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MPI – TROUBLESHOOTING 13A-50 Checking Procedure 10 Has the battery been disconnected recently? MUT-II/III Diagnosis Codes MUT-II/III Service Data MUT-II/III Service Data does ISC servo position drop to 0 ~ 2 step? Check throttle body for dirt (throttle valve area) Confirm fault symptoms Replace engine ECU After engine has warmed up, run in idling mode for about Diagnosis Code List (ref. P.13A-5) Code No.P0120: Throttle position sensor system check Code No. P.0500: Vehicle speed sensor system (ref. Clean throttle body (in area of throttle valve) * Refer to ’01–1 Lancer Evolution VII Workshop Manual (No.1036K02) Checking Procedure 11 MUT-II/III Diagnosis Codes Check ignition timing (ref. Chapter 11 – Engine To next page Diagnosis Code List (ref. P.13A-5) Check crank angle sensor and timing belt cover Engine stalling during deceleration Probable causes The probable causes are noted right. • ISC control system malfunction Pulsating/Discontinuous Combustion (hesitation, sag), Poor Probable causes The probable causes are noted right. • Air fuel ratio control system malfunction OK NO OK OK OK NG YES NO OK NO NG NG NG YES YES YES Finish |