Infiniti QX56 (JA60). Manual — part 354

EC-68

< FUNCTION DIAGNOSIS >

[VK56DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

TP SEN 1-B1 [V]

×

×

• The throttle position sensor signal volt-

age is displayed.

• TP SEN 2-B1 signal is converted by

ECM internally. Thus, it differs from
ECM terminal voltage signal.

TP SEN 2-B1 [V]

×

×

FUEL T/TMP SE
[

°C] or [°F]

• The fuel temperature (determined by the

signal voltage of the fuel tank tempera-
ture sensor) is displayed.

INT/A TEMP SE
[

°C] or [°F]

×

×

• 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 sys-

tem pressure sensor is displayed.

FUEL LEVEL SE [V]

×

• The signal voltage of the fuel level sen-

sor is displayed.

START SIGNAL
[ON/OFF]

• Indicates start signal status [ON/OFF]

computed by the ECM according to the
signals of engine speed and battery volt-
age.

• After starting the engine, [OFF] is dis-

played regardless of the starter signal.

CLSD THL POS
[ON/OFF]

×

×

• Indicates idle position [ON/OFF] comput-

ed by ECM according to the accelerator
pedal position sensor signal.

AIR COND SIG
[ON/OFF]

×

×

• Indicates [ON/OFF] condition of the air

conditioner switch as determined by the
air conditioner signal.

P/N POSI SW
[ON/OFF]

×

×

• Indicates [ON/OFF] condition from the

park/neutral position (PNP) signal.

PW/ST SIGNAL
[ON/OFF]

×

×

• [ON/OFF] condition of the power steering

system (determined by the signal voltage
of the power steering pressure sensor
signal) is indicated.

LOAD SIGNAL [ON/
OFF]

×

×

• Indicates [ON/OFF] condition from the

electrical 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 igni-

tion switch signal.

HEATER FAN SW
[ON/OFF]

×

• Indicates [ON/OFF] condition from heat-

er 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 certain

computed value is indicated.

INJ PULSE-B2
[msec]

IGN TIMING [BT-
DC]

• Indicates the ignition timing computed by

ECM according to the input signals.

• When the engine is stopped, a certain

value is indicated.

CAL/LD VALUE [%]

• “Calculated load value” indicates the val-

ue 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.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-69

< FUNCTION DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

PURG VOL C/V [%]

• Indicates the EVAP canister purge vol-

ume control solenoid valve control value
computed by the ECM according to the
input signals.

• The opening becomes larger as the val-

ue increases.

INT/V TIM (B1)
[

°CA]

• Indicates [

°CA] of intake camshaft ad-

vanced angle.

INT/V TIM (B2)
[

°CA]

INT/V SOL (B1) [%]

• The control value of the intake valve tim-

ing control solenoid valve (determined by
ECM according to the input signals) is in-
dicated.

• The advance angle becomes larger as

the value increases.

INT/V SOL (B2) [%]

AIR COND RLY
[ON/OFF]

• The air conditioner relay control condi-

tion (determined by ECM according to
the input signals) is indicated.

FUEL PUMP RLY
[ON/OFF]

• Indicates the fuel pump relay control con-

dition determined by ECM according to
the input signals.

VENT CONT/V
[ON/OFF]

• The control condition of the EVAP canis-

ter vent control valve (determined by
ECM according to the input signals) is in-
dicated.
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/OFF]

×

• The control condition of the cooling fan

(determined by ECM according to the in-
put signals) is indicated.
HI: High 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 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

learning
YET: Idle Air Volume Learning has not
been performed yet.
CMPLT: Idle Air Volume Learning has al-
ready been performed successfully.

TRVL AFTER MIL
[km] or [mile]

• Distance traveled while MIL is activated.

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

EC-70

< FUNCTION DIAGNOSIS >

[VK56DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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

ACTIVE TEST MODE

Test Item

A/F S1 HTR (B1)
[%]

• A/F sensor 1 heater control value com-

puted by ECM according to the input sig-
nals.

• 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

pressure sensor is displayed.

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

• The vehicle speed computed from the

vehicle speed signal sent from combina-
tion meter 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 CAN-

CEL switch signal.

RESUME/ACC SW
[ON/OFF]

• Indicates [ON/OFF] condition from RE-

SUME/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.

DIST SW
[ON/OFF]

• Indicates [ON/OFF] condition from DIS-

TANCE switch signal.

ALT DUTY [%]

• Indicates the duty ratio of the power gen-

eration command value. The ratio is cal-
culated by ECM based on the battery
current sensor signal.

BAT CUR SEN [mV]

• The signal voltage of battery current sen-

sor is displayed.

ALT DUTY SIG
[ON/OFF]

• The control condition of the power gener-

ation voltage variable control (deter-
mined by ECM according 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 stored in

ECM. The factor is calculated from the
difference between the target air/fuel ra-
tio stored in ECM and the air-fuel ratio
calculated from air fuel ratio (A/F) sensor
1 signal.

A/F ADJ-B2

Monitored item

[Unit]

ECM IN-

PUT SIG-

NALS

MAIN

SIGNALS

Description

Remarks

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-71

< FUNCTION DIAGNOSIS >

[VK56DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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

DTC & SRT CONFIRMATION MODE

SRT STATUS Mode

For details, refer to

EC-459, "DTC Index"

.

SRT WORK SUPPORT Mode

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

DTC WORK SUPPORT Mode

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-III.

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-III.

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
• Selector lever: P or N
• Cut off each injector signal one at

a time using CONSULT-III.

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 and OFF

using CONSULT-III.

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-III.

If trouble symptom disappears, 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-III and lis-
ten to operating sound.

Fuel pump relay makes the operat-
ing sound.

• Harness and connectors
• Fuel pump relay

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-III.

Engine speed changes according to
the opening percent.

• Harness and connectors
• Solenoid valve

FUEL/T TEMP
SEN

• Change the fuel tank temperature using CONSULT-III.

VENT CON-
TROL/V

• Ignition switch: ON

(Engine stopped)

• Turn solenoid valve ON and OFF

with the CONSULT-III 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

trouble condition

• Change intake valve timing using

CONSULT-III.

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-III.

Battery voltage changes.

• Harness and connectors
• IPDM E/R
• Alternator