start the engine.

    2. Turn the GTS on.
    3. Connect an oscilloscope to the EGND and GND1 terminals of the engine stop and start ECU connectors.
      GTY1180970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Engine Stop and Start ECU)      		 - -
    4. 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
      GTY736440Courtesy 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 [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    C 

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

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY1104558Courtesy 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  14

    Result: 

    OK 

    See step  11

  11. CHECK TERMINAL VOLTAGE (EMP+ TERMINAL) 
    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  13

    Result: 

    OK 

    See step  12

  12. INSPECT TRANSMISSION WIRE (OIL PUMP WITH SOLENOID ASSEMBLY) 
    1. Disconnect the transmission wire connector.
      GTY1052283Courtesy 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

  13. CHECK TERMINAL VOLTAGE (EMOP TERMINAL) 
    GTY1108639Courtesy 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 [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

  14. 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 [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    See step  15

  15. 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. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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