Nissan Pathfinder (2006 year). Manual — part 157

TROUBLE DIAGNOSIS

EC-115

2006 Pathfinder

X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to

EC-116

*3: Always “CMPLT” is displayed.

INSPECTION PROCEDURE

Refer to

GI-38, "CONSULT-II Start Procedure"

WORK SUPPORT MODE
Work Item

ENGI

NE CONTROL CO

MPONENT P

ARTS

OUTPUT

Fuel injector

Power transistor (Ignition timing)

Throttle control motor relay

Throttle control motor

EVAP canister purge volume con-
trol solenoid valve

Air conditioner relay

Fuel pump relay

Cooling fan relay

Air fuel ratio (A/F) sensor 1 heater

Heated oxygen sensor 2 heater

EVAP canister vent control valve

Intake valve timing control solenoid
valve

VIAS control solenoid valve

Alternator

Calculated load value

Item

DIAGNOSTIC TEST MODE

WORK

SUP-

PORT

SELF-DIAGNOSTIC

RESULTS

DATA

MONI-

TOR

DATA

MONI-

TOR

(SPEC)

ACTIVE

TEST

DTC & SRT

CONFIRMATION

DTC*1

FREEZE

FRAME
DATA*2

SRT

STATUS

DTC

WORK

SUP-

PORT

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

●

FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.

When releasing fuel pressure
from fuel line

IDLE AIR VOL LEARN

●

THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.

When learning the idle air volume

SELF-LEARNING CONT

●

THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.

When clearing the coefficient of
self-learning control value

EC-116

TROUBLE DIAGNOSIS

2006 Pathfinder

*: This function is not necessary in the usual service procedure.

SELF-DIAG RESULTS MODE
Self Diagnostic Item

Regarding items of DTC and 1st trip DTC, refer to

EC-48, "EMISSION-RELATED DIAGNOSTIC INFORMA-

TION ITEMS"

Freeze Frame Data and 1st Trip Freeze Frame Data

EVAP SYSTEM CLOSE

CLOSE THE EVAP CANISTER VENT CONTROL VALVE IN
ORDER TO MAKE EVAP SYSTEM CLOSE UNDER THE
FOLLOWING CONDITIONS.

●

IGN SW ON

●

ENGINE NOT RUNNING

●

AMBIENT TEMPERATURE IS ABOVE 0

C (32

F).

●

NO VACUUM AND NO HIGH PRESSURE IN EVAP SYS-
TEM

●

FUEL TANK TEMP. IS MORE THAN 0

C (32

F).

●

WITHIN 10 MINUTES AFTER STARTING “EVAP SYS-
TEM CLOSE”

●

WHEN TRYING TO EXECUTE “EVAP SYSTEM CLOSE”
UNDER THE CONDITION EXCEPT ABOVE, CONSULT-
II WILL DISCONTINUE IT AND DISPLAY APPROPRI-
ATE INSTRUCTION.

NOTE:
WHEN STARTING ENGINE, CONSULT-II MAY DISPLAY
“BATTERY VOLTAGE IS LOW. CHARGE BATTERY”,
EVEN IN USING CHARGED BATTERY.

When detecting EVAP vapor leak
point of EVAP system

VIN REGISTRATION

●

IN THE MODE, VIN IS REGISTERED IN ECM.

When registering VIN in ECM

TARGET IDLE RPM ADJ*

●

IDLE CONDITION

When setting target idle speed

TARGET IGN TIM ADJ*

●

IDLE CONDITION

When adjusting target ignition tim-
ing

WORK ITEM

CONDITION

USAGE

Freeze frame data

item*

Description

DIAG TROUBLE
CODE
[PXXXX]

●

The engine control component part/control system has a trouble code, it is displayed as PXXXX. (Refer to

EC-8, "INDEX FOR DTC"

FUEL SYS-B1

●

“Fuel injection system status” at the moment a malfunction is detected is displayed.

●

One mode in the following is displayed.
Mode2: Open loop due to detected system malfunction
Mode3: Open loop due to driving conditions (power enrichment, deceleration enleanment)
Mode4: Closed loop - using oxygen sensor(s) as feedback for fuel control
Mode5: Open loop - has not yet satisfied condition to go to closed loop

FUEL SYS-B2

CAL/LD VALUE [%]

●

The calculated load value at the moment a malfunction is detected is displayed.

