Toyota Yaris: Stop And Start System / Neutral Position Switch Circuit

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / Stop And Start / Stop And Start System / Neutral Position Switch Circuit

DESCRIPTION

The engine stop and start ECU uses the park/neutral position switch assembly installed to the continuously variable transaxle assembly to detect when the shift lever is in P or N.

WIRING DIAGRAM

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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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  • Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

For wire harness and connector inspection procedures and precautions, refer to " "

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 is in neutral

ON

Shift lever is in any position other than neutral

OFF

OK

GO TO PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

Component with harness connected

(Engine Stop and Start ECU)

-

-

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

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

Ignition switch ON, shift lever in any position other than neutral

0.7 to 1.9 V

OK

GO TO PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE NEUTRAL POSITION SENSOR (NEUTRAL POSITION SWITCH)

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