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

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / 2gr-fks Battery / Charging / Charging System / 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)
  • Wire harness and connector
  • Generator assembly
  • ECM

Charge warning is not displayed

DTC stored

SAE Code: P161A

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 ASSEMBLY)

(a) Disconnect the C56 ECM connector.

(b) Disconnect the C57 generator assembly connector.

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

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
OK

REPLACE GENERATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    On-vehicle Inspection

    Parts Location

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