CAN COMMUNICATION SYSTEM (for LHD) ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

When either condition below is met:


  • "ECM (Engine)" is not displayed on "CAN Bus Check".

  • Applies to "ECM Communication Stop Mode" in "DTC Combination Table".

  • Power source or ECM

  • ECM

WIRING DIAGRAM

A01ESCIE04

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


    1. Disconnect the A38 and C53 ECM connectors.

      A01EPPRE08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A38-1 (BATT) - Body ground Always 11 to 14 V
      A38-2 (+B2) - Body ground When battery positive (+) voltage is applied to terminal A38-34 (MREL) 11 to 14 V
      A38-3 (+B) - Body ground When battery positive (+) voltage is applied to terminal A38-34 (MREL) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C53-81 (E1) - Body ground Always Below 1 Ω
      C53-42 (E02) - Body ground Always Below 1 Ω
      C53-43 (E01) - Body ground Always Below 1 Ω
      C53-82 (ME01) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here