Operation CHARM: Car repair manuals for everyone.
Home >> Toyota Truck >> 2012 >> 4 Runner 4WD V6-4.0L (1GR-FE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Starter Signal Circuit

Starter Signal Circuit





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

DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition switch*1 or terminal STAR of the power management control ECU*2 to the park/neutral position switch and also flows to terminal STA of the ECM (STA Signal).

* *1: w/o Smart Key System

* *2: w/ Smart Key System

WIRING DIAGRAM









INSPECTION PROCEDURE

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

HINT
This chart is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to Problem Symptoms Table Symptom Related Diagnostic Procedures.

PROCEDURE

1. CHECK IF VEHICLE IS EQUIPPED WITH SMART KEY SYSTEM

(a) Check if the vehicle is equipped with the smart key system.

Result





B -- READ VALUE USING TECHSTREAM (STARTER SIGNAL)
A -- Continue to next step.

2. 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) Read the value.

OK:





NG -- CHECK STARTER RELAY (ST) (POWER SOURCE)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

3. CHECK STARTER RELAY (ST) (POWER SOURCE)

(a) Remove the starter relay (ST) from the engine room relay block.





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

Standard Voltage:





HINT
The engine does not crank because the relay is not installed.

Text in Illustration





(c) Reinstall the starter relay (ST).

NG -- CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)
OK -- Continue to next step.

4. INSPECT STARTER RELAY (ST)

(a) Inspect the starter relay (ST) Testing and Inspection.

NG -- REPLACE STARTER RELAY (ST)
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST) - BODY GROUND)

(a) Remove the starter relay (ST) from the engine room relay block.





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

Standard Resistance:





Text in Illustration





(c) Reinstall the starter relay (ST).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY (ST) - BODY GROUND)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH)

6. CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

(a) Remove the starter relay (ST) from the engine room relay block.

(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):





(d) Reinstall the starter relay (ST).

(e) Reconnect the park/neutral position switch assembly connector.

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

7. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

(a) Inspect the park/neutral position switch assembly for 4WD Inspection.

(b) Inspect the park/neutral position switch assembly for 2WD .

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

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

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

(b) Disconnect the ignition 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):





(d) Reconnect the park/neutral position switch assembly connector.

(e) Reconnect the ignition switch assembly connector.

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

9. INSPECT IGNITION SWITCH ASSEMBLY

(a) Inspect the ignition switch assembly Testing and Inspection.

NG -- REPLACE IGNITION SWITCH ASSEMBLY Removal

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH ASSEMBLY - BATTERY)

10. 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) Read the value.

OK:





NG -- CHECK STARTER RELAY (ST) (POWER SOURCE)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

11. CHECK STARTER RELAY (ST) (POWER SOURCE)

(a) Remove the starter relay (ST) from the engine room relay block.





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

Standard Voltage:





HINT
The engine does not crank because the relay is not installed.

Text in Illustration





(c) Reinstall the starter relay (ST).

NG -- CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)
OK -- Continue to next step.

12. INSPECT STARTER RELAY (ST)

(a) Inspect the starter relay (ST) Testing and Inspection.

NG -- REPLACE STARTER RELAY (ST)
OK -- Continue to next step.

13. CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST) - BODY GROUND)

(a) Remove the starter relay (ST) from the engine room relay block.





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

Standard Resistance:





Text in Illustration





(c) Reinstall the starter relay (ST).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY (ST) - BODY GROUND)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH)

14. CHECK HARNESS AND CONNECTOR (STARTER RELAY (ST) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

(a) Remove the starter relay (ST) from the engine room relay block.

(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):





(d) Reinstall the starter relay (ST).

(e) Reconnect the park/neutral position switch assembly connector.

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

15. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

(a) Inspect the park/neutral position switch assembly for 4WD Inspection.

(b) Inspect the park/neutral position switch assembly for 2WD .

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

16. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

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

(b) Disconnect the power management control ECU connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the park/neutral position switch assembly connector.

(e) Reconnect the power management control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- GO TO SMART KEY SYSTEM How To Proceed With Troubleshooting
pro multis · About Operation CHARM