AUTOMATIC TRANSMISSION SYSTEM TCM Power Source Circuit

DESCRIPTION

When the engine switch is turned on (IG), voltage from the ECM MREL terminal is applied to the EFI MAIN1 relay. This causes the contacts of the EFI MAIN1 relay to close, which supplies power to terminal +B of the TCM.

WIRING DIAGRAM

Refer to DTC P0560 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND)


    1. A01FE4UE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to TCM)

      Disconnect the TCM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A74-2 (E1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - TCM)


    1. Disconnect the No. 1 integration relay 2E connector.

    2. Disconnect the A74 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2E-14 - A74-5 (+B) Always Below 1 Ω
      2E-14 or A74-5 (+B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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