Nissan Frontier D22. Manual - part 281

 

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Nissan Frontier D22. Manual - part 281

 

 

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

EC-227

[KA24DE]

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D

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F

G

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EC

Wiring Diagram

UBS00D52

BBWA0441E

EC-228

[KA24DE]

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

Diagnostic Procedure

UBS00D53

1. 

CHECK EXHAUST GAS LEAK

1.

Start engine and run it at idle.

2.

Listen for an exhaust gas leak before three way catalyst (manifold).

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace.

2. 

CHECK FOR INTAKE AIR LEAK AND PCV HOSE

1.

Listen for an intake air leak between the mass air flow sensor and the intake manifold.

2.

Check PCV hose connection.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace.

3. 

CHECK HEATED OXYGEN SENSOR 1 CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 1 harness connector and
ECM harness connector.

3.

Check harness continuity between ECM terminal 50 and HO2S1
terminal 2.
Refer to Wiring Diagram.

4.

Check harness continuity between ECM terminal 50 or HO2S1
terminal 2 and ground.
Refer to Wiring Diagram.

5.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

SEC502D

Continuity should exist.

Continuity should not exist. 

BBIA0430E

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

EC-229

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EC

4. 

CHECK FUEL PRESSURE

1.

Release fuel pressure to zero.
Refer to 

EC-46, "FUEL PRESSURE RELEASE"

 .

2.

Install fuel pressure gauge and check fuel pressure.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

Fuel pump and circuit (Refer to 

EC-548

 .)

Fuel pressure regulator (Refer to 

EC-48

 .)

Fuel lines (Refer to 

MA-18, "Changing Fuel Filter"

 .)

Fuel filter for clogging

>> Repair or replace.

6. 

CHECK MASS AIR FLOW SENSOR

Refer to 

EC-231, "Component Inspection"

OK or NG

OK

>> GO TO 7.

NG

>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

engine grounds. Refer to 

EC-143, "DTC P0102, P0103 MAF SENSOR"

 .

At idling

When fuel pressure regulator valve vacuum 
hose is connected.

235 kPa (2.4 kg/cm

2

 , 34 psi)

When fuel pressure regulator valve vacuum 
hose is disconnected.

294 kPa (3.0 kg/cm

2

 , 43 psi)

EC-230

[KA24DE]

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

7. 

CHECK FUNCTION OF INJECTORS

 With CONSULT-II

1.

Install all parts removed.

2.

Start engine.

3.

Perform  “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.

4.

Make sure that each circuit produces a momentary engine
speed drop.

 Without CONSULT-II

1.

Install all parts removed.

2.

Start engine.

3.

Listen to each injector operating sound.
Clicking noise should be heard.

OK or NG

OK

>> GO TO 8.

NG

>> Perform trouble diagnosis for injector, refer to 

EC-539,

"INJECTOR CIRCUIT"

 .

8. 

REMOVE INJECTOR

1.

Confirm that the engine is cooled down and there are no fire hazards near the vehicle.

2.

Turn ignition switch OFF.

3.

Remove injector with fuel tube assembly.
Keep fuel hose and all injectors connected to injector gallery. The injector harness connectors should
remain connected.

>> GO TO 9.

9. 

CHECK INJECTOR

Refer to 

EC-231, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Replace injectors from which fuel does not spray out. Always replace O-ring with new one.

10. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

SEF981Z

MEC703B

 

 

 

 

 

 

 

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