SFI SYSTEM Cranking Holding Function Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal STAR of the power management control ECU to clutch start switch assembly or park/neutral position switch assembly and also flows to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

A0118AME01

INSPECTION PROCEDURE

Note

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

Tech Tips

This chart is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to 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.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

    5. Check the result when the ignition switch is turned ON and the engine starts.

      OK
      Ignition Switch Position Starter Signal
      Ignition switch ON OFF
      Engine start ON

    NG

    CHECK HARNESS AND CONNECTOR (ECM - ST RELAY) Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

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


    1. Disconnect the A18 ECM connector.

    2. Remove the ST relay from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A18-48 (STA) - 2 (ST relay) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here