M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P085011; Park/Neutral Switch Circuit Short to Ground; 2020 - 2022 MY Corolla Corolla Hatchback [09/2019

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.

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

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.
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When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON [A].
Turn the Techstream on.
Wait 5 seconds or more [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Proceed to the next screen and enter the DTC to be checked.

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

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

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

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

Powertrain > Engine > Data List

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

Powertrain > Engine > Data List

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