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

WIRING DIAGRAM

PROCEDURE

1.

CHECK CHARGING SYSTEM

(a) Check the charging system.

Click here

NG

REPAIR OR REPLACE CHARGING SYSTEM
OK

2.

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

(a) Disconnect the C63 ECM connector.

(b) Disconnect the C37 generator assembly connector.

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

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
OK

REPLACE GENERATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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