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

Toyota Yaris XP210 (2020-2022) 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.

    Click here

  • After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).

    Click here

  • 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.

    Click here

  • When the ECM is replaced on a vehicle with a non-specified auxiliary battery, it is necessary to perform auxiliary battery type switching.

    Click here

  • 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.

    Click here

  • 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.

    Click here

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

OK

USE SIMULATION METHOD TO CHECK

NG

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.

(c) Measure the resistance according to the value(s) in the table below.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK ENGINE STOP AND START ECU (TMN TERMINAL VOLTAGE)

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

*a

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

OK

REPLACE ENGINE STOP AND START ECU

NG

REPLACE NEUTRAL POSITION SWITCH

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