Toyota Yaris: Stop And Start System / Park/Neutral Switch Circuit Short to Ground (P085011,P085015)

Toyota Yaris XP210 (2020-2023) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / Park/Neutral Switch Circuit Short to Ground (P085011,P085015)

DESCRIPTION

The engine stop and start ECU detects a malfunction by comparing the shift position signal with the neutral position switch signal input state. If a malfunction is detected, the engine stop and start ECU blinks the stop and start cancel indicator light, prohibits the stop and start control and stores DTC P085011 or P085015.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Memory	Note
P085011	Park/Neutral Switch Circuit Short to Ground	The following condition continues for 1 second or more (1 trip detection logic) Short in neutral position switch circuit.	Neutral position switch Engine stop and start ECU ECM Wire harness or connector	Blinking	DTC stored	SAE Code: P0851
P085015	Park/Neutral Switch Circuit Short to Battery or Open	The following condition continues for 1 second or more (1 trip detection logic) Open or short in neutral position switch circuit.	Neutral position switch Engine stop and start ECU ECM Wire harness or connector	Blinking	DTC stored	SAE Code: P0852

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.
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After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).
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After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.
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When the ECM is replaced on a vehicle with a non-specified auxiliary battery, it is necessary to perform auxiliary battery type switching.
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Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.
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For wire harness and connector inspection procedures and precautions, refer to
DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.
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PROCEDURE

1.	READ VALUE USING GTS (NEUTRAL SWITCH)

Powertrain > Stop and Start > Data List

Tester Display
Neutral Switch

(a) Read the value when the shift lever is in neutral and any other position.

OK:

Tester Display	Condition	Normal Condition
Neutral Switch	Shift lever in neutral	ON
Neutral Switch	Shift lever in any position other than neutral	OFF

USE SIMULATION METHOD TO CHECK

2.	CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - NEUTRAL POSITION SWITCH)

(a) Disconnect the A67 engine stop and start ECU connector.

(b) Disconnect the D44 neutral position switch connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A67-26 (TMVC) - D44-1 (W1)	Always	Below 1 Ω
A67-25 (TME2) - D44-3 (F+)	Always	Below 1 Ω
A67-8 (TMN) - D44-2 (TMN)	Always	Below 1 Ω
A67-26 (TMVC) - Body ground and other terminals	Always	10 kΩ or higher
D44-1 (W1) - Body ground and other terminals	Always	10 kΩ or higher
A67-25 (TME2) - Body ground and other terminals	Always	10 kΩ or higher
D44-3 (F+) - Body ground and other terminals	Always	10 kΩ or higher
A67-8 (TMN) - Body ground and other terminals	Always	10 kΩ or higher
D44-2 (TMN) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK ENGINE STOP AND START ECU (TMN TERMINAL VOLTAGE)

(a) Measure the voltage according to the value(s) in the table below.

Component with harness connected

(Engine Stop and Start ECU)

Standard Voltage:

Tester Connection	Condition	Specified Condition
A67-8 (TMN) - A67-25 (TME2)	Ignition switch ON, shift lever in neutral	2.7 to 4.3 V
A67-8 (TMN) - A67-25 (TME2)	Ignition switch ON, shift lever in any position other than neutral	0.7 to 1.9 V

REPLACE ENGINE STOP AND START ECU

REPLACE NEUTRAL POSITION SWITCH

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