Nissan Pathfinder (2012 year). Instruction — part 250
DIAGNOSIS SYSTEM (ECM)
EC-81
< SYSTEM DESCRIPTION >
[VQ40DE]
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MASS AIRFLOW
g/s
• Indicates the mass air flow computed by ECM ac-
cording 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 increas-
es.
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 con-
trol solenoid valve (determined by ECM according
to the input signals) is indicated.
• The advance angle becomes larger as the value in-
creases.
INT/V SOL(B2)
%
VIAS S/V-1
ON/OFF
• The control condition of the VIAS control solenoid
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 operating.
AIR COND RLY
ON/OFF
• The air conditioner relay control condition (deter-
mined by ECM according to the input signals) is in-
dicated.
FUEL PUMP RLY
ON/OFF
• Indicates the fuel pump relay control condition de-
termined by ECM according to the input signals.
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 control
condition determined by the ECM according 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 in-
dicated.
HI: High speed operation
LOW: Low speed operation
OFF: Stop
HO2S2 HTR (B1)
ON/OFF • Indicates [ON/OFF] condition of heated oxygen
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 thein-
put speed sensor signal.
VEHICLE SPEED
km/h or
mph
• Indicates the vehicle speed computed from the out-
put speed sensor signal.
IDL A/V LEARN
YET/
CMPLT
• Displays the condition of idle air volume learning
YET: Idle air volume learning has not been per-
formed yet.
CMPLT: Idle air volume learning has already been
performed successfully.
TRVL AFTER MIL
km or
mile
• Distance traveled while MIL is activated.
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)
%
Monitored item
Unit
Description
Remarks
August 2012
2012 Pathfinder
EC-82
< SYSTEM DESCRIPTION >
[VQ40DE]
DIAGNOSIS SYSTEM (ECM)
AC PRESS SEN
V
• The signal voltage from the refrigerant pressure
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/AC-
CELERATE 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 op-
eration 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 op-
eration 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 cancel
signal sent from the TCM.
CRUISE LAMP
ON/OFF
• Indicates [ON/OFF] condition of CRUISE lamp de-
termined by the ECM according to the input sig-
nals.
SET LAMP
ON/OFF
• Indicates [ON/OFF] condition of SET lamp deter-
mined by the ECM according to the input signals.
ALT DUTY
%
• Indicates the duty ratio of the power generation
command value. The ratio is calculated by ECM
based on the battery current sensor signal.
BAT CUR SEN
mV
• The signal voltage of battery current sensor is dis-
played.
ALT DUTY SIG
ON/OFF
• The control condition of the power generation volt-
age variable control (determined by ECM accord-
ing to the input signals) is indicated.
ON: Power generation voltage variable control is
active
OFF: Power generation voltage variable control is
inactive.
A/F ADJ-B1
—
• Indicates the correction factor saved in ECM. The
factor is calculated from the difference between the
target air-fuel ratio saved in ECM and the air-fuel
ratio calculated from A/F sensor 1 signal.
A/F ADJ-B2
—
Monitored item
Unit
Description
Remarks
August 2012
2012 Pathfinder
DIAGNOSIS SYSTEM (ECM)
EC-83
< SYSTEM DESCRIPTION >
[VQ40DE]
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*: The item is indicated, but not used.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
EVAP LEAK DIAG
YET/
CMPLT
• Indicates the condition of EVAP leak diagnosis.
YET: EVAP leak diagnosis has not been performed
yet.
CMPLT: EVAP leak diagnosis has been performed
successfully.
EVAP DIAG READY
ON/OFF
• Indicates the ready condition of EVAP leak diagno-
sis.
ON: Diagnosis has been ready condition.
OFF: Diagnosis has not been ready condition.
HO2 S2 DIAG1(B1)
INCMP/
CMPLT
• Indicates DTC P0139 self-diagnosis (delayed re-
sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
HO2 S2 DIAG1(B2)
INCMP/
CMPLT
• Indicates DTC P0159 self-diagnosis (delayed re-
sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
HO2 S2 DIAG2(B1)
INCMP/
CMPLT
• Indicates DTC P0139 self-diagnosis (slow re-
sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
HO2 S2 DIAG2(B2)
INCMP/
CMPLT
• Indicates DTC P0159 self-diagnosis (slow re-
sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.
THRTL STK CNT B1
*
—
—
Monitored item
Unit
Description
Remarks
TEST ITEM
CONDITION
JUDGEMENT
CHECK ITEM (REMEDY)
FUEL INJEC-
TION
• Engine: Return to the original
non-standard condition
• Change the amount of fuel injec-
tion using CONSULT.
If malfunctioning symptom disap-
pears, see CHECK ITEM.
• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1
IGNITION TIM-
ING
• Engine: Return to the original
non-standard condition
• Timing light: Set
• Retard the ignition timing using
CONSULT.
If malfunctioning symptom disap-
pears, 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.
Engine runs rough or stops.
• 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.
Cooling fan moves and stops.
• Harness and connectors
• Cooling fan motor
• IPDM E/R
ENG COOLANT
TEMP
• Engine: Return to the original
non-standard condition
• Change the engine coolant tem-
perature using CONSULT.
If malfunctioning symptom disap-
pears, see CHECK ITEM.
