Starter Signal Circuit

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Starter Signal Circuit
- Starter Signal Circuit

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





INSPECTION PROCEDURE

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

PROCEDURE

1. READ VALUE USING TECHSTREAM (STARTER SIGNAL)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

(e) Check the result when the ignition switch is turned ON and the engine starts.

OK:





Result





D -- CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM - STA RELAY)

C -- CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM - STA RELAY)

B -- INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY
A -- Continue to next step.

2. INSPECT CLUTCH START SWITCH ASSEMBLY





(a) Remove the clutch start switch Removal.

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

Standard Resistance:





Text in Illustration





NG -- REPLACE CLUTCH START SWITCH ASSEMBLY Removal
OK -- Continue to next step.

3. INSPECT IGNITION SWITCH ASSEMBLY





(a) Disconnect the ignition switch connector.

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

Standard Resistance:





NG -- REPLACE IGNITION SWITCH ASSEMBLY Removal
OK -- Continue to next step.

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

(a) Disconnect the ignition switch connector.

(b) Disconnect the clutch start switch connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM - STA RELAY)

(a) Remove the STA relay from the engine room relay block.

(b) Disconnect the ECM connector.

(c) Disconnect the clutch start switch connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Result





B -- INSPECT BATTERY

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR

6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY





(a) Disconnect the park/neutral position switch connector.

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

Standard Resistance:





Text in Illustration





NG -- REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Removal
OK -- Continue to next step.

7. INSPECT IGNITION SWITCH ASSEMBLY





(a) Disconnect the ignition switch connector.

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

Standard Resistance:





NG -- REPLACE IGNITION SWITCH ASSEMBLY Removal
OK -- Continue to next step.

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

(a) Disconnect the ignition switch connector.

(b) Disconnect the park/neutral position switch assembly connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM - STA RELAY)

(a) Remove the STA relay from the engine room relay block.

(b) Disconnect the ECM connector.

(c) Disconnect the park/neutral position switch connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. INSPECT BATTERY

(a) Check that the battery is not depleted.

OK:

Battery is not depleted.

NG -- REPLACE BATTERY
OK -- Continue to next step.

11. CHECK BATTERY TERMINAL

(a) 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 - STA RELAY)