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DTC P2796-14: Electromagnetic Oil Pump Circuit Open [11/2016 - ]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P279614) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Stop and Start / Trouble Codes.
    5. Read the DTCs

      Powertrain > Stop and Start > Trouble Codes 

      Result Proceed to
      DTC P279614 is output A
      DTCs P279614 and P323A19 are output B

    Result: 

    B 

    See step  10

    Result: 

    A 

    Go to next step 

  2. CHECK ENGINE STOP AND START ECU (EGND TERMINAL WAVEFORM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    3. Turn the Techstream on.
    4. Connect an oscilloscope to the EGND and GND1 terminals of the engine stop and start ECU connectors.
      GTY713646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Engine Stop and Start ECU)      		 - -
    5. Enter the following menus: Powertrain / Stop and Start / Active Test / Electromagnetic Oil Pump.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump
    6. Check the waveform while performing the Active Test.
      Item Condition
      Tester Connection F123-8 (EGND) - A91-8 (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 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 [11/2016 - ] .

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK.  Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] .

    Result: 

    A 

    Go to next step 

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY713648Courtesy 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
      F123-8 (EGND) - Body ground Ignition switch off 10 kΩ or higher
      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    Go to next step 

  4. CHECK TERMINAL VOLTAGE (EMP+ TERMINAL) 
    GTY715638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Transmission Wire)
    1. Disconnect the transmission wire connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Stop and Start / Active Test / Electromagnetic Oil Pump.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C62-29 (EMP+) - Body ground
      • Ignition switch ON (engine is stopped)
      • Active Test "Electromagnetic Oil Pump" being performed
      		 10 to 14 V
      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    Go to next step 

  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
      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    Go to next step 

  6. INSPECT OIL PUMP WITH SOLENOID ASSEMBLY 
    1. Inspect the oil pump with solenoid assembly.
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE 

    Result: 

    NG 

    REPLACE OIL PUMP WITH SOLENOID ASSEMBLY 

  7. CHECK TERMINAL VOLTAGE (EMOP TERMINAL) 
    GTY713645Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Disconnect the transmission wire connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.

      HINT: 

      Do not start the engine.

    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Stop and Start / Active Test / Electromagnetic Oil Pump.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Electromagnetic Oil Pump
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      F123-9 (EMOP) - Body ground
      • Ignition switch ON (engine is stopped)
      • Active Test "Electromagnetic Oil Pump" being performed
      		 10 to 14 V
      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 [11/2016 - ] .

  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
      F123-8 (EGND) - Body ground Always 10 kΩ or higher
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ENGINE STOP AND START ECU.  Refer to REMOVAL [11/2016 - ] .

    Result: 

    NG 

    Go to next step 

  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
      F123-8 (EGND) or C62-28 (EMP-) - Body ground Always 10 kΩ or higher
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY713645Courtesy 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
      F123-9 (EMOP) - Body ground Always 10 kΩ or higher
      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    Go to next step 

  11. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - TRANSMISSION WIRE) 
    GTY710078Courtesy 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
      F123-9 (EMOP) - F123-8 (EGND) 20°C (68°F) 5.0 to 5.6 Ω
      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    Go to next step 

  12. CHECK ENGINE STOP AND START ECU 
    GTY734204Courtesy 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
      F123-9 (EMOP) - F123-8 (EGND) Always 10 kΩ or higher
      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO DTC P323A19.  Refer to DTC P323A-19: Backup Boost Converter "A" Circuit Current Above Threshold [11/2016 - ] .

    Result: 

    NG 

    REPLACE ENGINE STOP AND START ECU.  Refer to REMOVAL [11/2016 - ] .

  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
      F123-8 (EGND) - C62-28 (EMP-) Always Below 1 Ω
      F123-9 (EMOP) - C62-29 (EMP+) Always Below 1 Ω
      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    Go to next step 

  14. INSPECT OIL PUMP WITH SOLENOID ASSEMBLY 
    1. Inspect the oil pump with solenoid assembly.
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE 

    Result: 

    NG 

    REPLACE OIL PUMP WITH SOLENOID ASSEMBLY 

  15. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    GTY713645Courtesy 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
      F123-9 (EMOP) - Body ground Always 10 kΩ or higher
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TRANSMISSION WIRE 

    Result: 

    NG 

    Go to next step 

  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
      F123-9 (EMOP) or C62-29 (EMP+) - Body ground Always 10 kΩ or higher
      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ENGINE STOP AND START ECU.  Refer to REMOVAL [11/2016 - ] .

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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