ECD SYSTEM Starter Signal Circuit

DESCRIPTION

When the engine is cranked, the intake air flow becomes 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 starting and after-start injection control.

WIRING DIAGRAM

A01SD9DE01

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Read the STA signal on the intelligent tester while the starter operates.

      OK
      Ignition Switch Position Starter SIG
      LOCK, ACC, ON OFF
      START ON
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM)


    1. Disconnect the clutch start switch connector.

    2. Disconnect the ECM connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      B2-1 - G120-6 (STA) Always Below 1 Ω
      B2-1 or G120-6 (STA) - Body ground and other terminals Always 10 kΩ higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR