SFI SYSTEM > Starter Signal Circuit

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DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition switch to the clutch start switch or the park/neutral position switch and also flows to terminal STA of the ECM (STA Signal).

WIRING DIAGRAM


A240775E01


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the 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 ON and the engine starts.

    OK:
    Condition
    		Starter Signal
    Ignition switch ON
    		OFF
    Engine start
    		ON

Result 
Result
Proceed to
Outside standard range
(for Manual Transaxle)
A
Outside standard range
(for CVT)
B
Within standard range
(for Manual Transaxle)
C
Within standard range
(for CVT)
D


B
Go to step 7

C
Go to step 6

D
Go to step 10
A


2.READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

  1. Disconnect the engine stop and start ECU connector.

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the 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 ON and the engine starts.

    OK:
    Condition
    		Starter Signal
    Ignition switch ON
    		OFF
    Engine start
    		ON

Result 
Result
Proceed to
NG
A
OK
B

  1. Reconnect the engine stop and start ECU connector.



B
REPLACE ENGINE STOP AND START ECU (Click here)
A


3.INSPECT CLUTCH START SWITCH ASSEMBLY
A159771E14

  1. Remove the clutch start switch assembly.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		ON (pushed)
    		Below 1 Ω
    1 - 2
    		OFF (free)
    		10 kΩ or higher

  1. Install the clutch start switch assembly.



NG
REPLACE CLUTCH START SWITCH ASSEMBLY (Click here)
OK


4.INSPECT IGNITION SWITCH ASSEMBLY
A203952E03

  1. Disconnect the ignition switch assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    2 (AM1) - 1 (ST1)
    		START position
    		Below 1 Ω

  1. Reconnect the ignition switch assembly connector.



NG
REPLACE IGNITION SWITCH ASSEMBLY (Click here)
OK


5.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - CLUTCH START SWITCH)

  1. Disconnect the ignition switch assembly connector.

  1. Disconnect the clutch start switch assembly connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    D28-1 (ST1) - A29-2
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    D28-1 (ST1) or A29-2 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ignition switch assembly connector.

  1. Reconnect the clutch start switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM - ST RELAY)

  1. Remove the ST relay.

  1. Disconnect the ECM connector.

  1. Disconnect the clutch start switch assembly connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 2 - A18-48 (STA)
    		Always
    		Below 1 Ω
    ST relay terminal 2 - A29-1
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A18-48 (STA) or A29-1 - Body ground
    		Always
    		10 kΩ or higher

    Result 
    Result
    		Proceed to
    Outside standard range
    		A
    Within standard range
    		B

  1. Reconnect the clutch start switch assembly connector.

  1. Reconnect the ECM connector.

  1. Reinstall the ST relay.



B
Go to step 11
A

REPAIR OR REPLACE HARNESS OR CONNECTOR 

7.INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY
C193931E02

  1. Disconnect the park/neutral position switch assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    4 - 5
    		Shift position P, N
    		Below 1 Ω

    Text in Illustration 
    *1
    		Component without harness connected
    (Park/Neutral Position Switch assembly)

  1. Reconnect the park/neutral start switch assembly connector.



NG
REPAIR OR REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (Click here)
OK


8.INSPECT IGNITION SWITCH ASSEMBLY
A203952E03

  1. Disconnect the ignition switch assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    2 (AM1) - 1 (ST1)
    		START position
    		Below 1 Ω

  1. Reconnect the ignition switch assembly connector.



NG
REPLACE IGNITION SWITCH ASSEMBLY (Click here)
OK


9.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - PARK/NEUTRAL POSITION SWITCH)

  1. Disconnect the ignition switch assembly connector.

  1. Disconnect the park/neutral position switch assembly connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    D28-1 (ST1) - B13-4
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    D28-1 (ST1) or B13-4 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the park/neutral position switch assembly connector.

  1. Reconnect the ignition switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM - ST RELAY)

  1. Remove the ST relay from the engine room relay block.

  1. Disconnect the ECM connector.

  1. Disconnect the park/neutral position switch assembly connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 2 - A18-48 (STA)
    		Always
    		Below 1 Ω
    ST relay terminal 2 - B13-5
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A18-48 (STA) or B13-5 - Body ground
    		Always
    		10 kΩ or higher

    Result 
    Result
    		Proceed to
    Outside standard range
    		A
    Within standard range
    		B

  1. Reconnect the park/neutral position switch assembly connector.

  1. Reconnect the ECM connector.

  1. Reinstall the ST relay.



B
Go to step 11
A

REPAIR OR REPLACE HARNESS OR CONNECTOR 

11.INSPECT BATTERY

  1. Check that the battery is not depleted.

    OK:
    Battery is not depleted.



NG
REPLACE BATTERY
OK


12.CHECK BATTERY TERMINAL

  1. Check that the battery terminals are not loose or corroded.

    OK:
    Battery terminals are not loose or corroded.



NG
REPAIR OR REPLACE BATTERY TERMINAL
OK

REPAIR OR REPLACE STARTER CIRCUIT (STARTER - ST RELAY)