Cranking Holding Function Circuit
2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Holding Function Circuit
- Cranking Holding Function Circuit
DESCRIPTION
The system detects the ignition switch's starting signal (STSW) and then supplies current to the starter until the ECM judges that the engine has started successfully. The purpose is to reduce the holding time of the ignition key.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK CRANKING
(a) When starting the engine, check whether the starter motor starts.
OK:
Engine is cranking.
NG -- READ VALUE USING TECHSTREAM (STA SIGNAL)
OK -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
2. READ VALUE USING TECHSTREAM (STA SIGNAL)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch on (IG).
(c) Turn the tester on.
(d) Select the following menu items: Powertrain / Engine and ECT / Data List / Starter Signal.
(e) Check the result when the ignition switch is turned on (IG) and when the engine is started.
OK:
NG -- CHECK ECM (STAR AND STSW VOLTAGE)
OK -- Continue to next step.
3. INSPECT ST RELAY
(a) Remove the ST relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Reinstall the ST relay.
NG -- REPLACE ST RELAY
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST RELAY)
(a) Disconnect the park/neutral position switch connector.
(b) Remove the ST relay from the engine room relay block.
(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 connector.
(e) Reinstall the ST relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST RELAY)
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)
(a) Remove the ST relay 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 ST relay to the engine room relay block.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BODY GROUND)
OK -- Continue to next step.
6. INSPECT TERMINAL VOLTAGE (ST RELAY TERMINAL)
(a) Remove the ST relay from the engine room relay block.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Text in Illustration
(c) Reinstall the ST relay to the engine room relay block.
NG -- INSPECT FUSIBLE LINK (ST FUSE)
OK -- Continue to next step.
7. INSPECT STARTER ASSEMBLY
(a) Inspect the starter assembly Testing and Inspection.
NG -- REPLACE STARTER ASSEMBLY Components
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)
(a) Remove the ST relay from the engine room relay block.
(b) Disconnect the starter 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 starter connector.
(e) Reinstall the ST relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - STARTER ASSEMBLY)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER ASSEMBLY)
9. INSPECT FUSIBLE LINK (ST FUSE)
(a) Remove the fusible link 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 fusible link.
NG -- REPLACE FUSIBLE LINK
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER RELAY)
10. CHECK ECM (STAR AND STSW VOLTAGE)
(a) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Text in Illustration
Result:
C -- CHECK HARNESS AND CONNECTOR (ECM - MAIN BODY ECU)
B -- REPLACE ECM Components
A -- Continue to next step.
11. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY
(a) Inspect the park/neutral position switch.
(b) Disconnect the park/neutral position switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Text in Illustration
Result:
(d) Reconnect the park/neutral position switch connector.
C -- REPLACE PARK/NEUTRAL POSITION SWITCH
B -- REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Components
A -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH)
(a) Disconnect the ECM connector.
(b) Disconnect the park/neutral position 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):
(d) Reconnect the ECM connector.
(e) Reconnect the park/neutral position switch connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH)
OK -- Continue to next step.
13. INSPECT RELAY (ST CUT RELAY)
(a) Remove the ST CUT relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Reinstall the ST CUT relay.
NG -- REPLACE RELAY
OK -- Continue to next step.
14. INSPECT TERMINAL VOLTAGE (ST CUT RELAY TERMINAL)
(a) Remove the ST CUT relay from the engine room relay block.
(b) Turn the ignition switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
Text in Illustration
(d) Reinstall the ST CUT relay.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ST CUT RELAY - IG2 RELAY)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ST CUT RELAY - BODY GROUND)
15. CHECK HARNESS AND CONNECTOR (ECM - MAIN BODY ECU)
(a) Disconnect the ECM connector.
(b) Disconnect the main body 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 ECM connector.
(e) Reconnect the main body ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - MAIN BODY ECU)
OK -- CHECK SMART KEY SYSTEM How To Proceed With Troubleshooting