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Home >> Lexus >> 2024 >> TX 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Stop And Start System - Diagnostic Codes >> Stop And Start System >> DTC P2796-14: Electromagnetic Oil Pump Circuit Open [09/2023 - ] >> Procedure

DTC P2796-14: Electromagnetic Oil Pump Circuit Open [09/2023 - ]: Procedure

  1. CHECK VEHICLE CONTROL HISTORY 

    Pre-procedure1

    • Enter the following menus: Powertrain / Stop and Start / Utility / Vehicle Control History (RoB).

      Powertrain > Stop and Start > Utility 

      Tester Display
      Vehicle Control History (RoB)
    • 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

    Post-procedure1

    • None.

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY1234091Courtesy 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 Result
      D26-9 (EMOP) - Body ground Always 10 kΩ or higher kΩ

      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) 

    Pre-procedure1

    • Disconnect the engine stop and start ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D26-9 (EMOP) - D26-8 (EGND) 20°C (68°F) 5.0 to 5.6 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK ENGINE STOP AND START ECU 

    Pre-procedure1

    • Disconnect the engine stop and start ECU connector.
      GTY1232474Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Engine Stop and Start ECU)      		 - -
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D26-9 (EMOP) - D26-8 (EGND) Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

    GO TO BACKUP BOOST CONVERTER CIRCUIT. Refer to  Backup Boost Converter Circuit [09/2023 - ] 

    Result: 

    NG 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [09/2023 - ] 

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

    Pre-procedure1

    • Disconnect the engine stop and start ECU connector.
    • Disconnect the transmission wire connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D26-8 (EGND) - C24-28 (EMP-) Always Below 1 Ω Ω
      D26-9 (EMOP) - C24-29 (EMP+) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. INSPECT TRANSMISSION WIRE (OIL PUMP WITH SOLENOID ASSEMBLY) 

    Pre-procedure1

    • Disconnect the transmission wire connector.
    • 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 Result
      29 (EMP+) - 28 (EMP-) 20°C (68°F) 5.0 to 5.6 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

    REPLACE OIL PUMP WITH SOLENOID ASSEMBLY. Refer to  PROCEDURE - Step 3 

    Result: 

    NG 

    REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [09/2023 - ] 

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

    Pre-procedure1

    GTY1234090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    • Disconnect the transmission wire connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D26-9 (EMOP) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  8

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

    Pre-procedure1

    • Disconnect the engine stop and start ECU connector.
    • Disconnect the transmission wire connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D26-9 (EMOP) or C24-29 (EMP+) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK ENGINE STOP AND START ECU (EGND TERMINAL WAVEFORM) 

    Pre-procedure1

    • Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    • Connect an oscilloscope to the EGND and GND1 terminals of the engine stop and start ECU connectors.
      GTY1234093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Engine Stop and Start ECU)      		 - -
    • Check the waveform while performing the Active Test.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump
      Item Condition
      Tester Connection D26-8 (EGND) - B24-8 (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

    Post-procedure1

    • None.

    Result: 

    B 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY1234092Courtesy 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 Result
      D26-8 (EGND) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  11

  11. CHECK TERMINAL VOLTAGE (EMP+ TERMINAL) 

    Pre-procedure1

    • Disconnect the transmission wire connector.
    • Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    • 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 Result
      C24-29 (EMP+) - Body ground
      • Ignition switch ON (engine is stopped)
      • Active Test "Electromagnetic Oil Pump" being performed
      		 10 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  12

  12. INSPECT TRANSMISSION WIRE (OIL PUMP WITH SOLENOID ASSEMBLY) 

    Pre-procedure1

    • Disconnect the transmission wire connector.
    • 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 Result
      29 (EMP+) - 28 (EMP-) 20°C (68°F) 5.0 to 5.6 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

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

    Result: 

    NG 

    See step  13

  13. INSPECT OIL PUMP WITH SOLENOID ASSEMBLY 
    1. Inspect the oil pump with solenoid assembly.

      Refer to PROCEDURE - Step 5

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPLACE OIL PUMP WITH SOLENOID ASSEMBLY. Refer to  PROCEDURE - Step 3 

  14. CHECK TERMINAL VOLTAGE (EMOP TERMINAL) 

    Pre-procedure1

    GTY1234080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    • Disconnect the transmission wire connector.
    • Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    • 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 Result
      D26-9 (EMOP) - Body ground
      • Ignition switch ON (engine is stopped)
      • Active Test "Electromagnetic Oil Pump" being performed
      		 10 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    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 [09/2023 - ] 

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

    Pre-procedure1

    • Disconnect the engine stop and start ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D26-8 (EGND) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  16

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

    Pre-procedure1

    • Disconnect the engine stop and start ECU connector.
    • Disconnect the transmission wire connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      D26-8 (EGND) or C24-28 (EMP-) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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