Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P117A air fuel ratio
DTC Logic

DTC DETECTION LOGIC

NOTE: If DTC P117A is displayed with other DTC, first perform the trouble diagnosis for the other DTC. Refer to EC, "DTC Index".

DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause
P117A AIR FUEL RATIO B1 (AIR FUEL RATIO B1) ECM detects a lean/rich air fuel ratio state in any cylinder for a specified length of time.
  • Fuel injector
  • Exhaust gas leaks
  • Incorrect fuel pressure
  • Mass air flow sensor
  • Intake air leaks
  • Lack of fuel
  • Incorrect PCV hose connection
  • Improper spark plug
  • Insufficient compression
  • The fuel injector circuit is open or shorted ignition coil
  • The ignition signal circuit is open or shorted

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING-1

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.

NOTE: Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 2.

  1. 2.PRECONDITIONING-2
  2. Turn ignition switch ON.
  3. Clear the mixture ratio self-learning value. Refer to EC, "Work Procedure".

Will CONSULT be used?

YES >> GO TO 3.

NO >> GO TO 6.

3.PERFORM DTC CONFIRMATION PROCEDURE-1

  1. Turn ignition switch ON.
  2. Select "COOLAN TEMP/S" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
  3. Start engine.
  4. Make sure that "COOLAN TEMP/S" indicates more than 80C (176F).

>> GO TO 4.

4.PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

  1. Select "SYSTEM 1 DIAGNOSIS B B1" and "SYSTEM 1 DIAGNOSIS A B1" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
  2. Drive vehicle under the following conditions for at least 5 consecutive seconds.

CAUTION: Always drive vehicle at a safe speed.               

NOTE:

  • Drive the vehicle at approximately 88 km/h (55MPH) allows easy diagnosis.
  • Keep the accelerator pedal as possible during crusing.

    3.   Check "SYSTEM 1 DIAGNOSIS A B1" indication.

Is "CMPLT" displayed?

YES >> GO TO 5.

NO >> GO TO 2.

5.PERFORM DTC CONFIRMATION PROCEDURE-3

Check 1st trip DTC.

Is 1st trip DTC detected?

YES >> Proceed to EC, "Diagnosis Procedure".

NO >> INSPECTION END

6.PERFORM DTC CONFIRMATION PROCEDURE-4

Without CONSULT

  1. Start the engine and warm it up to normal operating temperature.
  2. Drive vehicle under the following conditions for at least 5 consecutive seconds.

CAUTION: Always drive vehicle at a safe speed.       

NOTE:

  • Drive the vehicle at approximately 88 km/h (55MPH) allows easy diagnosis.
  • Keep the accelerator pedal as possible during crusing.

    3.   Check 1st trip DTC.

Is 1st trip DTC detected?

YES >> Proceed to EC, "Diagnosis Procedure".

NO >> INSPECTION END

    More about «P117A air fuel ratio»:

    DTC Logic

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