|
|
TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) <4A9> 13A-262 Inspection Procedure 12: Hesitation, sag, poor acceleration, stumble, surge COMMENT ON TROUBLE SYMPTOM • Failure is possibly caused by failed ignition sys- tem, improper air-fuel ratio, improper compres- PROBABLE CAUSES • Failed air-fuel ratio control system • Failed ignition system • Failed fuel system • Failed intake and exhaust system • Failed exhaust gas cleaning system • Failed electronically controlled throttle valve sys- tem • Throttle valve fouled around • Improper compression pressure • Failed engine-ECU <M/T> or engine-CVT-ECU <CVT> DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III diagnosis code Q: Is the diagnosis code set? YES : Inspection chart for diagnosis code (Refer to NO : Go to Step 2 . STEP 2. Check injector for operating sound. • Check injector for operating sound (Refer to ). Q: Can operating sound be heard? YES : Go to Step 3 . NO : Check the injector system of the defective cylinder. (Refer to Code No. P0201: No. 1 Injector (Refer to Code No. P0202: No. 2 Injector (Refer to Code No. P0203: No. 3 Injector (Refer to Code No. P0204: No. 4 Injector STEP 3. M.U.T.-III data list • Refer to Data List Reference Table . a. Item 13: Intake air temperature sensor c. Item 21: Engine coolant temperature sensor d. Item 77: Accelerator pedal position sensor (sub) e. Item 78: Accelerator pedal position sensor (main) f. Item 79: Throttle position sensor (main) Q: Are the check results normal? YES : Go to Step 4 . NO : Perform the diagnosis code classified check STEP 4. Check purge control solenoid valve • Check purge control solenoid valve itself (Refer to GROUP 17 − Emission Control System − Evaporative Emission Control System − Purge Control Solenoid Valve Check ). Q: Is the check result normal? YES : Go to Step 5 <CVT> , go to Step 6 <M/T> . NO : Replace purge control solenoid valve. STEP 5. Check EGR valve (stepper motor) itself. • Check EGR valve (stepper motor) itself [Refer to GROUP 17 − Emission Control System − Exhaust Gas Recirculation (EGR) System − EGR Valve (Stepper Motor) Check ]. Q: Is the check result normal? YES : Go to Step 6 . NO : Replace EGR valve (stepper motor). STEP 6. M.U.T.-III data list • Refer to Data List Reference Table . a. Item 11: Oxygen sensor (front) Q: Are the check results normal? YES : Go to Step 7 . NO : Perform the diagnosis code classified check Main Index Group TOC |