AUTOMATIC TRANSMISSION SYSTEM TCM Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), voltage from the MREL terminal of the ECM 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. A0019F5E02
      *1 Rear view of wire harness connector: (to TCM)

      Disconnect the A12 and E5 TCM connectors.

    2. Turn the engine switch on (IG).

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

      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 according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E5-7 (E1) - Body ground Always Below 1 Ω

    OK

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

    NG

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