Diagnostic procedure

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DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION	RESULTS	ACTION
1	CONFIRM DRIVE-BY-WIRE CONTROL SYSTEM OPERATES WITH BRAKE OVERRIDE SYSTEM Retrieve any continuous memory DTCs. (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 Verify the following: Vacuum connection Restriction in the intake air system (such as the air cleaner element, fresh air duct) No air leakage from the intake air system No restriction of the intake air system Proper sealing of the intake manifold and components attached to the intake manifold: such as the EGR valve Fuel quality (such as proper octane, contamination, winter/summer blend) Are all the items normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning part according to the inspection results. Repeat Step 2.
3	VERIFY PCM DTC Retrieve arty DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Are there any DTCs displayed?	Yes	Go to the appropriate 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	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 white 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 RPM MAF TP REL IAT VSS Do the PIDs indicate correct values under the trouble condition? (See PCM INSPECTION .)	Yes	Go to the next step.
5		No	APP1, APP2 PIDs are not specified: Inspect If the output signal APP sensor changes smoothly. (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION .) TP REL PID is not specified: Inspect if the output signal TP sensor changes smoothly. (See THROTTLE POSITION (TP) SENSOR INSPECTION .) RPM PID is not specified: Inspect the CKP sensor and the related wiring harness for vibration or intermittent open/short circuit or both. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION .) MAF PID is not specified: Inspect for an intermittent open circuit of MAF sensor and the related wiring harness. (See MASS AIR FLOW (MAF) SENSOR INSPECTION .) IAT PID is not specified: Inspect for air suction in the intake air system. If normal, inspect for an intermittent short circuit in the IAT sensor and related wiring harnesses. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION .) VSS PID is not 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 result.
6	VISUALLY INSPECT CKP SENSOR AND PULSE WHEEL Visually inspect the CKP sensor and teeth of the crankshaft pulley. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION .) Are the CKP sensor and teeth of the crankshaft pulley normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning part according to the inspection result.
7	VERIFY SPARK PLUG CONDITION Verify the spark plug conditions when the spark plug removed in Step 8. (See SPARK PLUG INSPECTION .) Is 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 clogging. Repair or replace the malfunctioning part according to the inspection results.
7		No	Install the spark plugs on original cylinders. Go to the next step.
8	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.
8		No	Go to the next step.
9	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.
9		No	Repair or replace the malfunctioning part according to the inspection results.
10	INSPECT DEFORMED IN EXHAUST SYSTEM Visually inspect the exhaust system part. Is there any deformed exhaust system part?	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 INSPECTOR .) Is the fuel line pressure correct?	Yes	Go to the next step.
11		No	Zero or low: Inspect the following: Fuel pump relay Fuel pump circuit Fuel line for clogging If there is no malfunction, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
12	INSPECT VARIABLE TUMBLE CONTROL OPERATION Perform the variable tumble control operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Does the variable tumble control function properly?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning part according to the inspection results.
13	INSPECT VARIABLE INTAKE AIR CONTROL OPERATION Perform the variable intake air control operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Does the VIS function properly?	Yes	Go to the next step.
13		No	Repair or replace the malfunctioning part according to the inspection results.
14	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 specifications? (See REFRIGERANT PRESSURE CHECK .)	Yes	Go to the next step.
14		No	If the A/C is always on: Go to 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 Cooling fan operation Repair or replace the malfunctioning part according to the inspection results.
15	INSPECT A/C CUT-OFF CONTROL SYSTEM OPERATION Perform the A/C cut-off operation inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Does the A/C cut-off function properly?	Yes	Go to the next step.
15		No	Inspect the A/C cut-off system components. Repair or replace the malfunctioning part according to the inspection results.
16	DETERMINE IF MALFUNCTION CAUSE IS EVAP CONTROL SYSTEM OR OTHER CAUTION: While performing this step, always operate the vehicle in a safe and lawful manner. Disconnect the vacuum hose between purge solenoid valve and intake manifold from the purge solenoid valve side. Plug the open end of the vacuum hose. Drive the vehicle. Does the engine condition improve?	Yes	Inspect the following: If the purge solenoid valve is stuck open. EVAP control system Repair or replace the malfunctioning part according to the inspection results.
16		No	Go to the next step.
17	VISUALLY INSPECT CMP SENSOR AND PULSE WHEEL Visually inspect the CMP sensor and teeth of the camshaft. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION .) Are the CMP sensor and teeth of the camshaft normal?	Yes	Go to the next step.
17		No	Repair or replace the malfunctioning part according to the inspection results.
18	INSPECT EGR VALVE OPERATION Perform the EGR control system inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Is the EGR control system normal?	Yes	Go to the next step.
18		No	Repair or replace the malfunctioning part according to the inspection results.
19	INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Inspect the variable valve timing control system operation. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION .) Does the variable valve timing control system operate properly?	Yes	Go to the next step.
19		No	Repair or replace the malfunctioning part according to the inspection results.
20	INSPECT ENGINE COMPRESSION Is the engine compression correct? (See COMPRESSION INSPECTION .)	Yes	Go to the next step.
20		No	Inspect for cause. Repair or replace the malfunctioning part according to the inspection results.
21	INSPECT IF MALFUNCTION CAUSE IS PCV VALVE OR VALVE TIMING Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION .) Is the PCV valve normal?	Yes	Inspect the following: Valve timing Internal transaxle part (ATX) Brake system for dragging Repair or replace the malfunctioning part according to the inspection results.
21		No	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 .)
22	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.