CHARGING SYSTEM, Diagnostic DTC:P161A

DTC Code DTC Name
P161A Lost Communication with Alternator

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

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 or connector

  • Generator assembly

  • ECM

Charge warning does not come on

DTC stored

WIRING DIAGRAM

A340530E30

CAUTION / NOTICE / HINT

Note:

Before replacing the ECM, refer to Service Bulletin.

PROCEDURE

  1. CHECK CHARGING SYSTEM

    1. Check the charging system.

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE CHARGING SYSTEM

    OK

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

    1. Disconnect the B186 ECM connector.

    2. Disconnect the B184 generator assembly connector.

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

      Standard Resistance (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      B186-61 (LIN) - B184-2 (LIN)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      B186-61 (LIN) or B184-2 (LIN) - body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE GENERATOR ASSEMBLY

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR