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

Toyota Yaris XP210 (2020-2024) 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
Neutral Switch	Shift lever is in any position other than neutral	OFF

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

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)

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

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

REPLACE NEUTRAL POSITION SENSOR (NEUTRAL POSITION SWITCH)

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