Cranking Holding Function Circuit

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Holding Function Circuit
- Cranking Holding Function Circuit

DESCRIPTION

The cranking holding control system provides current to the starter when the ECM detects the ignition switch start signal (STSW). When the ECM determines that the engine has started, the system cuts current to the starter. When the ECM receives the STSW signal, it turns on the ACC Cut relay, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to terminal STAR of the ECM. Then the STAR output signal travels through the park/neutral position (PNP) switch to the ST relay, causing the starter to activate.

When the engine is cranking, the starter operation signal is sent to terminal STA of the ECM.





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK CRANKING

(a) Check the cranking of the engine.

Result





C -- CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - ECM)

B -- READ VALUE USING TECHSTREAM (STARTER SIGNAL)

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

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) Check the result when the ignition switch is turned to ON and when the engine is started.

Standard:





NG -- CHECK IGNITION SWITCH ASSEMBLY (POWER SOURCE)
OK -- Continue to next step.

3. INSPECT STARTER RELAY (ST)

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

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

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

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

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

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

Standard Resistance:





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

5. CHECK HARNESS AND CONNECTOR (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:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY (ST) - BATTERY, BODY GROUND)
OK -- Continue to next step.

6. INSPECT STARTER ASSEMBLY

(a) Inspect the starter assembly (for 1.6 kW type) Starter (For 1.6 KW Type).

(b) Inspect the starter assembly (for 1.4 kW type) Starter (For 1.4 KW Type).

Result





C -- REPLACE STARTER ASSEMBLY Removal

B -- REPLACE STARTER ASSEMBLY Removal

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER ASSEMBLY - STARTER RELAY (ST), BATTERY)

7. CHECK IGNITION SWITCH ASSEMBLY (POWER SOURCE)





(a) Disconnect the ignition switch assembly connector.

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

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH ASSEMBLY - BATTERY POSITIVE TERMINAL)
OK -- Continue to next step.

8. INSPECT IGNITION SWITCH ASSEMBLY

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

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

9. CHECK HARNESS AND CONNECTOR (POWER SOURCE)





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

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

Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - IGNITION SWITCH ASSEMBLY)
OK -- Continue to next step.

10. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

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

NG -- REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Removal

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

11. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - ECM)

(a) Disconnect the ignition switch assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:





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

12. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)

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

(b) Disconnect the ECM connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal