SFI SYSTEM > Starter Signal Circuit

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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


A113422E02


INSPECTION PROCEDURE


When using intelligent tester:

1.READ DATA LIST (STA SIGNAL)

  1. Connect the intelligent tester to the DLC3.

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

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

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

    Result:
    Ignition Switch Position
    		STA Signal
    ON
    		OFF
    START
    		ON



OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG


2.CHECK WIRE HARNESS (ECM - IGNITION SWITCH)
G034713E01

  1. Disconnect the E9 ECM connector.

  1. Disconnect the I6 ignition switch connector.

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

    Standard resistance:
    Tester Condition
    		Specified Condition
    E9-12 (STA) - I6-7 (ST2)
    		Below 1 Ω
    E9-12 (STA) or I6-7 (ST2) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM 


When not using intelligent tester:

1.CHECK ECM (STA VOLTAGE)
A066060E24

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E9-12 (STA) - E12-3 (E1)
    		0 V

  1. Measure the voltage of the ECM connectors when the engine is cranked.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E9-12 (STA) - E12-3 (E1)
    		6 V or more



OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG


2.CHECK WIRE HARNESS
G034713E01

  1. Disconnect the E9 ECM connector.

  1. Disconnect the I6 ignition switch connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E9-12 (STA) - I6-7 (ST2)
    		Below 1 Ω
    E9-12 (STA) or I6-7 (ST2) - Body ground
    		10 kΩ or higher



OK
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM