Nissan Frontier. Manual - part 447

 

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Nissan Frontier. Manual - part 447

 

 

P117A AIR FUEL RATIO

EC-359

< DTC/CIRCUIT DIAGNOSIS >

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• 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 cruising.

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-359, "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 cruising.

3. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-359, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009481042

1.

CHECK FOR INTAKE AIR LEAK

1. Stop engine and check the following for connection.

-

Air duct

-

Vacuum hoses

-

PCV hose

-

Intake air passage between air duct to intake manifold

2. Start engine and let it idle.

3. Listen for an intake air leak after the mass air flow sensor.
Is the inspection result normal?

ENG SPEED

1,200 – 1,900rpm

COOLAN TEMP/S

More than 80

°C (176°F)

B/FUEL SCHDL

A/T: 5 – 10 msec
M/T: 4 – 10 msec

Selector lever

A/T: D position
M/T: Top gear position

SYSTEM 1 DIAGNOSIS B B1

PRSENT

Engine speed

1,200 – 1,900rpm

Calculated load value

A/T: 23 – 63 %
M/T: 19 – 63 %

Selector lever

A/T: D position
M/T: Top gear position

EC-360

< DTC/CIRCUIT DIAGNOSIS >

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P117A AIR FUEL RATIO

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?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK FUEL PRESSURE

1. Release fuel pressure to zero. Refer to 

EC-466, "Fuel Pressure Check"

.

2. Check fuel pressure. Refer to 

EC-466, "Fuel Pressure Check"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 9.

4.

CHECK MASS AIR FLOW SENSOR

With CONSULT

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

For specification, refer to 

EC-471, "Mass Air Flow Sensor"

.

With GST

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

For specification, refer to 

EC-471, "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-169, "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.

Without CONSULT

1. Let engine idle.

PBIB1216E

P117A AIR FUEL RATIO

EC-361

< DTC/CIRCUIT DIAGNOSIS >

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2. Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Perform trouble diagnosis for fuel injector, refer to 

EC-

439, "Diagnosis Procedure"

.

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-39, "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-39, "Removal and

Installation"

.

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.

3. Start the engine.

4. After an engine stall, crank the engine two or three times to release all the fuel pressure. 

5. Turn ignition switch OFF.

6. Disconnect all the harness connectors of ignition coil to prevent electric discharge from occurring in igni-

tion coil.

7. Remove ignition coil assembly and spark plug of cylinder. Refer to 

EM-36, "Removal and Installation"

.

8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.

9. Connect spark plug and harness connector to ignition coil.

Clicking noise should be heard.

PBIB3332E

• Fuel should be sprayed evenly for each fuel injector.
• Fuel must not drip from the tip of fuel injector.

PBIA9666J

EC-362

< DTC/CIRCUIT DIAGNOSIS >

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P117A AIR FUEL RATIO

10. 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.

11. Crank the engine for approximately 3 seconds to see if sparking

occurs between spark plug and the grounded metal portion.

CAUTION:

• The discharge voltage becomes 20 kV or higher. There-

fore, always stay away from the spark plug and ignition

coil at least 50 cm (19.7 in) during the inspection.

• Leaving a space of more than 17mm (0.66 in) may damage

the ignition coil.

NOTE:

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

functioning.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 10.

8.

CHECK COMPRESSION PRESSURE

Check compression pressure. Refer to 

EM-23, "Compression Pressure"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "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-10, "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.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Check ignition coil, power transistor and their circuits. Refer to 

EC-446, "Diagnosis Procedure"

.

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-18,

"Removal and Installation"

.

2. GO TO 12.

NO

>> Replace spark plug(s) with standard type one(s). For

spark plug type, refer to 

EM-108, "Standard and Limit"

.

12.

CHECK FUNCTION OF IGNITION COIL-3

1. Reconnect the initial spark plugs.

Spark should be generated.

JMBIA0066GB

Spark should be generated.

SEF156I

 

 

 

 

 

 

 

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