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Nissan Quest E52. Manual - part 466

EC-74

< SYSTEM DESCRIPTION >

[VQ35DE]

DIAGNOSIS SYSTEM (ECM)

BRAKE SW1

ON/OFF

• Indicates [ON/OFF] condition from ASCD brake

switch signal or ASCD clutch switch.

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 decreased to excessively
low 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, and ASCD operation is cut off.

AT OD MONITOR

ON/OFF

• Indicates [ON/OFF] condition of CVT O/D ac-

cording to the input signal from the TCM.

AT OD CANCEL

ON/OFF

• Indicates [ON/OFF] condition of CVT O/D cancel

request signal.

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 deter-

mined by the ECM according to the input signals.

BAT CUR SEN

• The signal voltage of battery current sensor is

displayed.

ALT DUTY SIG

ON/OFF

• The control condition of the power generation

voltage variable control (determined by ECM ac-
cording 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 of a factor stored in ECM.

The factor is calculated from the difference be-
tween the target air-fuel ratio stored in ECM and
the air-fuel ratio calculated from A/F sensor 1 sig-
nal.

A/F ADJ-B2

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.

EVAP LEAK DIAG

YET/CMPLT

• Indicates the condition of EVAP leak diagnosis.
- YET: EVAP leak diagnosis has not been per-

formed yet.

- CMPLT: EVAP leak diagnosis has been per-

formed successfully.

EVAP DIAG READY

ON/OFF

• Indicates the ready condition of EVAP leak diag-

nosis.

- ON: Diagnosis has been ready condition.
- OFF: Diagnosis has not been ready condition.

HO2 S2 DIAG1 (B1)

INCMP/CM-

PLT

• Indicates DTC P0139 self-diagnosis (delayed re-

sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

HO2 S2 DIAG1 (B2)

INCMP/CM-

PLT

• Indicates DTC P0139 self-diagnosis (delayed re-

sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

Monitored item

Unit

Description

Remarks

DIAGNOSIS SYSTEM (ECM)

EC-75

< SYSTEM DESCRIPTION >

[VQ35DE]

*: 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.

WORK SUPPORT MODE

Work Item

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

ACTIVE TEST MODE

Test Item

HO2 S2 DIAG2 (B1)

INCMP/CM-

PLT

• Indicates DTC P0139 self-diagnosis (slow re-

sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

HO2 S2 DIAG2 (B2)

INCMP/CM-

PLT

• Indicates DTC P0139 self-diagnosis (slow re-

sponce) condition.
INCMP: Self-diagnosis is incomplete.
CMPLT: Self-diagnosis is complete.

THRTL STK CNT B1*

—

FUEL PUMP DUTY

• The control condition of the fuel pump control

module (FPCM) (determined by ECM according-
to the input signals) is indicated.

BAT TEMP SEN

• The signal voltage from the battery temperature

sensor is displayed.

Monitored item

Unit

Description

Remarks

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

• Fuel pump will stop by touching “START” during 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 spec-

ified 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 coefficient.

When clearing mixture ratio self-
learning value

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” under

the condition except above, CONSULT will discontinue it
and display appropriate instruction.
NOTE:
When starting engine, CONSULT may display “BAT-
TERY VOLTAGE IS LOW. CHARGE BATTERY”, even in
using charged battery.

When detecting EVAP vapor leak-
age in the EVAP system

VIN REGISTRATION

• In this 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

CLSD THL POS LEARN

• Ignition on and engine stopped.

When learning the throttle valve
closed position

SAVING DATA FOR REPLC CPU

In this mode, save data that is in ECM.

When ECM is replaced.

WRITING DATA FOR REPLC CPU

In this mode, write data stored by “SAVE DATA FOR CPU
REPLC” in work support mode to ECM.

When ECM is replaced.

EC-76

< SYSTEM DESCRIPTION >

[VQ35DE]

DIAGNOSIS SYSTEM (ECM)

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

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

COOLING FAN*

• Ignition switch: ON
• Turn the cooling fan “HI”, “MID”,

“LOW” and “OFF” using CON-
SULT.

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

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

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

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

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 lis-
ten to operating sound.

Solenoid valve makes an operating
sound.

• Harness and connectors
• Solenoid valve

DIAGNOSIS SYSTEM (ECM)

EC-77

< SYSTEM DESCRIPTION >

[VQ35DE]

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

DTC WORK SUPPORT MODE

Test Item

*: DTC P1442 and P1456 does not apply to this model but appears in DTC Work Support Mode screens.

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

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

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:

INT V/T ASSIGN
ANGLE

• 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.