COOLANT TEMP [

or [

●

The engine coolant temperature at the moment a malfunction is detected is displayed.

L-FUEL TRM-B1 [%]

●

“Long-term fuel trim” at the moment a malfunction is detected is displayed.

●

The long-term fuel trim indicates much more gradual feedback compensation to the base fuel schedule
than short-term fuel trim.

L-FUEL TRM-B2 [%]

S-FUEL TRM-B1 [%]

●

“Short-term fuel trim” at the moment a malfunction is detected is displayed.

●

The short-term fuel trim indicates dynamic or instantaneous feedback compensation to the base fuel
schedule.

S-FUEL TRM-B2 [%]

ENGINE SPEED
[rpm]

●

The engine speed at the moment a malfunction is detected is displayed.

VEHICL SPEED [km/
h] or [mph]

●

The vehicle speed at the moment a malfunction is detected is displayed.

TROUBLE DIAGNOSIS

EC-117

2006 Pathfinder

*: The items are the same as those of 1st trip freeze frame data.

DATA MONITOR MODE
Monitored Item

: Applicable

B/FUEL SCHDL
[msec]

●

The base fuel schedule at the moment a malfunction is detected is displayed.

INT/A TEMP SE [

or [

●

The intake air temperature at the moment a malfunction is detected is displayed.

Freeze frame data

item*

Description

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

●

Indicates the engine speed computed from the
signal of the crankshaft position sensor (POS)
and camshaft position sensor (PHASE).

●

Accuracy becomes poor if engine
speed drops below the idle rpm.

●

If the signal is interrupted while the
engine is running, an abnormal value
may be indicated.

MAS A/F SE-B1 [V]

●

The signal voltage of the mass air flow sensor
is displayed.

●

When the engine is stopped, a cer-
tain value is indicated.

B/FUEL SCHDL
[msec]

●

“Base fuel schedule” indicates the fuel injec-
tion pulse width programmed into ECM, prior
to any learned on board correction.

A/F ALPHA-B1 [%]

●

The mean value of the air-fuel ratio feedback
correction factor per cycle is indicated.

●

When the engine is stopped, a cer-
tain value is indicated.

●

This data also includes the data for
the air-fuel ratio learning control.

A/F ALPHA-B2 [%]

COOLAN TEMP/S
[

C] or [

●

The engine coolant temperature (determined
by the signal voltage of the engine coolant
temperature sensor) is displayed.

●

When the engine coolant tempera-
ture sensor is open or short-circuited,
ECM enters fail-safe mode. The
engine coolant temperature deter-
mined by the ECM is displayed.

A/F SEN1 (B1) [V]

●

The A/F signal computed from the input signal
of the Air fuel ratio (A/F) sensor 1 is displayed.

A/F SEN1 (B2) [V]

HO2S2 (B1) [V]

●

The signal voltage of the heated oxygen sen-
sor 2 is displayed.

HO2S2 (B2) [V]

HO2S2 MNTR (B1)
[RICH/LEAN]

●

Display of heated oxygen sensor 2 signal:
RICH: Means the amount of oxygen after
three way catalyst is relatively small.
LEAN: Means the amount of oxygen after
three way catalyst is relatively large.

●

When the engine is stopped, a cer-
tain value is indicated.

HO2S2 MNTR (B2)
[RICH/LEAN]

VHCL SPEED SE
[km/h] or [mph]

●

The vehicle speed computed from the vehicle
speed signal sent from combination meter is
displayed.

BATTERY VOLT [V]

●

The power supply voltage of ECM is dis-
played.

ACCEL SEN 1 [V]

●

The accelerator pedal position sensor signal
voltage is displayed.

●

ACCEL SEN 2 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal.

ACCEL SEN 2 [V]

THRTL SEN 1 [V]

●

The throttle position sensor signal voltage is
displayed.

●

THRTL SEN 2 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal.

THRTL SEN 2 [V]

FUEL T/TMP SE
[

C] or [

●

The fuel temperature (determined by the sig-
nal voltage of the fuel tank temperature sen-
sor) is displayed.

EC-118

TROUBLE DIAGNOSIS

2006 Pathfinder

INT/A TEMP SE
[

C] or [

●

The intake air temperature (determined by the
signal voltage of the intake air temperature
sensor) is indicated.

