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

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
  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) 
    GTY1129715Courtesy 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
      C36-9 (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
      C36-9 (EMOP) - C36-8 (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.
      GTY1254214Courtesy 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
      C36-9 (EMOP) - C36-8 (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 [10/2022 - ] 

    Result: 

    NG 

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

  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
      C36-8 (EGND) - B25-28 (EMP-) Always Below 1 Ω Ω
      C36-9 (EMOP) - B25-29 (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 4 

    Result: 

    NG 

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

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

    Pre-procedure1

    • Disconnect the transmission wire connector.
    • Measure the resistance according to the value(s) in the table below.
      GTY1132934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Engine Stop and Start ECU)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C36-9 (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 [10/2022 - ] 

    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
      C36-9 (EMOP) or B25-29 (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 [10/2022 - ] 

    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.

    • Turn the GTS on.
    • Connect an oscilloscope to the EGND and GND1 terminals of the engine stop and start ECU connectors.
      GTY1132939Courtesy 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 C36-8 (EGND) - A24-8 (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 [10/2022 - ] 

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY1132936Courtesy 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
      C36-8 (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
      B25-29 (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 [10/2022 - ] 

    Result: 

    NG 

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

  14. CHECK TERMINAL VOLTAGE (EMOP 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.
      GTY1132937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Engine Stop and Start ECU)      		 - -

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C36-9 (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 [10/2022 - ] 

  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
      C36-8 (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 [10/2022 - ] 

    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
      C36-8 (EGND) or B25-28 (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 [10/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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