Diagnostic Procedure

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 Inspect the following: Proper routing of and no damage to the vacuum lines No air leakage from the intake air system Engine mount loose Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
3		No	Go to the next step.
4	VERIFY PCM DTC Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
4		No	Go to the next step.
5	INSPECT DRIVE-BY-WIRE CONTROL SYSTEM OPERATION Perform the Drive-by-wire Control System Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
5		No	Go to the next step.
6	DETERMINE IF MALFUNCTION CAUSE IS EVAP CONTROL SYSTEM OR OTHER Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side. Plug the open end of the vacuum hose. Drive the vehicle. Does the engine condition improve?	Yes	Inspect the EVAP control system. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) 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 PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST .) APP1 APP2 BOO TP1 TP2 MAF O2S11 VSS Do the PIDs indicate the correct values under the trouble condition? (See PCM INSPECTION .)	Yes	Go to the next step.
7		No	APP1, APP2 PIDs are not as specified: Inspect the APP sensor. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION .) BOO PID is not as specified: Inspect the brake switch. (See BRAKE SWITCH INSPECTION .) TP1, TP2 PIDs are not as specified: Inspect the TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION .) MAF PID is not as specified: Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION .) O2S11 PID is not as specified: Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION .) VSS PID is not as specified: Inspect the VSS. (See VEHICLE SPEED SENSOR (VSS) INSPECTION .) Repair or replace the malfunctioning part according to the inspection results.
8	VERIFY CURRENT INPUT SIGNAL STATUS Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST .) (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION .) AC_REQ CPP (MTX) CPP/PNP (MTX) TR (ATX) Are the PID values normal? (See PCM INSPECTION .)	Yes	ATX: Inspect the TCC operation. (See NO.25 ENGINE STALLS WHEN DRIVING AT SLOW SPEEDS OR STOPPING .) If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. MTX: Go to the next step.
8		No	AC_REQ PID is not as specified: Inspect the refrigerant pressure sensor, evaporator temperature sensor and fan switch. (See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER] .) (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER] .) CPP PID is not as specified: (MTX) Inspect the CPP switch. (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION .) CPP/PNP PID is not as specified: (MTX) Inspect the neutral switch. (See NEUTRAL SWITCH INSPECTION .) TR PID is not as specified: (ATX) Inspect the TR switch. (See TRANSAXLE RANGE (TR) SWITCH INSPECTION .) Inspect communication error between TCM and PCM. Repair or replace the malfunctioning part according to the inspection results.
9	Verify test results. If normal, return to the diagnostic index to service any additional symptoms. (See ENGINE CONTROL SYSTEM SYMPTOM DIAGNOSTIC INDEX .) If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If the vehicle is repaired, troubleshooting is completed. If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.