Diagnostic Procedure

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

STEP	INSPECTION	RESULTS	ACTION
1	INSPECT COOLING SYSTEM FOR MALFUNCTION Access the PCM PID ECT using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Verify the ECT PID is less than 116 °C {241 °F} during driving. Is the ECT PID less than specification?	Yes	Go to the next step.
1		No	Inspect the CHT sensor. (See CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION .) If the CHT sensor is normal, inspect the cooling system for cause of overheating. Repair or replace the malfunctioning part according to the inspection results.
2	INSPECT IAT SENSOR AND MAF SENSOR SIGNALS 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 .) IAT MAF Do the PIDs indicate the correct values under trouble condition? (See PCM INSPECTION .)	Yes	Go to the next step.
2		No	IAT PID is not specified: Inspect the IAT sensor. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION .) MAF PID is not specified: Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION .) Repair or replace the malfunctioning part according to the inspection results.
3	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 .)
3		No	No DTC is displayed: Go to the next step.
4	INSPECT ENGINE COMPRESSION Is the engine compression correct?	Yes	Go to the next step.
4		No	Inspect for cause. Repair or replace the malfunctioning part according to the inspection results.
5	INSPECT CKP SENSOR Inspect the CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR 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	INSPECT CMP SENSOR Inspect the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
6		No	Go to the next step.
7	INSPECT FUEL LINE PRESSURE Install the fuel pressure gauge between the fuel pipe and fuel distributor. Start the engine and idle it. Measure the fuel line pressure during idle. (See FUEL LINE PRESSURE INSPECTION .) Is the fuel line pressure correct during idle?	Yes	Go to the next step.
7		No	Zero or low: Inspect for the following: Fuel pump relay Fuel pump circuit Fuel line for clogging If there is no malfunction, replace the fuel pump unit. (Fuel pump or pressure regulator malfunction) (See FUEL PUMP UNIT REMOVAL/INSTALLATION .) High: Replace the fuel pump unit. (Pressure regulator malfunction) (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
8	INSPECT KS Inspect the KS. (See KNOCK SENSOR (KS) INSPECTION .) Is there any malfunction?	Yes	Replace the KS. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION .)
8		No	Go to the next step.
9	INSPECT IGNITION TIMING Inspect the ignition timing. (See ENGINE TUNE-UP .) Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
9		No	Replace the fuel.
10	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.