CHARGING SYSTEM, Diagnostic DTC:P161A87

DTC Code DTC Name
P161A87 Lost Communication with Alternator Missing Message

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 engine switch on (IG).

(1 trip detection logic)

  • Wire harness or connector

  • Generator assembly

  • ECM

WIRING DIAGRAM

A01W2J9E07

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Before replacing the ECM, refer to Service Bulletin.

PROCEDURE


  1. CHECK CHARGING SYSTEM


    1. Check the charging system Click here.


    NG

    REPAIR OR REPLACE CHARGING SYSTEM

    OK

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


    1. Disconnect the D87 ECM connector.

    2. Disconnect the D90 generator assembly connector.

    3. Disconnect the D97 battery state sensor assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D90-2 (LIN) - D87-61 (LIN) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D97-2 (LIN), D90-2 (LIN) or D87-61 (LIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CLEAR DTCS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Check for DTCs, and then write them down.

    5. Clear the DTCs. Click here

    6. Turn the engine switch off, wait 30 seconds.


    NEXT

  4. CHECK FOR DTCS


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Allow the engine to idle for approximately 17 minutes or more.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Trouble Codes.

    6. Check for DTCs. Click here

      Result
      Result Proceed to
      Only DTC P161A87 is output. A
      DTC P161A87 and P162B87 are output. B
      DTCs are not output. C

    A

    REPLACE GENERATOR WITH REGULATOR ASSEMBLY Click here

    B

    REPLACE ECM Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS (FOR SFI SYSTEM) Click here