Diagnostic procedure

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

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Verify the following: Vacuum connection Air cleaner element No air leakage from intake-air system No restriction of intake-air system Proper sealing of intake manifold and components attached to intake manifold; such as EGR valve Fuel quality (e.g. proper octane, contamination, winter/summer blend) Are all items normal?	Yes	Go to the next step.
1		No	Service if necessary. Repeat Step 1.
2	Connect WDS or equivalent to DLC-2. Turn ignition switch to ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	DTC is displayed: Go to appropriate DTC test.
2		No	No DTC is displayed: Go to the next step.
3	Is engine overheating?	Yes	Go to symptom troubleshooting "NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING ".
3	Is engine overheating?	No	Go to the next step.
4	Connect WDS or equivalent to DLC-2. Access the following PCM PIDs. APP1 APP2 RPM VPWR MAF TP_REL VSS Drive the vehicle with monitoring PIDs. Are the PID values within specified?	Yes	Go to the next step.
4		No	If APP1, APP2 PIDs is not specified: Inspect if output signal accelerator position sensor changes smoothly. If RPM PID is not specified: Inspect CKP sensor and related wiring harness for vibration or intermittent open/short circuit or both. If MAF PID is not specified: Inspect for intermittent open circuit of MAF sensor and related wiring harness. If TP_REL PID is not specified: Inspect if output signal TP sensor changes smoothly. If VSS PID is not specified: Inspect for intermittent open circuit of VSS and related wiring harness.
5	Visually inspect CKP sensor and teeth of crankshaft pulley. Are CKP sensor and teeth of crankshaft pulley normal?	Yes	Go to the next step.
5		No	Replace malfunctioning parts.
6	Inspect spark plug condition. 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. Inspect spark plug and ignition coil related harness. Spark plug is grayish white: Inspect for clogged fuel injector.
6		No	Install spark plugs on original cylinders. Go to the next step.
7	Remove and shake PCV valve. Does PCV valve rattle?	Yes	Go to the next step.
7	Remove and shake PCV valve. Does PCV valve rattle?	No	Replace PCV valve.
8	Perform electronic throttle control system operation inspection. (See ELECTRONIC THROTTLE CONTROL SYSTEM INSPECTION ). Does electronic throttle control system work properly?	Yes	Go to the next step.
8		No	Repair or replace malfunctioning part according to electronic throttle control system operation inspection results.
9	Inspect for restriction in exhaust system. Is there any restriction?	Yes	Inspect exhaust system.
9		No	Go to the next step.
10	Install fuel pressure gauge between fuel pipe and fuel distributor. Short check connector terminal F/P to body GND using a jumper wire. Turn ignition switch to ON position. Is fuel line pressure correct with ignition switch to ON position? (See FUEL LINE PRESSURE INSPECTION ).	Yes	Go to the next step.
10		No	Zero or low: Inspect fuel pump relay and fuel pump circuit. Inspect for clogged fuel line. If okay, replace fuel pump unit. High: Replace fuel pump unit.
11	Inspect Variable tumble system operation. (See VARIABLE TUMBLE SYSTEM OPERATION INSPECTION ). Does Variable tumble system work properly?	Yes	Go to the next step.
11		No	Repair or replace malfunctioning parts.
12	Inspect Variable intake air system operation. (See VARIABLE INTAKE AIR SYSTEM OPERATION INSPECTION ). Does Variable intake air system work properly?	Yes	Go to the next step.
12		No	Repair or replace malfunctioning parts.
13	NOTE: The following test is for engine stalling with A/C on concern. If other symptoms exist, go to the next step. Connect pressure gauge to A/C low and high side pressure lines.Turn A/C on and measure low side and high side pressures.Are pressures within specifications?(See REFRIGERANT PRESSURE CHECK [L3, AJ] ).	Yes	Go to the next step.
13		No	If A/C is always on, go to symptom troubleshooting "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
14	Inspect for A/C cut-off operation. (See A/C CUT-OFF CONTROL SYSTEM INSPECTION ). Does A/C cut-off work properly?	Yes	Go to the next step.
14		No	Inspect A/C cut-off system components.
15	Disconnect vacuum hose between purge solenoid valve and intake manifold from purge solenoid valve side. Plug opening end of vacuum hose. Drive vehicle. Does engine condition improve?	Yes	Inspect if purge solenoid valve is stuck open mechanically. Inspect EVAP control system.
15		No	Go to the next step.
16	Visually inspect CMP sensor and projections of camshaft pulley. Are CMP sensor and projections of camshaft pulley normal?	Yes	Go to the next step.
16		No	Replace malfunctioning parts.
17	Inspect EGR system. (See EGR CONTROL SYSTEM INSPECTION ). Is EGR system normal?	Yes	Go to the next step.
17		No	Replace malfunctioning parts according to EGR control system operation inspection results.
18	Inspect variable valve timing control system operation. (See VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION INSPECTION ). Does variable valve timing control system work properly?	Yes	Go to the next step.
18		No	Repair or replace malfunctioning parts according to variable valve timing control system inspection results.
19	Is engine compression correct?	Yes	Inspect the following: Valve timing Internal transaxle components (ATX) Clutch (MTX) Brake system for dragging
19	Is engine compression correct?	No	Inspect for cause.
20	Verify test results. If okay, return to diagnostic index to service any additional symptoms. 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 PCM if later calibration is available. Retest.