Nissan Sentra manuals

Nissan Sentra Service Manual: 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-94, "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.

2.PRECONDITIONING-2

  1. Turn ignition switch ON.
  2. Clear the mixture ratio self-learning value. Refer to EC-142, "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 “COOLANT TEMP/S” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
  3. Start engine.
  4. Make sure that “COOLANT TEMP/S” indicates more than 80°C (176°F).

>> 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:

NOTE:


NOTE:

  1. 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-364, "Diagnosis Procedure".

NO >> INSPECTION END

6.PERFORM DTC CONFIRMATION PROCEDURE-4

CONSULT 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:

NOTE:


NOTE:

  1. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-364, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK FOR INTAKE AIR LEAK

  1. Stop engine and check the following for connection.
  1. Start engine and let it idle.
  2. Listen for an intake air leak after the mass air flow sensor.

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace error-detected parts.

2.CHECK EXHAUST GAS LEAK

  1. Stop engine and visually check exhaust tube, three way catalyst and muffler for dents connection.
  2. Start engine and let it idle.
  3. Listen for an exhaust gas leak before three way catalyst (manifold).

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 3.

NO >> Repair or replace error-detected parts.

3.CHECK FUEL PRESSURE

  1. Release fuel pressure to zero. Refer to EC-143, "Work Procedure".
  2. Check fuel pressure. Refer to EC-143, "Work Procedure".

Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 9.

4.CHECK MASS AIR FLOW SENSOR

Check “MASS AIR FLOW” in “DATA MONITOR” mode of “ENGINE” using CONSULT. With CONSULT


Check “MASS AIR FLOW” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

For specification, refer to EC-486, "Mass Air Flow Sensor".

Check mass air flow sensor signal in Service $01 using GST. With GST


Check mass air flow sensor signal in Service $01 using GST.

For specification, refer to EC-486, "Mass Air Flow Sensor".

Is the inspection result normal? YES >> GO TO 5.

NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to EC-187, "Diagnosis Procedure".

5.CHECK FUNCTION OF FUEL INJECTOR-1

With CONSULT


  1. Start engine.
  2. Perform “POWER BALANCE” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
  3. Check that each circuit produces a momentary engine speed drop.

CONSULT Without
CONSULT

  1. Let engine idle.
  2. Listen to each fuel injector operating sound.

Clicking noise should be heard.

Is the inspection result normal? YES >> GO TO 6.

NO >> Perform trouble diagnosis for fuel injector, refer to EC- 450, "Component Function Check".

6.CHECK FUNCTION OF FUEL INJECTOR-2


6.CHECK FUNCTION OF FUEL INJECTOR-2

CAUTION:

Perform the following procedure in a place with no combustible objects and good ventilation.

  1. Turn ignition switch OFF
  2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
  3. Disconnect all fuel injector harness connectors.
  4. Remove fuel tube assembly. Refer to EM-40, "Removal and Installation".

    Keep fuel hose and all fuel injectors connected to fuel tube.

  5. Disconnect all ignition coil harness connectors.
  6. Prepare pans or saucers under each fuel injector.
  7. Crank engine for approximately 3 seconds.

Is the inspection result normal? YES >> GO TO 7.

NO >> Replace fuel injector. Refer to EM-40, "Removal and Installation".

7.CHECK FUNCTION OF IGNITION COIL-1


7.CHECK FUNCTION OF IGNITION COIL-1

CAUTION:

Perform the following steps in a well-ventilated area with no combustibles.

  1. Turn ignition switch OFF.
  2. Remove fuel pump fuse from IPDM E/R to release fuel pressure.

NOTE:

CONSULT must not be used to release fuel pressure. It develops again during the following steps, if released by using CONSULT.

  1. Start the engine.
  2. After an engine stall, crank the engine two or three times to release all the fuel pressure.
  3. Turn ignition switch OFF.
  4. Disconnect all the harness connectors of ignition coil to prevent electric discharge from occurring in ignition coil.
  5. Remove ignition coil assembly and spark plug of cylinder. Refer to EM-45, "Removal and Installation".
  6. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
  7. Connect spark plug and harness connector to ignition coil.
  8. Allow a 13-17mm (0.52-0.66 in) spacing between spark plug and grounded metal portion as shown in the figure to fix the ignition coil with a rope or an equivalent.
  9. Crank the engine for approximately 3 seconds to see if sparking occurs between spark plug and the grounded metal portion.

Spark should be generated.

CAUTION:

NOTE:


NOTE:

When the gap is less than 13 mm (0.52 in), a the spark might be generated even if the coil is malfunctioning.

Is the inspection result normal? YES >> GO TO 8.

NO >> GO TO 10.

8.CHECK COMPRESSION PRESSURE

Check compression pressure. Refer to EM-23, "Inspection".

Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

9.DETECT MALFUNCTIONING PART

Check fuel hoses and fuel tubes for clogging.

Is the inspection result normal? YES >> Replace fuel filter and fuel pump assembly. Refer to FL-6, "Removal and Installation".

NO >> Repair or replace error-detected parts.

10.CHECK FUNCTION OF IGNITION COIL-2

  1. Turn ignition switch OFF.
  2. Disconnect spark plug and connect a non-malfunctioning spark plug.
  3. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.

Spark should be generated.

Is the inspection result normal? YES >> GO TO 11.

NO >> Check ignition coil, power transistor and their circuits. Refer to EC-456, "Component Function Check".

11.CHECK SPARK PLUG

Check the initial spark plug for fouling, etc.

Is the inspection result normal? YES >> 1. Repair or clean spark plug. Refer to EM-45, "Removal and Installation".

2. GO TO 12.

NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-118, "Spark Plug".

12.CHECK FUNCTION OF IGNITION COIL-3


12.CHECK FUNCTION OF IGNITION COIL-3

  1. Reconnect the initial spark plugs.
  2. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded portion.

Spark should be generated

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-118, "Spark Plug".

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