Cranking Holding Function Circuit

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

Cranking Holding Function Circuit

DESCRIPTION

The starter is controlled by the ECM, when the ECM detects a start signal (STSW) from the ignition switch, this system monitors the engine speed (NE) and continues to operate the starter until it has determined that the engine has started (engine speed reaches approximately 500 rpm). If the engine is already running and the ignition switch is turned to START, the ECM will not operate the starter.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION OF ENGINE CRANKING
(a) When turning the ignition switch to the START position, check whether the starter motor starts.
OK -- CHECK FOR INTERMITTENT PROBLEMS

NG -- Continue to next step.

2. READ VALUE USING TECHSTREAM (STA SIGNAL)
(a) Connect the Techstream to the DLC3.
(b) Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.
(c) Read the values.
Standard:





OK -- INSPECT STARTER RELAY

NG -- Continue to next step.

3. INSPECT ECM (STAR AND STSW VOLTAGE)




(a) Measure the voltage between the terminals of the E5 and E6 ECM connectors, while cranking the engine.
Standard voltage:





Result:





C -- CHECK FUSE (STA NO. 2)
B -- REPLACE ECM
A -- Continue to next step.

4. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY




(a) Disconnect the I18 ignition switch connector.
(b) Check the resistance.
Standard resistance:





(c) Reconnect the ignition switch connector.

NG -- REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY
OK -- CHECK AND REPLACE HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)
5. INSPECT STARTER RELAY




(a) Remove the starter relay from the engine room R/B.
(b) Inspect the starter relay.
Standard resistance:





(c) Reinstall the starter relay.

NG -- REPLACE STARTER RELAY
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - BODY GROUND)




(a) Check the harness and connector between the park/neutral position switch and starter relay.
(1) Disconnect the P1 park/neutral position switch connector.
(2) Remove the starter relay from the engine room R/B.
(3) Measure the resistance between the wire harness side connectors.
Standard resistance (Check for open):





Standard resistance (Check for short):





(4) Reconnect the park/neutral position switch connector.
(5) Reinstall the starter relay.
(b) Check the harness and connector between the starter relay and body ground.
(1) Measure the resistance between each relay and body ground.
Standard resistance (Check for open):





(2) Reinstall the starter relay.

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

7. INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)




(a) Remove the starter relay from the engine room R/B.
(b) Measure the voltage between the terminal of the engine room R/B and body ground.
Standard voltage:





(c) Reinstall the starter relay.

NG -- CHECK AND REPLACE HARNESS AND CONNECTOR (STARTER RELAY - BATTERY)
OK -- Continue to next step.

8. INSPECT STARTER ASSEMBLY
(a) Inspect the starter assembly Starter (for Standard) for Standard, Starter (for Cold Area) for Cold area).

NG -- REPAIR OR REPLACE STARTER ASSEMBLY
OK -- CHECK AND REPLACE HARNESS AND CONNECTOR (STARTER RELAY - STARTER, STARTER - BATTERY)
9. CHECK FUSE (STA NO. 2)




(a) Remove the STA No. 2 fuse from the driver side J/B.
(b) Check for continuity in the STA No. 2 fuse.
Standard:
Continuity
(c) Reinstall the STA No. 2 fuse.

NG -- CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED NO. 2 STA FUSE AND REPLACE NO. 2 STA FUSE
OK -- Continue to next step.

10. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY




(a) Disconnect the I18 ignition switch connector.
(b) Check for continuity between the terminals shown in the chart below.
Standard:





(c) Reconnect the ignition switch connector.

NG -- REPLACE IGNITION OR STARTER SWITCH ASSEMBLY
OK -- CHECK AND REPLACE HARNESS AND CONNECTOR (ECM - BATTERY)