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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 164 (Engine Control System (M20A-FKS) - Diagnostic Codes (P0627-P106A)) >> SFI System >> DTC P0850-11: Park/Neutral Switch Circuit Short to Ground [09/2019 - 09/2022] >> Procedure

DTC P0850-11: Park/Neutral Switch Circuit Short to Ground [09/2019 - 09/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ VALUE USING TECHSTREAM (NEUTRAL POSITION SWITCH OUTPUT VOLTAGE) 

    HINT: 

    Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

    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 / Engine / Data List / Neutral Position Switch Output Voltage.

      Powertrain > Engine > Data List 

      Tester Display
      Neutral Position Switch Output Voltage
    5. Record the Neutral Position Switch Output Voltage value.
    6. Turn the ignition switch off.
    7. Turn the Techstream off.
    8. Disconnect the neutral position switch connector.
    9. Turn the ignition switch to ON.
    10. Turn the Techstream on.
    11. Enter the following menus: Powertrain / Engine / Data List / Neutral Position Switch Output Voltage.

      Powertrain > Engine > Data List 

      Tester Display
      Neutral Position Switch Output Voltage
    12. Compare the Data List value when the connector is connected and when the connector is not connected.

      Result

      Result Proceed to
      The value of Neutral Position Switch Output Voltage changes A
      The value of Neutral Position Switch Output Voltage does not change B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  2

  2. CHECK TERMINAL VOLTAGE (NEUTRAL POSITION SWITCH) 
    GTY943539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Neutral Position Switch)
    1. Disconnect the neutral position switch connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C63-1 (W1) - Body ground Ignition switch ON 4.5 to 5.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NEUTRAL POSITION SWITCH. Refer to  REMOVAL [01/2019 - 11/2022] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (NEUTRAL POSITION SWITCH - ECM) 
    1. Disconnect the neutral position switch connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C63-1 (W1) - C76-83 (VCNP) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK TERMINAL VOLTAGE (NEUTRAL POSITION SWITCH) 
    GTY916887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Neutral Position Switch)
    1. Disconnect the neutral position switch connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C63-2 (TMN) - Body ground Ignition switch ON 3.0 to 5.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (NEUTRAL POSITION SWITCH - ECM) 
    1. Disconnect the neutral position switch connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C63-2 (TMN) or C76-106 (NPSW) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [03/2019 - 09/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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