AUTOMATIC TRANSMISSION SYSTEM TCM Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the EFI MAIN2 relay. This causes the contacts of the EFI MAIN2 relay to close, which supplies power to terminal +B of the TCM.

WIRING DIAGRAM

A001BD1E10
*a EFI NO. 1
*b from ECM
*c Battery

PROCEDURE


  1. CHECK TCM (POWER SOURCE, GROUND)


    1. A001AIKE01
      *1 TCM Connector

      Disconnect the A12 and E5 TCM connectors.

    2. Turn the engine switch on (IG).

    3. Measure the voltage of the wire harness side connectors.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A12-6 (+B) - E5-7 (E1) Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Measure the resistance of the wire harness side connector.

      Standard resistance
      Tester Connection Condition Specified Condition
      E5-7 (E1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for 1UR-FSE) B
      OK (for 1UR-FE) C

    A

    CHECK HARNESS AND CONNECTOR (TCM - EFI MAIN NO. 2 RELAY, GROUND)

    B

    GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM) Click here

    C

    GO TO ECM POWER SOURCE CIRCUIT (ENGINE CONTROL SYSTEM / SFI SYSTEM) Click here