AUTOMATIC TRANSAXLE SYSTEM ECU Power Source Circuit

DESCRIPTION

When the ignition switch is turned ON, voltage from the MREL terminal of the ECM is applied to the EFI MAIN relay. This causes the contacts of the EFI MAIN relay to close, which supplies power to terminal +B of the TCM.

WIRING DIAGRAM

Refer to DTC U0100 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK TCM (TCM - BODY GROUND)


    1. A006U2LE06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to TCM)

      Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B77-8 (E1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - TCM)


    1. A006TBBE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)
      *2

      Front view of wire harness connector

      (to TCM)

      Remove the integration relay from the engine room No. 1 relay block Click here.

    2. Disconnect the TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-4 - B77-18 (+B) Always Below 1 Ω
      1B-4 or B77-18 (+B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO ECD SYSTEM (ECM POWER SOURCE CIRCUIT) Click here