Nissan Frontier D22. Manual — part 281
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-227
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Wiring Diagram
UBS00D52
BBWA0441E
EC-228
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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
.)
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Fuel pressure regulator (Refer to
●
Fuel lines (Refer to
●
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
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
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
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
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
SEF981Z
MEC703B
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