Diagnostic Procedure

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

STEP	INSPECTION	RESULTS	ACTION
1	VERIFY IF MALFUNCTION INCLUDES ROUGH IDLING Does the engine idle roughly?	Yes	Go to the symptom troubleshooting "NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE". (See NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE .)
1		No	Go to the next step.
2	DETERMINE IF MALFUNCTION CAUSE IS A/C SYSTEM OR OTHER Turn off the A/C switch and fan switch. Does the A/C magnetic clutch engage?	Yes	Go to the symptom troubleshooting "NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY". (See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY .)
2		No	Go to the next step.
3	INSPECT INTAKE AIR SYSTEM FOR AIR LEAKAGE Verify the following: Proper routing of and no damage to vacuum lines No air leakage from intake-air system Are all items normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 3.
4	VERIFY PCM DTC Switch the ignition to ON (Engine off). Retrieve any DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Are there any DTCs displayed?	Yes	DTC is displayed: Go to the appropriate DTC inspection. (See DTC TABLE .)
4		No	No DTC is displayed: Go to the next step.
5	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION Perform the drive-by-wire control system operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Does the drive-by-wire control system function properly?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning part according to the inspection results.
6	DETERMINE IF MALFUNCTION CAUSE IS EVAP CONTROL SYSTEM OR OTHER Disconnect the vacuum hose between purge solenoid valve and intake manifold from purge solenoid side. Plug opening end of vacuum hose. Start the engine. Does the engine condition improve?	Yes	Inspect the EVAP control system. Repair or replace the malfunctioning part according to the inspection results.
6		No	Go to the next step.
7	VERIFY CURRENT INPUT SIGNAL STATUS CAUTION: While performing this step, always operate the vehicle in a safe and lawful manner. When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. Access the following PCM PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST .) APP1 APP2 TP1 TP2 MAF VSS Monitor each PID while driving the vehicle. Are all PIDs normal? (See PCM INSPECTION .)	Yes	Go to the next step.
7		No	APP1 or APP2 PID is not specified: Inspect the APP sensor. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION .) TP1 or TP2 PID is not specified: Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION .) MAF PID is not specified: Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION .) VSS PID is not specified: Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION [AY6A-EL] .) Repair or replace the malfunctioning part according to the inspection results.
8	VERIFY CURRENT INPUT SIGNAL STATUS Access the following PCM and TCM PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST .) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [AY6A-EL] .) PCM PIDs AC_REQ BOO TCM PID TR Are all PIDs normal? (See PCM INSPECTION .)	Yes	Go to the next step.
8		No	AC_REQ PID is not specified: Inspect the following: A/C switch Evaporator temperature sensor (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [MANUAL AIR CONDITIONER] .) (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER] .) Fan switch Communication between climate control unit and instrument cluster (Full-auto air conditioner) Communication between instrument cluster and PCM Short to ground in wiring harness between climate control unit terminal 1L and instrument cluster terminal 1A (Manual air conditioner) BOO PID is not specified: Inspect the brake switch and related wiring harness for vibration or intermittent open/short circuit. (See BRAKE SWITCH INSPECTION .) TR PID is not specified: Inspect the TR switch. (See TRANSAXLE RANGE (TR) SWITCH INSPECTION [AY6A-EL] .) Repair or replace the malfunctioning part according to the inspection results.
9	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.