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MPI – Troubleshooting 13-32 INSPECTION PROCEDURE 17 The feeling of impact or vibration when decelerating Probable cause Malfunction of the ISC servo system is suspected. D Malfunction of the ISC servo system MUT- II Self-Diag code Are diagnosis codes displayed? Yes Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES. No Check the ISC servo for operation sound. NG Check the ISC servo system. OK MUT- II Data list 14 Throttle position sensor (Refer to P.13-57.) NG Check the throttle position sensor system. (Refer to P.13-9, IN- OK MUT- II Data list 26 Idle position switch (Refer to P.13-58.) NG Check the idle position switch system. OK Clean the throttle valve area. INSPECTION PROCEDURE 18 Poor acceleration Probable cause Defective ignition system, abnormal air-fuel ratio, poor compression pressure, etc. D Malfunction of the ignition system D Malfunction of air-fuel ratio control system D Malfunction of the fuel supply system D Poor compression pressure D Clogged exhaust system D Malfunction of the turbocharger system MUT- II Self-Diag code Are diagnosis codes displayed? Yes Refer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES. No Check the injectors for operation sound. NG Check the injector system. (Refer to P.13-15, INSPECTION PRO- OK Check the ignition timing. NG Check that the crank angle sensor and the timing belt cover are OK MUT- II : Check if hesitation, sag, stumble or poor acceleration occur. (Refer to P.13-51, INSPECTION PROCEDURE 43.) OK Check the fuel pressure. (Refer to P.13-30.)* OK Check the following items. D Check the ignition coil, spark plugs, spark plug cables. D Check the turbocharger boost pressure. D Check the boost pressure control system. D Check the turbocharger turbine wheel for smooth rotation. D Check the compression pressure. D Check the fuel filter or fuel line for clogging. D Broken air intake hose D Clogged air cleaner D Clogged exhaust system NOTE Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9). |