Code No. P0170: Abnormal Fuel System (Cylinder 1, 4)

OPERATION

Refer to Code No. P0201: No. 1 Injector System .
Refer to Code No. P0204: No. 4 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 a specified range.

TROUBLE JUDGMENT

Check Condition

In learning the air-fuel ratio

Judgment Criteria

The correction value of fuel injection amount is too low for 5 seconds or more.

The correction value of fuel injection amount is too high for 5 seconds or more.

PROBABLE CAUSE

Failed fuel supply system
Failed cylinder 1, 4 oxygen sensor
Failed intake air temperature sensor
Failed engine coolant temperature sensor
Failed air flow sensor
Failed barometric pressure sensor
Air drawn in from intake hose and inlet manifold
Exhaust leak from exhaust manifold
Contamination of throttle body (throttle valve portion)
Failed No. 1 or No. 4 injector
Failed purge control solenoid valve
Failed EGR valve
Failed fuel pressure
Failed engine-ECU <M/T>
Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q. Is any other diagnosis code than P0170 output?

	Inspection chart for diagnosis code (Refer to ).

	Go to Step 2 .

STEP 2. M.U.T.-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

Q. Are the check results normal?

	Go to Step 3 .

	Perform the diagnosis code classified check procedure for the sensor that has shown an abnormal data value (Refer to Inspection Chart for Diagnosis Code ).

STEP 3: M.U.T.-III data list

Refer to Data List Reference Table .

Item 25: Barometric pressure sensor

Q. Is the check result normal?

	Go to Step 4 .

	Replace engine-ECU <M/T> or engine-A/T-ECU <A/T>.

STEP 4. Check throttle body (throttle valve portion) for contamination.

Q. Is the check result normal?

	Go to Step 5 .

	Clean throttle body (throttle valve portion) (Refer to ).

STEP 5. Check for intake of air from intake hose and inlet manifold.

Q. Is the check result normal?

	Go to Step 6 .

	Repair.

STEP 6. Check for leakage of exhaust emission from exhaust manifold.

Q. Is the check result normal?

	Go to Step 7 .

	Repair.

STEP 7. M.U.T.-III data list

Refer to Data List Reference Table .

Item 11: Cylinder 1, 4 oxygen sensor

Q. Is the check result normal?

	Go to Step 8 .

	Check cylinder 1, 4 oxygen sensor system (Refer to Code. No. P0130 ).

STEP 8. Check No. 1 and No. 4 injector itself.

Check No. 1 and No. 4 Injector itself (Refer to ).

Q. Is the check result normal?

	Go to Step 9 .

	Replace injector.

STEP 9. Check purge control solenoid valve itself.

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?

	Go to Step 10 .

	Replace purge control solenoid valve.

STEP 10. Check EGR valve itself.

Check EGR valve itself (Refer to GROUP 17 - Emission Control System - Exhaust Gas Recirculation (EGR) System - EGR Valve (stepper motor) Check ).

Q. Is the check result normal?

	Go to Step 11 .

	Replace EGR valve (stepper motor).

STEP 11. Fuel pressure measurement.

Fuel pressure measurement (Refer to Fuel Pressure Test ).

Q. Is the check result normal?

	Replace engine-ECU <M/T> or engine-A/T-ECU <A/T>.

	Repair.