Code No. P0170: Abnormal Fuel System






OPERATION



  • Refer to Code No. P0201: No. 1 Injector System .
  • Refer to Code No. P0202: No. 2 Injector System .
  • Refer to Code No. P0203: No. 3 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 checks whether the fuel trim value is within a specified range.

TROUBLE JUDGMENT


Check Condition
  • Engine: In learning the air-fuel ratio
Judgment Criterion
  • 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.

FAIL-SAFE AND BACKUP FUNCTION



  • None

PROBABLE CAUSES



  • Failed fuel supply system
  • Failed oxygen sensor (front)
  • Failed intake air temperature sensor
  • Failed engine coolant temperature sensor
  • Failed manifold absolute pressure sensor
  • Air drawn in from inlet hose and inlet manifold
  • Exhaust leak from exhaust manifold
  • Contamination of throttle body (throttle valve portion)
  • Failed injector
  • Failed purge control solenoid valve
  • Failed fuel pressure
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

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

Q. Is diagnosis code set except P0170?
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 .

  1. Item 5: Intake air temperature sensor
  2. Item 6: Engine coolant temperature sensor
  3. Item 8: Manifold absolute pressure 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. Check air intake from inlet hose and inlet manifold.

Q. Is the check result normal?
Go to Step 4 .
Repair.

STEP 4. Check exhaust leak from exhaust manifold.

Q. Is the check result normal?
Go to Step 5 .
Repair.

STEP 5. Check throttle body (throttle valve portion) contamination.

Q. Is the check result normal?
Go to Step 6 .
Clean throttle body (throttle valve portion) (Refer to ).

STEP 6. M.U.T.-III data list

  • Refer to Data List Reference Table .

  1. Item AC: Oxygen sensor (front)

Q. Is the check result normal?
Go to Step 7 .
Check oxygen sensor (front) system (Refer to Code No. P0130 <M/T> or P0130 <A/T> ).

STEP 7. Connector Check: Injector connector

  1. B-101 (No. 1 injector connector).
  2. B-102 (No. 2 injector connector).
  3. B-103 (No. 3 injector connector).
  4. B-104 (No. 4 injector connector).

Q. Are the check results normal?
Go to Step 8 .
Repair or replace the connector.

STEP 8. Check injector itself.

  • Check injector itself (Refer to ).

Q. Is the check result normal?
Go to Step 9 .
Replace the injector.

STEP 9. Connector check: B-08 engine-ECU connector

Q. Is the check result normal?
Go to Step 10 .
Repair or replace the connector.

STEP 10. Check harness between injector connector and engine-ECU connector.

  1. Check and repair harness between B-101 (terminal No. 2) No. 1 injector connector and B-08 (terminal No. 2) engine-ECU connector.
  2. Check and repair harness between B-102 (terminal No. 2) No. 2 injector connector and B-08 (terminal No. 3) engine-ECU connector.
  3. Check and repair harness between B-103 (terminal No. 2) No. 3 injector connector and B-08 (terminal No. 18) engine-ECU connector.
  4. Check and repair harness between B-104 (terminal No. 2) No. 4 injector connector and B-08 (terminal No. 19) engine-ECU connector.

  • Check output line for damage.

Q. Are the check result normal?
Go to Step 11 .
Repair the damaged harness wire.

STEP 11. Check purge control solenoid valve itself.

  • Check purge control solenoid valve itself (Refer to GROUP 17 - Emission Control <MPI> - Purge Control Solenoid Valve Check ).

Q. Is the check result normal?
Go to Step 12 .
Replace the purge control solenoid valve.

STEP 12. Fuel pressure measurement.

  • Fuel pressure measurement (Refer to ).

Q. Is the check result normal?
Go to Step 13 .
Repair.

STEP 13. Check for entry of foreign matter (water, diesel fuel, etc.) into fuel.

Q. Is the check result normal?
Go to Step 14 .
Replace the fuel.

STEP 14. Replace the injector.

  • After replacing the injector, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?
Replace the engine-ECU.
Check end.