CHARGING SYSTEM(w/o Stop And Start System), Diagnostic DTC:P161A

DTC Code DTC Name
P161A Lost Communication with Alternator

DESCRIPTION

The generator assembly communicates with the ECM through the LIN communication system.

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 17.5 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

WIRING DIAGRAM

A00484PE17

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 (GENERATOR ASSEMBLY - ECM)


    1. Disconnect the B112 ECM connector (for LHD).

    2. Disconnect the B118 ECM connector (for RHD).

    3. Disconnect the B111 generator assembly connector.

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

      for LHD
      Tester Connection Condition Specified Condition
      B111-2 (LIN) - B112-61 (LIN) Always Below 1 Ω
      B111-2 (LIN) or B112-61 (LIN) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B111-2 (LIN) - B118-61 (LIN) Always Below 1 Ω
      B111-2 (LIN) or B118-61 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM


    1. Reconnect the B112 ECM connector (for LHD).

    2. Reconnect the B118 ECM connector (for RHD).

    3. Turn the ignition switch to ON.

    4. A0048V8C01
      *a

      Front view of wire harness connector

      (to Generator Assembly)

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content
      Tester Connection B111-2 (LIN) - Body ground)
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Condition Ignition switch ON
      OK
      Waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE GENERATOR ASSEMBLY Click here

    NG

    REPLACE ECM Click here