[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P0170: Abnormal Fuel System <DOHC> | PRINT PAGE / INDEX / PRIOR / NEXT

Code No. P0170: Abnormal Fuel System <DOHC>
function If the fuel system goes out of order, the fuel correction value will become larger. The engine-A/T-ECU checks whether the fuel correction value is within the standard limits.
TROUBLE JUDGMENT Check Condition Engine: Learning air-fuel ratio Judgment Criterion Fuel injection amount correction value remains unusually low for more than 5 seconds, or Fuel injection amount correction value remains unusually high for more than 5 seconds.
PROBABLE CAUSE Failed fuel supply system Failed oxygen sensor Failed intake air temperature sensor Failed air flow sensor Failed purge control solenoid valve Failed engine-A/T-ECU
| DIAGNOSIS PROCEDURE
| STEP 1. MUT-II/III self-diag code Q: Is any other diagnosis code than P0170 output? YES: Inspection Chart for Diagnosis Code (Refer to ). NO: Go to Step 2 .
| STEP 2. MUT-II/III data list Refer to Data list reference table . Item 12: Air flow sensor Item 13: Intake air temperature sensor Item 21: Engine coolant temperature sensor Item 22: Barometric pressure sensor Q: Are the check results normal? YES: Go to Step 3 . NO: Perform the Diagnosis Code Classified Check Procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Codes ).
| STEP 3. Check for intake of air from intake hose and intake manifold. Q: Is the check result normal? YES: Go to Step 4 . NO: Repair.
| STEP 4. Check for leakage of exhaust emission from exhaust manifold. Q: Is the check result normal? YES: Go to Step 5 . NO: Repair.
| STEP 5. Check throttle body (throttle valve portion) for contamination. Q: Is the check result normal? YES: Go to Step 6 . NO: Clean throttle body (throttle valve portion) (Refer to ).
| STEP 6. MUT-II/III data list Refer to Data list reference table . Item 11: Oxygen sensor Q: Is the check result normal? YES: Go to Step 7 . NO: Check oxygen sensor system (Refer to Code No. P0130 ).
| STEP 7. Check injector itself. Check Injector itself (Refer to ). Q: Is the check result normal? YES: Go to Step 8 . NO: Replace injector.
| STEP 8. Check purge control solenoid valve itself. Check purge control solenoid valve itself [Refer to GROUP 17 - Emission Control System - Evaporative Emission Control System ]. Q: Is the check result normal? YES: Go to Step 9 . NO: Replace purge control solenoid valve.
| STEP 9. Measure fuel pressure. Measure fuel pressure (Refer to ). Q: Is the check result normal? YES: Replace engine-A/T-ECU. NO: Repair.

[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P0170: Abnormal Fuel System <DOHC> | PRINT PAGE / INDEX / PRIOR / NEXT

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