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Toyota Tacoma (2015-2018) Service Manual / 2gr-fks Charging / Charging System / Lost Communication with Alternator Missing Message (P161A87)

Toyota Tacoma (2015-2018) Service 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.

DTC Detection Condition

Trouble Area

P161A87

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

PROCEDURE

1.

CHECK CHARGING SYSTEM

(a) Check the charging system (See page ).

NG

REPAIR OR REPLACE CHARGING SYSTEM
OK

2.

CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY)

(a) Disconnect the E9 ECM connector.

(b) Disconnect the G2 generator assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E9-34 (LIN) - G2-2 (LIN)

Always

Below 1 Ω

E9-34 (LIN) or G2-2 (LIN) - Body ground

Always

10 kΩ or higher
OK

REPLACE GENERATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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