CAN COMMUNICATION SYSTEM(for RHD) ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

Either condition is met:


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

  • "ECM Communication Stop Mode" in "DTC Communication Table" applies.

  • Power source or inside of ECM

  • ECM

WIRING DIAGRAM

A01X5UJE02
except 1VD-FTV
*a EFI MAIN
*b from Battery
*c from EFI Relay
*d to EFI Relay
A01X0WJE01
for 1VD-FTV
*a EFI MAIN
*b from Battery
*c to EFI Relay

CAUTION / NOTICE / HINT

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 A52 and C46 ECU connectors.

      A01X2BOE01
      Text in Illustration
      *A except 1VD-FTV *B for 1VD-FTV
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

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

      Standard Resistance
      except 1VD-FTV
      Tester Connection Condition Specified Condition
      C46-81 (E1) - Body ground Always Below 1 Ω
      C46-42 (E02) - Body ground Always Below 1 Ω
      C46-43 (E01) - Body ground Always Below 1 Ω
      C46-82 (ME01) - Body ground Always Below 1 Ω
      for 1VD-FTV
      Tester Connection Condition Specified Condition
      A52-32 (EC) - Body ground Always Below 1 Ω
      C46-81 (E1) - Body ground Always Below 1 Ω
      C46-21 (E02) - Body ground Always Below 1 Ω
      C46-22 (E01) - Body ground Always Below 1 Ω

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

      Standard Voltage
      except 1VD-FTV
      Tester Connection Condition Specified Condition
      A52-1 (BATT) - Body ground Always 11 to 14 V
      A52-2 (+B2) - Body ground Battery positive (+) voltage applied to terminal A52-34 (MREL) 11 to 14 V
      A52-3 (+B) - Body ground Battery positive (+) voltage applied to terminal A52-34 (MREL) 11 to 14 V
      for 1VD-FTV
      Tester Connection Condition Specified Condition
      A52-20 (BATT) - Body ground Always 11 to 14 V
      A52-44 (MREL) - Body ground Ignition switch ON 11 to 14 V
      A52-2 (+B) - Body ground Battery positive (+) voltage applied to terminal A52-44 (MREL) 11 to 14 V
      Result
      Result Proceed to
      OK (for 1GR-FE) A
      OK (for 1UR-FE) B
      OK (for 1VD-FTV) C
      NG D

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE HARNESS OR CONNECTOR