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. 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 ignition switch ON

(1 trip detection logic)

  • Wire harness or connector

  • Generator assembly

  • ECM

 Charge warning light does not come on DTC stored SAE Code: P161A

WIRING DIAGRAM

A001UKWE82
A001SD0E16
*a w/o Battery Current Sensor
*b Generator Assembly
*c LIN Communication Line

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

      Result
      Result Proceed to
      OK (w/ Battery Current Sensor) A
      OK (w/o Battery Current Sensor) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (ECM - GENERATOR ASSEMBLY) Click here

    C

    REPAIR OR REPLACE CHARGING SYSTEM

    A

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


    1. Disconnect the C62 ECM connector.

    2. Disconnect the C37 generator assembly connector.

    3. Disconnect the C20 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
      C20-2 (LIN) or C37-2 (LIN) - C62-61 (LIN) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C20-2(LIN), C37-2 (LIN) or C62-61 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

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


      Powertrain > Engine > Trouble Codes

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

    7. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    8. Turn the ignition switch off and wait 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK DTC OUTPUT


    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.


      Powertrain > Engine > Trouble Codes
      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 ASSEMBLY Click here

    B

    REPLACE ECM Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

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


    1. Disconnect the C62 ECM connector.

    2. Disconnect the C37 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
      C37-2 (LIN) - C62-61 (LIN) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C37-2 (LIN) or C62-61 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE GENERATOR ASSEMBLY for VALEO Made Click here for DENSO Made Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR