Diagnostic procedure

WARNING: This page is about a different variant/trim than selected.

DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION	RESULTS	ACTION
1	VERIFY PCM AND CLIMATE CONTROL UNIT DTC Retrieve the PCM and climate control unit DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) (See DTC DISPLAY .) Are there any DTCs displayed?	Yes	Go to the appropriate DTC inspection. (See DTC TABLE .) (See DTC TABLE .) (See DTC TABLE [ARAB GULF COOPERATION COUNCIL] .)
1		No	Go to the next step.
2	DETERMINE IF MALFUNCTION CAUSE IS MAGNETIC CLUTCH OR OTHER Start the engine and idle it. Turn the A/C switch on with blower switch is on. Remove the A/C relay. Does the magnetic clutch disengage?	Yes	Go to Step 4.
2		No	Go to the next step.
3	INSPECT IF MALFUNCTION CAUSE IS MAGNETIC CLUTCH POWER SUPPLY OR MAGNETIC CLUTCH Switch the ignition to ON. Remove the A/C relay. Disconnect the magnetic clutch connector. Switch the ignition to ON. Measure the voltage between magnetic clutch terminal A and body ground. Is the voltage B+?	Yes	Repair or replace suspected wiring harness and connector.
3		No	Replace the A/C compressor. (Magnetic clutch engagement is stuck.) (See A/C COMPRESSOR REMOVAL/INSTALLATION .)
4	INSPECT A/C RELAY Inspect the A/C relay. (See RELAY INSPECTION .) Is the A/C relay normal?	Yes	Go to the next step.
4		No	Replace the A/C relay.
5	DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR MAGNETIC CLUTCH CONTROL CIRCUIT Access and monitor the PCM PID ACCS using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Start the engine and idle it. Turn the A/C switch on and off with blower switch is on. Is the PID value always ON?	Yes	Full-auto air conditioner: Replace the climate control unit (A/C switch signal is always on). (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .) Manual air conditioner: Go to the next step.
5		No	Inspect for short to ground between PCM terminal 1I and A/C relay. Repair or replace suspected wiring harness and connector.
6	DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL RELATED WIRING HARNESS OR CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER) Switch the ignition to off. Disconnect the instrument cluster and climate control unit connectors. Verify continuity between climate control unit connector terminal 1L and body ground. Is there continuity?	Yes	Repair or replace suspected wiring harness and connector.
6		No	Replace the climate control unit. (A/C switch signal is always on.) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER] .)
7	Verify test results. If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX .) If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.