EVAP SYS PRES
[V]

●

The signal voltage of EVAP control system
pressure sensor is displayed.

FUEL LEVEL SE
[V]

●

The signal voltage of the fuel level sensor is
displayed.

START SIGNAL
[ON/OFF]

●

Indicates start signal status [ON/OFF] com-
puted by the ECM according to the signals of
engine speed and battery voltage.

●

After starting the engine, [OFF] is
displayed regardless of the starter
signal.

CLSD THL POS
[ON/OFF]

●

Indicates idle position [ON/OFF] computed by
ECM according to the accelerator pedal posi-
tion sensor signal.

AIR COND SIG
[ON/OFF]

●

Indicates [ON/OFF] condition of the air condi-
tioner switch as determined by the air condi-
tioner signal.

P/N POSI SW
[ON/OFF]

●

Indicates [ON/OFF] condition from the park/
neutral position (PNP) switch signal.

PW/ST SIGNAL
[ON/OFF]

●

[ON/OFF] condition of the power steering sys-
tem (determined by the signal voltage of the
power steering pressure sensor signal) is indi-
cated.

LOAD SIGNAL
[ON/OFF]

●

Indicates [ON/OFF] condition from the electri-
cal load signal.
ON: Rear window defogger switch is ON and/
or lighting switch is in 2nd position.
OFF: Both rear window defogger switch and
lighting switch are OFF.

IGNITION SW
[ON/OFF]

●

Indicates [ON/OFF] condition from ignition
switch signal.

HEATER FAN SW
[ON/OFF]

●

Indicates [ON/OFF] condition from the heater
fan switch signal.

BRAKE SW
[ON/OFF]

●

Indicates [ON/OFF] condition from the stop
lamp switch signal.

INJ PULSE-B1
[msec]

●

Indicates the actual fuel injection pulse width
compensated by ECM according to the input
signals.

●

When the engine is stopped, a cer-
tain computed value is indicated.

INJ PULSE-B2
[msec]

IGN TIMING
[BTDC]

●

Indicates the ignition timing computed by ECM
according to the input signals.

●

When the engine is stopped, a cer-
tain value is indicated.

CAL/LD VALUE [%]

●

Calculated load value indicates the value of
the current air flow divided by peak air flow.

MASS AIRFLOW
[g·m/s]

●

Indicates the mass air flow computed by ECM
according to the signal voltage of the mass air
flow sensor.

PURG VOL C/V [%]

●

Indicates the EVAP canister purge volume
control solenoid valve control value computed
by the ECM according to the input signals.

●

The opening becomes larger as the value
increases.

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

TROUBLE DIAGNOSIS

EC-119

2006 Pathfinder

INT/V TIM (B1)
[

CA]

●

Indicates [

CA] of intake camshaft advanced

angle.

INT/V TIM (B2)
[

CA]

INT/V SOL (B1) [%]

●

The control condition of the intake valve timing
control solenoid valve (determined by ECM
according to the input signals) is indicated.

●

The advance angle becomes larger as the
value increases.

INT/V SOL (B2) [%]

VIAS/SV
[ON/OFF]

●

The control condition of the VIAS control sole-
noid valve (determined by ECM according to
the input signals) is indicated.
ON: VIAS control solenoid valve is operating.
OFF: VIAS control solenoid valve is not oper-
ating.

AIR COND RLY
[ON/OFF]

●

The air conditioner relay control condition
(determined by ECM according to the input
signals) is indicated.

FUEL PUMP RLY
[ON/OFF]

●

Indicates the fuel pump relay control condition
determined by ECM according to the input sig-
nals.

VENT CONT/V
[ON/OFF]

●

The control condition of the EVAP canister
vent control valve (determined by ECM
according to the input signals) is indicated.
ON: Closed
OFF: Open

THRTL RELAY
[ON/OFF]

●

Indicates the throttle control motor relay con-
trol condition determined by the ECM accord-
ing to the input signals.

COOLING FAN
[HI/LOW/OFF]

●

The control condition of the cooling fan (deter-
mined by ECM according to the input signals)
is indicated.
HI: High speed operation
LOW: Low speed operation
OFF: Stop

HO2S2 HTR (B1)
[ON/OFF]

●

Indicates [ON/OFF] condition of heated oxy-
gen sensor 2 heater determined by ECM
according to the input signals.

