Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with Alternator Missing Message (P161A87)

DESCRIPTION

The ECM communicates with the generator assembly via LIN communication. If a LIN communication error is detected, the ECM stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

Note

P161A87

Lost Communication with Alternator Missing Message

Generator assembly or ECM communication stops for approximately 17 minutes or more with the engine switch on (IG).

(1 trip detection logic)

Charge warning is not displayed

DTC stored

SAE Code: P161A

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 ASSEMBLY)

(a) Disconnect the C56 ECM connector.

(b) Disconnect the C57 generator assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C56-135 (LIN) - C57-2 (LIN)	Always	Below 1 Ω
C56-135 (LIN) or C57-2 (LIN) - Body ground	Always	10 kΩ or higher

REPLACE GENERATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Electronically Controlled Brake System(for Gasoline Model): System Diagram
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Toyota Avalon (XX50) 2019-2022 Owners Manual