Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	INSPECT COOLING SYSTEM FOR MALFUNCTION Access the ECT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Verify the ECT PID value is less than 116 °C {241 °F} during driving. Is the ECT PID value less than the specification?	Yes	Go to the next step.
1		No	Go to the symptom troubleshooting "NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING". (See NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING .)
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 IAT and MAF PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .) Do the PIDs indicate the correct values under the trouble condition? (See PCM INSPECTION .)	Yes	Go to the next step.
2		No	IAT PID is not as specified: Inspect the IAT sensor. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION .) MAF PID is not as 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 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	INSPECT CMP SENSOR INSTALLATION Inspect the CMP sensor installation. Is the CMP sensor installed properly?	Yes	Go to the next step.
4		No	Install the CMP sensor properly. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION .)
5	INSPECT CKP SENSOR AND PULSE WHEEL Inspect the CKP sensor and crankshaft pulley installation. Are CKP sensor and crankshaft pulley installed properly?	Yes	Go to the next step.
5		No	Install the CKP sensor and/or crankshaft pulley properly. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION .)
6	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.
6		No	Go to the next step.
7	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 .)
7		No	Go to the next step.
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 MECHANICAL 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 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.