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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) 13A-111 STEP 12. 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 Q: Is the check result normal? YES : Go to Step 13 . NO : Replace purge control solenoid valve. STEP 13. Fuel pressure measurement. • Fuel pressure measurement (Refer to Fuel Pressure Test ). Q: Is the check result normal? YES : Replace engine-ECU <M/T> or engine-A/T-ECU <A/T>. NO : Repair. Code No. P0173: Abnormal Fuel System (cylinder 2, 3) OPERATION • Refer to Code No. P0202 No. 2 Injector System . • Refer to Code No. P0203 No. 3 Injector System . FUNCTION • If the fuel system goes out of order, the fuel correction value will become larger. • The engine-ECU <M/T> or engine-A/T-ECU <A/T> checks whether the fuel trim value is within TROUBLE JUDGMENT Check Condition • In learning the air-fuel ratio Judgment Criteria • Long-term fuel trim has continued to be +12.5 % or higher for 10 seconds. Or • Long-term fuel trim has continued to be -12.5 % or lower for 10 seconds. PROBABLE CAUSE • Failed intake air temperature sensor • Failed air flow sensor • Failed purge control solenoid valve • Failed injector • Air drawn in from gaps in gasket, seals, etc. • Failed engine coolant temperature sensor • Failed barometric pressure sensor • Exhaust leak • Incorrect fuel pressure • Failed engine-ECU <M/T> • Failed engine-A/T-ECU <A/T> DIAGNOSIS PROCEDURE STEP 1. MUT-III diagnosis code Q: Is any other diagnosis code than P0173 output? YES : Inspection chart for diagnosis code (Refer to NO : Go to Step 2 . STEP 2. MUT-III data list • Refer to Data List Reference Table a. Item 12: Air flow sensor c. Item 21: Engine coolant temperature sensor Q: Are the check results normal? YES : Go to Step 3 . NO : Perform the diagnosis code classified check STEP 3: MUT-III data list • Refer to Data List Reference Table a. Item 25: Barometric pressure sensor Q: Is the check result normal? YES : Go to Step 4 . NO : Replace engine-ECU <M/T> or STEP 4. Check throttle body (throttle valve Q: Is the check result normal? YES : Go to Step 5 . NO : Clean throttle body (throttle valve portion) ). |