ECD SYSTEM (w/ EGR Cooler Bypass Valve) 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

A01KHOOE02

INSPECTION PROCEDURE

Note


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

  • 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 INTELLIGENT TESTER (STARTER SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Select the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

    4. Read values.

      Standard
      Ignition Switch Position Starter SIG
      ON off
      START on

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

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


    1. Disconnect the E17 ECM connector.

    2. Remove the ST relay from the R/B No. 2.

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

      Standard resistance
      Tester Connection Specified Condition
      Relay block ST relay terminal 1 - E17-6 (STA) Below 1 Ω
      Relay block ST relay terminal 1 or E17-6 (STA) - Body ground 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the ST relay


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here