• Harness and connectors
• Engine coolant temperature sen-
sor
• Fuel injector
August 2012
2012 Pathfinder
EC-84
< SYSTEM DESCRIPTION >
[VQ40DE]
DIAGNOSIS SYSTEM (ECM)
*: Leaving cooling fan OFF with CONSULT while engine is running may cause the engine to overheat.
DTC & SRT CONFIRMATION MODE
SRT STATUS Mode
• For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT screen; for items whose SRT
codes are not set, “INCMP” is displayed.
• “SRT STATUS” provides the presence or absence of permanent DTCs stored in ECM memory.
PERMANENT DTC STATUS Mode
How to display permanent DTC status
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON.
5. Select “PERMANENT DTC STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT.
NOTE:
Permanent DTCs stored in ECM memory are displayed on the CONSULT screen to show if a driving pat-
tern required for erasing permanent DTCs is complete (CMPLT) or incomplete (INCMP).
CAUTION:
FUEL PUMP RE-
LAY
• Ignition switch: ON (Engine
stopped)
• Turn the fuel pump relay ON and
OFF using CONSULT and listen
to operating sound.
Fuel pump relay makes the operat-
ing sound.
• Harness and connectors
• Fuel pump relay
VIAS S/V-1
• Ignition switch: ON
• Turn solenoid valve ON and OFF
with CONSULT and listen for op-
erating sound.
Solenoid valve makes an operating
sound.
• Harness and connectors
• Solenoid valve
PURG VOL
CONT/V
• Engine: After warming up, run en-
gine at 1,500 rpm.
• Change the EVAP canister purge
volume control solenoid valve
opening percent using CON-
SULT.
Engine speed changes according to
the opening percent.
• Harness and connectors
• Solenoid valve
FUEL/T TEMP
SEN
• Change the fuel tank temperature using CONSULT.
VENT CON-
TROL/V
• Ignition switch: ON (Engine
stopped)
• Turn solenoid valve ON and OFF
with the CONSULT and listen to
operating sound.
Solenoid valve makes an operating
sound.
• Harness and connectors
• Solenoid valve
V/T ASSIGN AN-
GLE
• Engine: Return to the original
non-standard condition
• Change intake valve timing using
CONSULT.
If malfunctioning symptom disap-
pears, see CHECK ITEM.
• Harness and connectors
• Intake valve timing control sole-
noid valve
ALTERNATOR
DUTY
• Engine: Idle
• Change duty ratio using CON-
SULT.
Battery voltage changes.
• Harness and connectors
• IPDM E/R
• Alternator
TEST ITEM
CONDITION
JUDGEMENT
CHECK ITEM (REMEDY)
August 2012
2012 Pathfinder
DIAGNOSIS SYSTEM (ECM)
EC-85
< SYSTEM DESCRIPTION >
[VQ40DE]
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Since the “PERMANENT DTC STATUS” screen displays the previous trip information, repeat the
following twice to update the information: “Ignition switch OFF”, “Wait for more than 10 seconds”
and “Ignition switch ON”.
NOTE:
This mode is not used in regions that permanent DTCs are not regulated by law.
SRT WORK SUPPORT Mode
This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.
PERMANENT DTC WORK SUPPORT Mode
This mode enables a technician to drive a vehicle to complete the driving pattern that is reguired for erasing
permanent DTC.
NOTE:
This mode is not used in regions that permanent DTCs are not regulated by law.
DTC WORK SUPPORT Mode
*: DTC P1456 does not apply to R51 models but appears in DTC Work Support Mode screens.
JSBIA0062GB
Test mode
Test item
Corresponding DTC No.
Reference page
EVAPORATIVE SYS-
TEM
EVP V/S LEAK P0456/P1456*
P0442
P0455
P0456
PURG VOL CN/V P1444
P0443
PURG FLOW P0441
P0441
A/F SEN1
A/F SEN1(B1) P1278/P1279
P0133
A/F SEN1(B1) P1276
P0130
A/F SEN1(B2) P1288/P1289
P0153
A/F SEN1(B2) P1286
P0150
HO2S2
HO2S2 (B1) P1146
P0138
HO2S2(B1) P1147
P0137
HO2S2(B1) P0139
P0139
HO2S2(B2) P1166
P0158
HO2S2(B2) P1167
P0157
HO2S2(B2) P0159
P0159
August 2012
2012 Pathfinder
EC-86
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
DTC/CIRCUIT DIAGNOSIS
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Description
INFOID:0000000007357982
The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONI-
TOR” mode of CONSULT during normal operation of the Engine Control System. When the value in “SPEC” of
“DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the value
“SPEC” of “DATA MONITOR” 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 illuminate
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 correc-
tion)
• 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
INFOID:0000000007357983
• 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
INFOID:0000000007357984
NOTE:
Perform “SPEC” of “DATA MONITOR” 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 “SPEC” of “DATA
MONITOR” mode with CONSULT.
4. Make sure that monitor items are within the SP value.
5. If NG, go to
.
Diagnosis Procedure
INFOID:0000000007357985
OVERALL SEQUENCE
August 2012
2012 Pathfinder
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-87
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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JMBIA1468GB
August 2012
2012 Pathfinder
EC-88
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
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 “SPEC” of “DATA MONITOR” mode, and make sure that
each indication is within the SP value.
NOTE:
PBIB3214E
August 2012
2012 Pathfinder
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