Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	CONFIRM DRIVE-BY-WIRE CONTROL SYSTEM OPERATES WITH BRAKE OVERRIDE SYSTEM Retrieve the PCM DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Is the DTC P2299:00 present?	Yes	Go to the applicable DTC inspection. (Drive-by-wire control system operates with brake override system.) (See DTC P2299:00 .)
1		No	Go to the next step.
2	INSPECT RELATED PART CONDITION Inspect the following: Air cleaner element Clutch slippage (MTX) Electrical connections Fuel quality (such as proper octane, contamination, winter/summer blend) Ignition wiring No air leakage from intake air system No restriction of the intake air system Proper sealing of intake manifold and components attached to intake manifold: such as EGR valve Smooth operation of the throttle valve Vacuum connection Engine mount installation Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 2.
2		No	Go to the next step.
3	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 .)
3		No	Go to the next step.
4	VERIFY IF MALFUNCTION CAUSE IS OVERHEATING Is the engine overheating?	Yes	Go to the symptom troubleshooting "NO.17 COOLING SYSTEM CONCERNS-OVERHEATING". (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING .)
4		No	Go to the next step.
5	INSPECT THROTTLE BODY FOR CLOGGING Visually inspect the throttle valve. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .) Are any foreign material adhere to around throttle valve?	Yes	Clean the throttle valve.
5		No	Go to the next step.
6	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 TP1 TP2 RPM MAF MAP BARO VPWR VSS Do the PIDs indicate the correct values under the trouble condition? (See PCM INSPECTION .)	Yes	Go to the next step.
6		No	APP1, APP2 PIDs are not as specified: Inspect if the output signal from the APP sensor changes smoothly. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION .) TP1, TP2 PIDs are not as specified: Inspect if the output signal from the TP sensor changes smoothly. (See THROTTLE POSITION (TP) SENSOR INSPECTION .) RPM PID is not as specified: Inspect the CKP sensor and related wiring harness for vibration or an intermittent open/short circuit. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION .) MAF PID is not as specified: Inspect for an intermittent open circuit of the MAF sensor and the related wiring harness. (See MASS AIR FLOW (MAF) SENSOR INSPECTION .) MAP PID is not as specified: Inspect the MAP sensor and related wiring harness for vibration or an intermittent open/short circuit. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION .) BARO PID is not as specified: Replace the PCM. (See PCM REMOVAL/INSTALLATION .) VPWR PID is not as specified: Inspect for an intermittent open circuit. VSS PID is not as specified: Inspect for an intermittent open circuit in the VSS and related wiring harness. (See VEHICLE SPEED SENSOR (VSS) INSPECTION .) Repair or replace the malfunctioning part according to the inspection results.
7	VISUALLY INSPECT CKP SENSOR AND PULSE WHEEL Visually inspect the CKP sensor and teeth of the crankshaft pulley. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
7		No	Go to the next step.
8	VERIFY SPARK PLUG CONDITION Inspect the spark plug condition. (See SPARK PLUG INSPECTION .) Is the spark plug wet, covered with carbon or grayish white?	Yes	Spark plug is wet or covered with carbon: Inspect for fuel leakage from fuel injector. Spark plug is grayish white: Inspect the fuel injector for restriction. Repair or replace the malfunctioning part according to the inspection results.
8		No	Install the spark plugs on original cylinders, then go to the next step.
9	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.
9		No	Go to the next step.
10	INSPECT EXHAUST SYSTEM Visually inspect the exhaust system part. (See ENGINE EXHAUST SYSTEM INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
10		No	Go to the next step.
11	INSPECT FUEL LINE PRESSURE Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION .) Is there any malfunction?	Yes	Zero or low: Inspect the fuel pump relay and the fuel pump circuit. (See RELAY INSPECTION .) Inspect the fuel line for restriction. If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. If there is no malfunction: Replace the fuel pump unit. (Pressure regulator or fuel pump malfunction) (See FUEL PUMP UNIT REMOVAL/INSTALLATION .) High: Replace the fuel pump unit. (Pressure regulator malfunction) (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
11		No	Go to the next step.
12	INSPECT FUEL SYSTEM FOR FUEL LEAKAGE Visually inspect for fuel leakage at the fuel injector O-ring and fuel line. Is the fuel line pressure held after the ignition is off?	Yes	Go to the next step.