HO2S2 HTR (B2)
[ON/OFF]

I/P PULLY SPD
[rpm]

●

Indicates the engine speed computed from the
turbine revolution sensor signal.

VEHICLE SPEED
[km/h] or [MPH]

●

Indicates the vehicle speed computed from the
revolution sensor signal.

IDL A/V LEARN
[YET/CMPLT]

●

Display the condition of idle air volume learn-
ing
YET: Idle air volume learning has not been
performed yet.
CMPLT: Idle air volume learning has already
been performed successfully.

TRVL AFTER MIL
[km] or [mile]

●

Distance traveled while MIL is activated.

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

EC-120

TROUBLE DIAGNOSIS

2006 Pathfinder

A/F S1 HTR (B1)
[%]

●

Air fuel ratio (A/F) sensor 1 heater control
value computed by ECM according to the
input signals.

●

The current flow to the heater becomes larger
as the value increases.

A/F S1 HTR (B2)
[%]

AC PRESS SEN
[V]

●

The signal voltage from the refrigerant pres-
sure sensor is displayed.

VHCL SPEED SE
[km/h] or [mph]

●

The vehicle speed computed from the vehicle
speed signal sent from TCM is displayed.

SET VHCL SPD
[km/h] or [mph]

●

The preset vehicle speed is displayed.

MAIN SW
[ON/OFF]

●

Indicates [ON/OFF] condition from MAIN
switch signal.

CANCEL SW
[ON/OFF]

●

Indicates [ON/OFF] condition from CANCEL
switch signal.

RESUME/ACC SW
[ON/OFF]

●

Indicates [ON/OFF] condition from RESUME/
ACCELERATE switch signal.

SET SW
[ON/OFF]

●

Indicates [ON/OFF] condition from SET/
COAST switch signal.

BRAKE SW1
[ON/OFF]

●

Indicates [ON/OFF] condition from ASCD
brake switch signal.

BRAKE SW2
[ON/OFF]

●

Indicates [ON/OFF] condition of stop lamp
switch signal.

VHCL SPD CUT
[NON/CUT]

●

Indicates the vehicle cruise condition.
NON: Vehicle speed is maintained at the
ASCD set speed.
CUT: Vehicle speed increased to excessively
high compared with the ASCD set speed, and
ASCD operation is cut off.

LO SPEED CUT
[NON/CUT]

●

Indicates the vehicle cruise condition.
NON: Vehicle speed is maintained at the
ASCD set speed.
CUT: Vehicle speed decreased to excessively
low compared with the ASCD set speed, and
ASCD operation is cut off.

AT OD MONITOR
[ON/OFF]

●

Indicates [ON/OFF] condition of A/T O/D
according to the input signal from the TCM.

AT OD CANCEL
[ON/OFF]

●

Indicates [ON/OFF] condition of A/T O/D can-
cel signal sent from the TCM.

CRUISE LAMP
[ON/OFF]

●

Indicates [ON/OFF] condition of CRUISE lamp
determined by the ECM according to the input
signals.

SET LAMP
[ON/OFF]

●

Indicates [ON/OFF] condition of SET lamp
determined by the ECM according to the input
signals.

ALT DUTY [%]

●

Indicates the duty ratio of the power genera-
tion command value. The ratio is calculated by
ECM based on the battery current sensor sig-
nal.

BAT CUR SEN
[mV]

●

The signal voltage of battery current sensor is
displayed.

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

TROUBLE DIAGNOSIS

EC-121

2006 Pathfinder

NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

DATA MONITOR (SPEC) MODE
Monitored Item

NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

ALT DUTY SIG
[ON/OFF]

●

The control condition of the power generation
voltage variable control (determined by ECM
according to the input signals) is indicated.
ON: Power generation voltage variable control
is active
OFF: Power generation voltage variable con-
trol is inactive.

A/F ADJ-B1

●

Indicates the correction factor stored in ECM.
The factor is calculated from the difference
between the target air-fuel ratio stored in ECM
and the air-fuel ratio calculated from A/F sen-
sor 1 signal.

A/F ADJ-B2

Voltage [V]

●

Voltage, frequency, duty cycle or pulse width
measured by the probe.

●

Only # is displayed if item is unable
to be measured.

