Toyota CH-R Service Manual: Lost Communication with Alternator (P161A)

Toyota CH-R Service Manual / 3zr-fae Battery / Charging / Charging System / Lost Communication with Alternator (P161A)

DESCRIPTION

The ECM and generator assembly detect reception errors respectively.

The generator assembly reception error detected by the generator assembly is sent to the ECM via LIN communication. If an error occurs in the ECM or generator assembly, the ECM determines there is a LIN communication error and stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P161A	Lost Communication with Alternator	Generator assembly or ECM communication stop for about 17 minutes or more with the ignition switch ON. (1 trip detection logic)	Wire harness and connector Generator assembly ECM

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P161A

Lost Communication with Alternator

Generator assembly or ECM communication stop for about 17 minutes or more with the ignition switch ON.

(1 trip detection logic)

Wire harness and connector
Generator assembly
ECM

WIRING DIAGRAM

PROCEDURE

1.	CHECK CHARGING SYSTEM

(a) Check the charging system.

Click here

REPAIR OR REPLACE CHARGING SYSTEM

2.	CHECK HARNESS AND CONNECTOR (ECM - GENERATOR WITH REGULATOR ASSEMBLY)

(a) Disconnect the C63 ECM connector.

(b) Disconnect the C37 generator assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C63-61 (LIN) - C37-2 (LIN)	Always	Below 1 Ω
C63-61 (LIN), C37-2 (LIN) - body ground	Always	10 kΩ or higher

REPLACE GENERATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

On-vehicle Inspection

ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT NOTICE: If the battery is weak or if the engine is difficult to start, recharge the battery and perform inspections again before returning the vehicl ...

Charging Failure

PROCEDURE 1. CHECK GENERATOR PULLEY WITH CLUTCH (ON-VEHICLE INSPECTION) (a) Start the engine and visually check that the generator rotor assembly (fan) in the gener ...

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