Toyota Tacoma (2015-2018) Service Manual: Lost Communication with Alternator Missing Message (P161A87)

Toyota Tacoma (2015-2018) Service Manual / 2gr-fks 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.	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

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

1.	CHECK CHARGING SYSTEM

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

REPAIR OR REPLACE CHARGING SYSTEM

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

(a) Disconnect the E9 ECM connector.

(b) Disconnect the G2 generator assembly connector.

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

REPLACE GENERATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

On-vehicle Inspection

ON-VEHICLE INSPECTION PROCEDURE 1. CHECK BATTERY CONDITION NOTICE: If the battery is weak or if the engine is difficult to start, recharge the battery and perform inspections again before return ...

Charging Failure

PROCEDURE 1. CHECK GENERATOR PULLEY WITH CLUTCH (ON-VEHICLE INSPECTION) (a) Start the engine and visually check if the fan of the generator rotor assembly located i ...

Other materials:

Event data recorder
This vehicle is equipped with an event data recorder (EDR). The main purpose of an EDR is to record, in certain crash or near crash-like situations, such as an air bag deployment or hitting a road obstacle, data that will assist in understanding how a vehicle’s systems performed. The EDR is ...

Transmission Fluid Temperature Sensor "A" Circuit Low Input (P0712,P0713)
DESCRIPTION The No. 1 ATF temperature sensor converts the fluid temperature into a resistance value for use by the ECM. The ECM applies a voltage to the temperature sensor through terminal THO1 of the ECM. The sensor resistance changes with the ATF temperature. As the temperature becomes hi ...

Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Charging System DTC Code Detection Item Warning Indicate Memory SAE See page P161A87 Lost Communication with Alternator Missing Message - DTC stored ...