CHARGING SYSTEM(w/ Stop And Start 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 and illuminates the charging warning light.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

P161A

Lost Communication with Alternator

Generator assembly or ECM communication stop for 1000 seconds or more with the ignition switch ON

(40 trip detection logic)

  • LIN communication system

  • Generator assembly

  • ECM

Charging warning light comes on

DTC stored

WIRING DIAGRAM

A326255E03

CAUTION / NOTICE / HINT

Note:

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

  • After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

PROCEDURE

  1. CHECK LIN COMMUNICATION SIGNAL WAVEFORM (ECM - GENERATOR ASSEMBLY)

    A328751C01

    *a

    Front view of wire harness connector

    (to Generator Assembly)

    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the A40 battery current sensor assembly connector.

    3. Disconnect the B32 generator assembly connector.

    4. Connect the cable to the negative (-) battery terminal.

    5. Connect the GTS to the DLC3.

    6. Connect an oscilloscope to battery current sensor assembly connector.

    7. Turn the ignition switch to ON.

    8. Turn the GTS on.

    9. A328753E01

      After clearing the DTCs, check waveform.

      Click here

      OK

      The waveform is similar to that shown in the illustration.

      Tip:

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      Tester connection

      B32-2 (LIN) - Body ground

      Tool setting

      5 V/DIV., 500 μs./DIV.

      Condition

      Ignition switch ON

    Result

    Result

    OK

    NG
    NG

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

    OK

  2. READ OUTPUT DTC (DTC P161A)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs

    5. Start the engine and wait 17 minutes or more.

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

    7. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes

    Result

    Result

    Proceed to

    DTC P161A is output

    A

    DTCs are not output

    B
    A

    REPLACE GENERATOR ASSEMBLY

    for 80A Type:Click here

    for 100A Type:Click here

    B

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

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

    1. Disconnect the B31 ECM connector.

    2. Disconnect the B32 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

      B31-76 (LIN) - B32-2 (LIN)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      B31-76 (LIN) or B32-2 (LIN) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the B31 ECM connector.

    5. Reconnect the B32 generator assembly connector.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR