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ECM Communication Stop Mode: Procedure

  1. CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (ECM MAIN WIRE) 
    1. Turn the ignition switch off.
    2. Disconnect the ECM connector.
      Fig 1: Identifying Terminal CANH And CANL Of ECM Connector
      GTY244334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A37-41 (CANH) - A37-49 (CANL) Ignition switch off 108 to 132 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK WIRE HARNESS (POWER SOURCE CIRCUIT) 
    1. Check the ECM power source circuit. Refer to ECM Power Source Circuit for 2ZR-FE and ECM Power Source Circuit for 2AZ-FE.

      Result

      Result Proceed to
      OK (for 2ZR-FE) A
      OK (for 2AZ-FE) B
      NG C

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    B → See step   4 

    A → See step   3 

  3. REPLACE ECM. Refer to  REMOVAL 
  4. REPLACE ECM. Refer to  REMOVAL 
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