12		No	Inspect the fuel injector. (See FUEL INJECTOR INSPECTION .) If the fuel injector has malfunction: Replace the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION .) If the fuel injector is normal: Replace the fuel pump unit. (Check valve malfunction) (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
13	DETERMINE IF MALFUNCTION CAUSE IS A/C SYSTEM OR OTHER NOTE: The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step. Connect the pressure gauges to the A/C low side and high side pressure lines. Turn the A/C on and measure the low side and high side pressures. Are the pressures within the specification? (See REFRIGERANT PRESSURE CHECK .)	Yes	Go to the next step.
13		No	If the A/C is always on: 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 ) For other symptoms: Inspect the following: Refrigerant charging amount Condenser fan operation Repair or replace the malfunctioning part according to the inspection results.
14	INSPECT CRUISE CONTROL SYSTEM NOTE: The following test should be performed for symptoms with the cruise control on. If other symptoms exist, go to the next step. Inspect the cruise control system. Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
14		No	Go to the next step.
15	INSPECT CURRENT A/F SENSOR SIGNAL Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION .) Is there any malfunction?	Yes	Go to the next step.
15		No	Go to Step 17.
16	DETERMINE IF MALFUNCTION CAUSE IS A/F SENSOR MALFUNCTION OR A/F SENSOR RELATED WIRING HARNESS MALFUNCTION NOTE: If the inspection in Step 16 is performed, the PCM detects a DTC and performs fail-safe control. After performing the inspection, clear DTCs using the M-MDS. Switch the ignition to off. Disconnect the A/F sensor connector. Verify the symptom. Does the symptom disappear?	Yes	Replace the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION .)
16		No	Inspect the following: Exhaust gas leakage between exhaust manifold and A/F sensor Loose installation of A/F sensor If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results. If there is no malfunction: Inspect the A/F sensor signal circuit. Repair or replace the suspected wiring harness if necessary.
17	DETERMINE IF MALFUNCTION CAUSE IS FUEL SHUT-OFF VALVE OR OTHER Inspect the evaporative hose between the fuel tank and the purge solenoid valve. Does the fuel flow into the evaporative hose?	Yes	Inspect the fuel shut-off valve. (See FUEL TANK INSPECTION .) Repair or replace the malfunctioning part according to the inspection results.
17		No	Go to the next step.
18	DETERMINE IF MALFUNCTION CAUSE IS EVAP CONTROL SYSTEM OR OTHER Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side. Plug the open end of the vacuum hose. Switch the ignition to ON (engine off). Is the engine stall now eliminated?	Yes	Inspect the following: Purge solenoid valve (See PURGE SOLENOID VALVE INSPECTION .) EVAP control system (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Repair or replace the malfunctioning part according to the inspection results.
18		No	Go to the next step.
19	VISUALLY INSPECT CMP SENSOR AND PULSE WHEEL Visually inspect the CMP sensor and teeth of the camshaft. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
19		No	Go to the next step.
20	INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Perform the Variable Valve Timing Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
20		No	Go to the next step.
21	INSPECT EGR VALVE OPERATION Perform the EGR 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.
21		No	Go to the next step.
22	INSPECT ENGINE COMPRESSION Inspect the engine compression. (See COMPRESSION INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
22		No	Go to the next step.
23	INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR OTHER Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION .) Is there any malfunction?	Yes	Replace the PCV valve and the oil separator as a single unit, then go to the next step. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION .)
23		No	Inspect the following: Valve timing Internal transaxle part EGR valve (mechanical stuck) Engine mounts Check valve (two-way) Repair or replace the malfunctioning part according to the inspection results.
24	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.