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M162 ENGINE CONTROLS 1F1 -- 35 DAEWOO MY_2000 KAB1F180 Failure Code Description Trouble Area Maintenance Hint 68 Random / Multiple Misfire When detection misfire of multiple cylinder for source of over the emission threshold or catalyst damage D Inspection the ignition system D Inspection the injection system D Inspection the fuel pressure D Inspection the compression pressure D Inspection the valve timing or clearance D Inspection the air flow sensor D Inspection the crankshaft position sensor and air gap D Inspection the engine wiring system D Inspection the Engine Control Module (ECM) Circuit Description The ECM monitors the crankshaft and camshaft positions to detect if the engine is misfiring. The ECM looks for a quick drop in crankshaft speed. Misfire multiple cylinder is monitored by engine roughness measuring. The actual roughness value is compared with the actual (emission and catalyst damage) threshold. |