●

Figures with #s are temporary ones.
They are the same figures as an
actual piece of data which was just
previously measured.

Frequency [msec],
[Hz] or [%]

DUTY-HI

DUTY-LOW

PLS WIDTH-HI

PLS WIDTH-LOW

Monitored item

[Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

Monitored item [Unit]

ECM

INPUT

SIG-

NALS

MAIN

SIG-

NALS

Description

Remarks

ENG SPEED [rpm]

●

Indicates the engine speed computed
from the signal of the crankshaft position
sensor (POS) and camshaft position
sensor (PHASE).

MAS A/F SE-B1 [V]

●

The signal voltage of the mass air flow
sensor specification is displayed.

●

When engine is running specification
range is indicated.

B/FUEL SCHDL
[msec]

●

“Base fuel schedule” indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board cor-
rection.

●

When engine is running specification
range is indicated.

A/F ALPHA-B1 [%]
A/F ALPHA-B2 [%]

●

The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.

●

When engine is running specification
range is indicated.

●

This data also includes the data for the
air-fuel ratio learning control.

EC-122

TROUBLE DIAGNOSIS

2006 Pathfinder

ACTIVE TEST MODE
Test Item

*: Leaving cooling fan OFF with CONSULT-II while engine is running may cause the engine to overheat.

TEST ITEM

CONDITION

JUDGEMENT

CHECK ITEM (REMEDY)

FUEL INJEC-
TION

●

Engine: Return to the original
trouble condition

●

Change the amount of fuel injec-
tion using CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connectors

●

Fuel injector

●

Air fuel ratio (A/F) sensor 1

IGNITION TIM-
ING

●

Engine: Return to the original
trouble condition

●

Timing light: Set

●

Retard the ignition timing using
CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Perform Idle Air Volume Learning.

POWER BAL-
ANCE

●

Engine: After warming up, idle
the engine.

●

A/C switch: OFF

●

Shift lever: P or N

●

Cut off each fuel injector signal
one at a time using CONSULT-II.

Engine runs rough or dies.

●

Harness and connectors

●

Compression

●

Fuel injector

●

Power transistor

●

Spark plug

●

Ignition coil

COOLING FAN*

●

Ignition switch: ON

●

Turn the cooling fan HI, LOW and
OFF using CONSULT-II.

Cooling fan moves and stops.

●

Harness and connectors

●

Cooling fan motor

●

IPDM E/R

ENG COOLANT
TEMP

●

Engine: Return to the original
trouble condition

●

Change the engine coolant tem-
perature using CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connectors

●

Engine coolant temperature sen-
sor

●

Fuel injector

FUEL PUMP
RELAY

●

Ignition switch: ON (Engine
stopped)

●

Turn the fuel pump relay ON and
OFF using CONSULT-II and lis-
ten to operating sound.

Fuel pump relay makes the operat-
ing sound.

●

Harness and connectors

●

Fuel pump relay

VIAS SOL VALVE

●

Ignition switch: ON

●

Turn solenoid valve ON and OFF
with CONSULT-II and listen for
operating sound.

Solenoid valve makes an operating
sound.

●

Harness and connectors

●

Solenoid valve

PURG VOL
CONT/V

●

Engine: After warming up, run
engine at 1,500 rpm.

●

Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT-II.

Engine speed changes according to
the opening percent.

●

Harness and connectors

●

Solenoid valve

FUEL/T TEMP
SEN

●

Change the fuel tank temperature using CONSULT-II.

VENT CON-
TROL/V

●

Ignition switch: ON (Engine
stopped)

●

Turn solenoid valve ON and OFF
with the CONSULT-II and listen
to operating sound.

Solenoid valve makes an operating
sound.

●

Harness and connectors

●

Solenoid valve

V/T ASSIGN
ANGLE

●

Engine: Return to the original
trouble condition

●

Change intake valve timing using
CONSULT-II.

If trouble symptom disappears, see
CHECK ITEM.

●

Harness and connectors

●

Intake valve timing control sole-
noid valve

ALTERNATOR
DUTY

●

Engine: Idle

●

Change duty ratio using CON-
SULT-II.

Battery voltage changes.

●

Harness and connectors

●

IPDM E/R

●

Alternator

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Nissan Pathfinder (2006 year). Manual — part 157

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