Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001KSBS
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [09/2019 - 09/2022]
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P085011; Park/Neutral Switch Circuit Short to Ground; 2020 - 2022 MY Corolla Corolla Hatchback [09/2019 - 09/2022]

DTC

P085011

Park/Neutral Switch Circuit Short to Ground

DESCRIPTION

The neutral position switch detects whether the shift lever is in neutral or not and outputs a signal to the ECM. The neutral position switch is installed to the transaxle and is connected to the ECM via a wire harness.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P085011

Park/Neutral Switch Circuit Short to Ground

Diagnosis condition:

  • Ignition switch ON

Abnormal condition:

  • The neutral position switch output voltage is less than 0.12 V.

Malfunction time:

  • 3 seconds or more

Trip logic:

  • 1 trip detection logic

Detection conditions:

  • Continuous

Sensors/components used for detection:

  • Neutral position switch
  • Short in neutral position switch circuit
  • Neutral position switch
  • ECM

Does not come on

DTC stored

  • SAE Code: P0851
  • DTC for Mexico Models: Does not apply

MONITOR DESCRIPTION

When the ignition switch is turned ON and the output voltage of the neutral position switch is less than 0.12 V for 3 seconds or more, the ECM determines that the neutral position switch circuit is malfunctioning and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components

Neutral position switch

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON [A].
  7. Turn the Techstream on.
  8. Wait 5 seconds or more [B].
  9. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Proceed to the next screen and enter the DTC to be checked.
  13. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system has a malfunction.
    • [A] to [C]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

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.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Neutral Position Switch Output Voltage.

Powertrain > Engine > Data List

Tester Display

Neutral Position Switch Output Voltage

(e) Record the Neutral Position Switch Output Voltage value.

(f) Turn the ignition switch off.

(g) Turn the Techstream off.

(h) Disconnect the neutral position switch connector.

(i) Turn the ignition switch to ON.

(j) Turn the Techstream on.

(k) Enter the following menus: Powertrain / Engine / Data List / Neutral Position Switch Output Voltage.

Powertrain > Engine > Data List

Tester Display

Neutral Position Switch Output Voltage

(l) Compare the Data List value when the connector is connected and when the connector is not connected.

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

B

GO TO STEP 4

A

2.

CHECK TERMINAL VOLTAGE (NEUTRAL POSITION SWITCH)

*a

Front view of wire harness connector

(to Neutral Position Switch)

(a) Disconnect the neutral position switch connector.

(b) Turn the ignition switch to ON.

(c) 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

OK

REPLACE NEUTRAL POSITION SWITCH

NG

3.

CHECK HARNESS AND CONNECTOR (NEUTRAL POSITION SWITCH - ECM)

(a) Disconnect the neutral position switch connector.

(b) Disconnect the ECM connector.

(c) 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

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK TERMINAL VOLTAGE (NEUTRAL POSITION SWITCH)

*a

Front view of wire harness connector

(to Neutral Position Switch)

(a) Disconnect the neutral position switch connector.

(b) Turn the ignition switch to ON.

(c) 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

OK

REPLACE ECM

NG

5.

CHECK HARNESS AND CONNECTOR (NEUTRAL POSITION SWITCH - ECM)

(a) Disconnect the neutral position switch connector.

(b) Disconnect the ECM connector.

(c) 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

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR