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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (FS)] 01–02B–72 Diagnostic procedure POSSIBLE CAUSE • CKP sensor malfunction • CMP sensor malfunction • Ignition coil malfunction • High-tension lead malfunction • MAF sensor contamination • Excess air suction in intake-air system (between MAF sensor and dynamic chamber) • Fuel pump malfunction • Fuel pressure regulator malfunction • Fuel line clogged • Fuel filter clogged • Fuel leakage in fuel line • Purge control solenoid valve malfunction • PCV valve malfunction • EGR valve malfunction • Vacuum hoses damages or improper connection • Related connector and terminal malfunction • Related wiring harness malfunction • Poor fuel quality DTC P0300 Random misfire detection STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN • Has FREEZE FRAME DATA been recorded? Yes Go to next step. No Record FREEZE FRAME DATA on repair order, then go to 2 VERIFY RELATED REPAIR INFORMATION • Check for related Service Bulletins availability. • Is any related repair information available? Yes Perform repair or diagnosis according to available repair information. • If vehicle is not repaired, go to next step. No Go to next step. 3 VERIFY RELATED PENDING CODE OR • Turn ignition key to OFF then start engine. • Verify related pending code or stored DTCs. • Are other DTCs present? Yes Go to appropriate DTC troubleshooting. (See 01–02B–15 DTC TABLE [FS].) No Go to next step. 4 VERIFY CURRENT INPUT SIGNAL STATUS • Access ECT, IAT, MAF, RPM, TP, and VS • Is there any signal that is far out of Yes Inspect suspected circuit and/or part according to inspection results. No Go to next step. 5 VERIFY CURRENT INPUT SIGNAL STATUS • Inspect same PIDs as in Step 4 while • Is there any signal which causes drastic Yes Inspect suspected circuit and/or part according to inspection results. No Go to next step. 6 INSPECT CMP SENSOR • Inspect CMP sensor. • Is CMP sensor okay? Yes Go to next step. No Inspect installation condition and damages on timing belt • If it is okay, replace CMP sensor. Then go to Step 23. 7 VERIFY CKP SENSOR INSTALLATION • Check CKP sensor for looseness. • Is CKP sensor loose? Yes Retighten CKP sensor, then go to Step 23. No Go to next step. 8 CHECK IGNITION COIL OPERATION AND • Verify blinking condition on each cylinders • Do all cylinders show blinking condition? Yes Go to Step 12. No Go to next step. 1712-1U-01G(01-02B).fm 72 ページ 2001年6月29日 金曜日 午後3時24分 |