ECD SYSTEM Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST2 of the ignition switch to the ST fuse and also flows to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

A01BAK8E04

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

This chart is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to the problem symptoms table Click here.

PROCEDURE


  1. READ VALUE USING STARTER SIGNAL


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

    3. Enter the following menus: Power train / Engine / Data List / Starter Signal.

    4. Read the values.

      Standard
      Ignition Switch Position ON START
      Starter Signal OFF ON

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

    NG

  2. CHECK HARNESS AND CONNECTOR (STARTER RELAY - ECM)


    1. A01BFWCE01

      Disconnect the B9 ECM connector.

    2. Remove the ST relay from the engine room J/B and R/B No.1.

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

      Standard resistance
      Tester Connection Specified Condition
      B9-7 (STA) - R/B ST relay terminal 1 Below 1 Ω
      B9-7 (STA) or R/B ST relay terminal 1- Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM