Nissan Pathfinder (2005 year). Instruction — part 162
TROUBLE DIAGNOSIS
EC-147
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2005 Pathfinder
PBIB1594E
EC-148
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
2005 Pathfinder
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
PFP:00031
Description
UBS00K4G
The specification (SP) value indicates the tolerance of the value that is displayed in “DATA MONITOR (SPEC)”
mode of CONSULT-II during normal operation of the Engine Control System. When the value in “DATA MONI-
TOR (SPEC)” mode is within the SP value, the Engine Control System is confirmed OK. When the value in
“DATA MONITOR (SPEC)” mode is NOT within the SP value, the Engine Control System may have one or
more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:
●
B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor-
rection)
●
A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
●
MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)
Testing Condition
UBS00K4H
●
Vehicle driven distance: More than 5,000 km (3,017 miles)
●
Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm
2
, 14.25 - 15.12 psi)
●
Atmospheric temperature: 20 - 30
°
C (68 - 86
°
F)
●
Engine coolant temperature: 75 - 95
°
C (167 - 203
°
F)
●
Transmission: Warmed-up*
1
●
Electrical load: Not applied*
2
●
Engine speed: Idle
*1: After the engine is warmed up to normal operating temperature, drive vehicle until “FLUID TEMP SE” (A/T
fluid temperature sensor signal) indicates more than 60
°
C (140
°
F).
*2: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight
ahead.
Inspection Procedure
UBS00K4I
NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale display.
1.
Perform
.
2.
Confirm that the testing conditions indicated above are met.
3.
Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”
and “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode with
CONSULT-II.
4.
Make sure that monitor items are within the SP value.
5.
If NG, go to
EC-149, "Diagnostic Procedure"
.
SEF601Z
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-149
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2005 Pathfinder
Diagnostic Procedure
UBS00K4J
OVERALL SEQUENCE
PBIB2268E
EC-150
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
2005 Pathfinder
PBIB2548E
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-151
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2005 Pathfinder
DETAILED PROCEDURE
1.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Confirm that the testing conditions are met. Refer to
.
3.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR
(SPEC)” mode, and make sure that the each indication is within
the SP value.
NOTE:
Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1
minute because they may fluctuate. It is NG if the indication is
out of the SP value even a little.
OK or NG
OK
>> GO TO 17.
NG (Less than the SP value)>>GO TO 2.
NG (More than the SP value)>>GO TO 3.
2.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.
OK or NG
OK
>> GO TO 4.
NG (More than the SP value)>>GO TO 19.
3.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.
OK or NG
OK
>> GO TO 6.
NG (More than the SP value)>>GO TO 6.
NG (Less than the SP value)>>GO TO 25.
4.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Stop the engine.
2.
Disconnect PCV hose, and then plug it.
3.
Start engine.
4.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 6.
PBIB2369E
PBIB2332E
PBIB2332E
EC-152
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
2005 Pathfinder
5.
CHANGE ENGINE OIL
1.
Stop the engine.
2.
Change engine oil.
NOTE:
This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detected after changing engine oil or changing driving con-
dition.
>> INSPECTION END
6.
CHECK FUEL PRESSURE
Check fuel pressure. (Refer to
.)
OK or NG
OK
>> GO TO 9.
NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to
. GO TO 8.
NG (Fuel pressure is too low)>>GO TO 7.
7.
DETECT MALFUNCTIONING PART
1.
Check the following.
–
Clogged and bent fuel hose and fuel tube
–
Clogged fuel filter
–
Fuel pump and its circuit (Refer to
.)
2.
If NG, repair or replace the malfunctioning part. (Refer to
.)
If OK, replace fuel pressure regulator.
>> GO TO 8.
8.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 9.
9.
PERFORM POWER BALANCE TEST
1.
Perform “POWER BALANCE” in “ACTIVE TEST” mode.
2.
Make sure that the each cylinder produces a momentary engine
speed drop.
OK or NG
OK
>> GO TO 12.
NG
>> GO TO 10.
PBIB0133E
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-153
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2005 Pathfinder
10.
DETECT MALFUNCTIONING PART
1.
Check the following.
–
Ignition coil and its circuit (Refer to
.)
–
Fuel injector and its circuit (Refer to
.)
–
Intake air leakage
–
Low compression pressure (Refer to
EM-91, "CHECKING COMPRESSION PRESSURE"
.)
2.
If NG, repair or replace the malfunctioning part.
If OK, replace fuel injector. (It may be caused by leakage from fuel injector or clogging.)
>> GO TO 11.
11.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 12.
12.
CHECK A/F SENSOR 1 FUNCTION
Perform all DTC Confirmation Procedure related with A/F sensor 1.
●
For DTC P1271, P1281, refer to
EC-483, "DTC Confirmation Procedure"
.
●
For DTC P1272, P1282, refer to
EC-492, "DTC Confirmation Procedure"
.
●
For DTC P1273, P1283, refer to
EC-501, "DTC Confirmation Procedure"
.
●
For DTC P1274, P1284, refer to
EC-511, "DTC Confirmation Procedure"
.
●
For DTC P1276, P1286, refer to
EC-521, "DTC Confirmation Procedure"
.
●
For DTC P1278, P1288, refer to
EC-532, "DTC Confirmation Procedure"
.
●
For DTC P1279, P1289, refer to
EC-544, "DTC Confirmation Procedure"
.
OK or NG
OK
>> GO TO 15.
NG
>> GO TO 13.
13.
CHECK A/F SENSOR 1 CIRCUIT
Perform Diagnostic Procedure according to corresponding DTC.
>> GO TO 14.
14.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 15.
EC-154
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
2005 Pathfinder
15.
DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
1.
Stop the engine.
2.
Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.
>> GO TO 16.
16.
CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1.
Start engine.
2.
Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG
>> Detect malfunctioning part according to
EC-102, "Symptom Matrix Chart"
.
17.
CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.
OK or NG
OK
>> INSPECTION END
NG (More than the SP value)>>GO TO 18.
NG (Less than the SP value)>>GO TO 25.
18.
DETECT MALFUNCTIONING PART
1.
Check for the cause of large engine friction. Refer to the following.
–
Engine oil level is too high
–
Engine oil viscosity
–
Belt tension of power steering, alternator, A/C compressor, etc. is excessive
–
Noise from engine
–
Noise from transmission, etc.
2.
Check for the cause of insufficient combustion. Refer to the following.
–
Valve clearance malfunction
–
Intake valve timing control function malfunction
–
Camshaft sprocket installation malfunction, etc.
>> Repair or replace malfunctioning part, and then GO TO 30.
19.
CHECK INTAKE SYSTEM
Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
●
Crushed air ducts
●
Malfunctioning seal of air cleaner element
●
Uneven dirt of air cleaner element
●
Improper specification of intake air system
OK or NG
OK
>> GO TO 21.
NG
>> Repair or replace malfunctioning part, and then GO TO 20.
PBIB2332E
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