SFI SYSTEM (w/o Electronic Throttle Control System) Starter Signal Circuit

DESCRIPTION

When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore necessary in order to achieve good startability. While the engine is being cranked, the battery voltage is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection volume for the starting injection control and after-start injection control.

WIRING DIAGRAM

A013915E01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT STARTER SIGNAL


    1. Connect the intelligent tester to the DLC3.

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

    3. Select the following menu items: Powertrain / Engine and ECT / Data List / Starter SIG.

    4. Check the result when the ignition switch is turned to the ON and START positions.

      Standard
      Ignition Switch Position ON START
      STARTER SIG OFF ON

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

    NG

  2. CHECK HARNESS AND CONNECTOR (ECM - IGNITION SWITCH)


    1. A0137FME01

      Disconnect the B25 ECM connector.

    2. Disconnect the C13 ignition switch connector.

    3. Measure the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      STA (B25-73) - Ignition switch connector ST1 (C13-3) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      STA (E19-33) or Ignition switch connector ST1 (C13-3) - Body ground 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the ignition switch connector.


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM