Nissan Pathfinder (2006 year). Manual - part 159

 

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Nissan Pathfinder (2006 year). Manual - part 159

 

 

TROUBLE DIAGNOSIS

EC-131

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2006 Pathfinder

*1: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ
from ECM terminals voltage signal.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

SC-5, "SPECIFIC GRAVITY CHECK"

 .

BAT CUR SEN

●

Engine speed: Idle

●

Battery: Fully charged*

2

●

Shift lever: P or N

●

Air conditioner switch: OFF

●

No load

Approx. 2,600 - 3,500mV

ALT DUTY SIG

●

Power generation voltage variable control: Operating

ON

●

Power generation voltage variable control: Not operating

OFF

MONITOR ITEM

CONDITION

SPECIFICATION

EC-132

TROUBLE DIAGNOSIS

2006 Pathfinder

Major Sensor Reference Graph in Data Monitor Mode

UBS00K4F

The following are the major sensor reference graphs in “DATA MONITOR” mode.

CLSD THL POS, ACCEL SEN 1, THRTL SEN 1

Below is the data for “CLSD THL POS”, “ACCEL SEN 1” and “THRTL SEN 1” when depressing the accelera-
tor pedal with the ignition switch ON and with selector lever in D position.
The signal of “ACCEL SEN 1” and “THRTL SEN 1” should rise gradually without any intermittent drop or rise
after “CLSD THL POS” is changed from ON to OFF.

ENG SPEED, MAS A/F SE-B1, THRTL SEN 1, HO2S2 (B1), INJ PULSE-B1

Below is the data for “ENG SPEED”, “MAS A/F SE-B1”, “THRTL SEN 1”, “HO2S2 (B1)” and “INJ PULSE-B1”
when revving engine quickly up to 4,800 rpm under no load after warming up engine sufficiently.
Each value is for reference, the exact value may vary.

PBIB0198E

PBIB2445E

TROUBLE DIAGNOSIS

EC-133

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2006 Pathfinder

PBIB2099E

EC-134

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

2006 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 (3,107 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 

EC-70, "Basic Inspection"

 .

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-135, "Diagnostic Procedure"

 .

SEF601Z

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-135

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2006 Pathfinder

Diagnostic Procedure

UBS00K4J

OVERALL SEQUENCE

PBIB2268E

EC-136

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

2006 Pathfinder

PBIB3214E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-137

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2006 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 

EC-134, "Testing Condition"

 .

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-138

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

2006 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 

EC-79, "Fuel Pressure Check"

 .)

OK or NG

OK

>> GO TO 9.

NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to 

EC-79

 . 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 

EC-640

 .)

2.

If NG, repair or replace the malfunctioning part. (Refer to 

EC-79

 .)

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

 

 

 

 

 

 

 

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