Diagnostic procedure

DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION		ACTION
1	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related Service Bulletins available?	Yes	Perform repair or diagnosis according to the available Service Bulletins. If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	INSPECT CLOCK SPRING CONNECTOR CONDITION WARNING: Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the air bag system service warnings and cautions before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS .) (See AIR BAG SYSTEM SERVICE CAUTIONS .) Turn the ignition switch to off. Disconnect the Clock spring connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are there any malfunction?	Yes	Repair or replace suspected part, then go to Step 9.
2		No	Go to the next step.
3	INSPECT CLOCK SPRING Inspect the clock spring. (See CLOCK SPRING INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .) (See CLOCK SPRING INSPECTION [STANDARD DEPLOYMENT CONTROL SYSTEM] .) Is there malfunction?	Yes	Replace the clock spring, then go to Step 9. (See CLOCK SPRING REMOVAL/INSTALLATION .)
3		No	Go to the next step.
4	INSPECT CRUISE CONTROL SWITCH Inspect the cruise control switch. (See CRUISE CONTROL SWITCH INSPECTION [MZI-3.7] .) Is there malfunction?	Yes	Replace the steering switch, then go to Step 9. (See STEERING SWITCH REMOVAL/INSTALLATION .)
4		No	Go to the next step.
5	INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO GROUND Clock spring connector is disconnected. Inspect for continuity between clock spring terminal 2B (wiring harness-side) and body ground. Is there continuity?	Yes	If the short to ground circuit could be detected: Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION .) Go to Step 9.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR CONNECTION Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Are there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
6		No	Go to the next Step.
7	INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY Clock spring and PCM connectors are disconnected. Turn the ignition switch to the ON position (Engine off). Measure the voltage between the following terminals: Clock spring terminal 2B Clock spring terminal 2C Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
7		No	Go to the next step.
8	INSPECT CRUISE CONTROL SWITCH CIRCUIT FOR OPEN CIRCUIT Clock spring and PCM connectors are disconnected. Turn ignition switch off. Inspect for continuity between the following terminals: Clock spring terminal 2B (wiring harness-side) and PCM terminal 1N Clock spring terminal 2C (wiring harness-side) and PCM terminal 1L Is there continuity?	Yes	Go to the next step.
8		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0579 HAS BEEN COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE .) Drive the vehicle using cruise control for 2 min or more Perform a DTC reading procedure. (See ON-BOARD DIAGNOSTIC TEST .) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION .) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE ". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
10		No	Troubleshooting completed.