Nissan Pathfinder. Manual — part 441
EC-70
< SYSTEM DESCRIPTION >
[VQ35DE]
DIAGNOSIS SYSTEM (ECM)
*: This function is not necessary in the usual service procedure.
ACTIVE TEST MODE
Test Item
WORK ITEM
CONDITION
USAGE
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
EVAP SYSTEM CLOSE
Close the EVAP canister vent control valve in order to
make EVAP system close under the following conditions.
• Ignition switch ON
• Engine not running
• Ambient temperature is above 0
°C (32°F).
• No vacuum and no high pressure in EVAP system
• Fuel tank temperature is more than 0
°C (32°F).
• Within 10 minutes after starting “EVAP SYSTEM
CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” un-
der the condition except above, CONSULT will discon-
tinue it and display appropriate instruction.
NOTE:
When starting engine, CONSULT may display
“BATTERY VOLTAGE IS LOW. CHARGE BAT-
TERY”, even in using charged battery.
When detecting EVAP vapor leakage in the
EVAP system
FUEL PRESSURE RE-
LEASE
Fuel pump will stop by touching “START” during idling.
crank a few times after engine stalls.
When releasing fuel pressure from fuel line
SELF-LEARNING CONT
The coefficient of self-learning control mixture ratio re-
turns to the original coefficient.
When clearing mixture ratio self-learning value
TARGET IGN TIM ADJ*
Idle condition
When adjusting target ignition timing
TARGET IDLE RPM ADJ* Idle condition
When setting target idle speed
VIN REGISTRATION
In this mode, VIN is registered in ECM
When registering VIN in ECM
CLSD THL POS LEARN
Ignition on and engine stopped.
When learning the throttle valve closed position
SAVING DATA FOR RE-
PLC CPU
In this mode, save data that is in ECM.
When ECM is replaced.
WRITING DATA FOR RE-
PLC CPU
In this mode, write data stored by “SAVE DATA FOR
CPU REPLC” in work support mode to ECM.
When ECM is replaced.
TEST ITEM
CONDITION
JUDGMENT
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
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
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.
DIAGNOSIS SYSTEM (ECM)
EC-71
< SYSTEM DESCRIPTION >
[VQ35DE]
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*: Leaving cooling fan OFF with CONSULT while engine is running may cause the engine to overheat.
DTC WORK SUPPORT MODE
Test item
FAN DUTY CON-
TROL
*
• Ignition switch: ON
• Change duty ratio using CON-
SULT.
Cooling fan speed changes.
• Harness and connectors
• Cooling fan motor
• Cooling fan relay
• Cooling fan control module
• IPDM E/R
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” using CONSULT and listen
to operating sound.
Solenoid valve makes the operating
sound.
• Harness and connectors
• Solenoid valve
ENGINE
MOUNTING
• Ignition switch: ON
• Turn electronic controlled engine
mount “IDLE” and “TRVL” with
CONSULT.
Electronic controlled engine mount
makes the operating sound.
• Harness and connectors
• Electronic controlled engine mount
VIAS S/V-2
• Ignition switch: ON
• Turn solenoid valve “ON” and
“OFF” using CONSULT and listen
to operating sound.
Solenoid valve makes the operating
sound.
• Harness and connectors
• Solenoid valve
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
• Selector lever: P or N position
• Cut off each 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
VENT CON-
TROL/V
• Ignition switch: ON (Engine
stopped)
• Turn solenoid valve “ON” and
“OFF” with the CONSULT and lis-
ten 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
TEST ITEM
CONDITION
JUDGMENT
CHECK ITEM (REMEDY)
Test mode
Test item
Corresponding DTC No.
Reference page
A/F SEN1
A/F SEN1(B1) P1276
P0130
A/F SEN1(B2) P1286
P0150
EVAPORATIVE SYSTEM
PURG FLOW P0441
P0441
PURG VOL CN/V P1444
P0443
EC-72
< SYSTEM DESCRIPTION >
[VQ35DE]
DIAGNOSIS SYSTEM (ECM)
SRT & P-DTC 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:
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 required for erasing
permanent DTC.
NOTE:
This mode is not used in regions that permanent DTCs are not regulated by law.
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
Test mode
Test item
Corresponding DTC No.
Reference page
JSBIA0062GB
ECM
EC-73
< ECU DIAGNOSIS INFORMATION >
[VQ35DE]
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ECU DIAGNOSIS INFORMATION
ECM
Reference Value
INFOID:0000000009178064
VALUES ON THE DIAGNOSIS TOOL
NOTE:
• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-
ble to this vehicle, refer to CONSULT display items.
• Numerical values in the following table are reference values.
• These values are input/output values that ECM receives/transmits and may differ from actual operations.
Example:
The ignition timing shown by the timing light may differ from the ignition timing displayed on the data monitor.
This occurs because the timing light shows a value calculated by ECM according to signals received from
the cam shaft position sensor and other sensors related to ignition timing.
For outlines of following items, refer to
Monitor Item
Condition
Values/Status
ENG SPEED
Run engine and compare CONSULT value with the tachometer indication.
Almost the same speed as
the tachometer indication.
MAS A/F SE-B1
See
.
B/FUEL SCHDL
See
.
A/F ALPHA-B1
See
.
A/F ALPHA-B2
See
.
COOLANT TEMP/S
Engine: After warming up
More than 70
°C (158°F)
A/F SEN1 (B1)
Engine: After warming up
Maintaining engine speed at 2,000 rpm
Fluctuates around 2.2 V
HO2S2 (B1)
Revving engine from idle to 3,000 rpm quickly after the following conditions are
met.
• Engine: After warming up
• After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
0 - 0.3 V
←→ Approx. 0.6 -
1.0 V
HO2S2 (B2)
Revving engine from idle to 3,000 rpm quickly after the following conditions are
met.
• Engine: After warming up
• After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
0 - 0.3 V
←→ Approx. 0.6 -
1.0 V
HO2S2 MNTR(B1)
Revving engine from idle to 3,000 rpm quickly after the following conditions are
met.
• Engine: After warming up
• After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
LEAN
←→ RICH
HO2S2 MNTR(B2)
Revving engine from idle to 3,000 rpm quickly after the following conditions are
met.
• Engine: After warming up
• After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
LEAN
←→ RICH
VHCL SPEED SE
Turn drive wheels and compare CONSULT value with the speedometer indica-
tion.
Almost the same speed as
speedometer indication
BATTERY VOLT
Ignition switch: ON (Engine stopped)
11 - 14 V
ACCEL SEN 1
Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
0.5 - 1.0 V
Accelerator pedal: Fully depressed
4.2 - 4.8 V
ACCEL SEN 2*
1
Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
0.5 - 1.0 V
Accelerator pedal: Fully depressed
4.2 - 4.8 V
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