2007 INFINITI QX56 Factory Service Manual

headlights coolant instrument panel fuel fill door release oil airbag disable

Page 1193 of 3061

INFINITI QX56 2007 Factory Service Manual EC-110
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
98 G/RAccelerator pedal position
sensor 2[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully released0.25 - 0.50V
[Ignition switch:

EC-110
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
98 G/RAccelerator pedal position
sensor 2[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully released0.25 - 0.50V
[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully depressed2.0 - 2.5V
99 G/YASCD steering switch
(Models with ICC system)[Ignition switch: ON]
• ICC steering switch: OFFApproximately 4.3V
[Ignition switch: ON]
• MAIN switch: PressedApproximately 0V
[Ignition switch: ON]
• CANCEL switch: PressedApproximately 1.3V
[Ignition switch: ON]
• RESUME/ACCELERATE switch: PressedApproximately 3.7V
[Ignition switch: ON]
• SET/COAST switch: PressedApproximately 3V
[Ignition switch: ON]
• DISTANCE switch: PressedApproximately 2.2V
99 G/YASCD steering switch
(Models with ASCD system)[Ignition switch: ON]
• ASCD steering switch: OFFApproximately 4V
[Ignition switch: ON]
• MAIN switch: PressedApproximately 0V
[Ignition switch: ON]
• CANCEL switch: PressedApproximately 1V
[Ignition switch: ON]
• RESUME/ACCELERATE switch: PressedApproximately 3V
[Ignition switch: ON]
• SET/COAST switch: PressedApproximately 2V
101 R/W Stop lamp switch[Ignition switch: OFF]
• Brake pedal: Fully releasedApproximately 0V
[Ignition switch: OFF]
• Brake pedal: Slightly depressedBATTERY VOLTAGE
(11 - 14V)
102 GR/R PNP switch[Ignition switch: ON]
• Selector lever: P or NApproximately 0V
[Ignition switch: ON]
• Except the above gear positionBATTERY VOLTAGE
(11 - 14V)
104 O Throttle control motor relay[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]0 - 1.0V
106 BR/WAccelerator pedal position
sensor 1[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully released0.5 - 1.0V
[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully depressed4.2 - 4.8V
107 V/R Fuel tank temperature sensor[Engine is running]Approximately 0 - 4.8V
Output voltage varies with fuel
tank temperature. TER-
MI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)

Page 1194 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
EC-111
< SERVICE INFORMATION >
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
*:Before measuring the termi

TROUBLE DIAGNOSIS
EC-111
< SERVICE INFORMATION >
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
*:Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to SC-4
.
CONSULT-II Function (ENGINE)INFOID:0000000003531626
FUNCTION
108 BR/WICC brake switch
(Models with ICC system)
ASCD brake switch
(Models with ASCD system)[Ignition switch: ON]
• Brake pedal: Slightly depressedApproximately 0V
[Ignition switch: ON]
• Brake pedal: Fully releasedBATTERY VOLTAGE
(11 - 14V)
109 L/W Ignition switch[Ignition switch: OFF]0V
[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
111 W / BECM relay
(Self shut-off)[Engine is running]
[Ignition switch: OFF]
• For a few seconds after turning ignition
switch OFF0 - 1.5V
[Ignition switch: OFF]
• More than a few seconds after turning igni-
tion switch OFFBATTERY VOLTAGE
(11 - 14V)
11 3 G R F u e l p u m p r e l a y[Ignition switch: ON]
• For 1 second after turning ignition switch
ON
[Engine is running]0 - 1.5V
[Ignition switch: ON]
• More than 1 second after turning ignition
switch ONBATTERY VOLTAGE
(11 - 14V)
11 5
11 6B
B/WECM ground[Engine is running]
• Idle speedBody ground
11 7 L / YEVAP canister vent control
valve[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
11 9
120BR
BRPower supply for ECM[Ignition switch: ON]BATTERY VOLTAGE
(11 - 14V)
121 WPower supply for ECM
(Back-up)[Ignition switch: OFF]BATTERY VOLTAGE
(11 - 14V) TER-
MI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
Diagnostic test mode Function
Work supportThis mode enables a technician to adjust some devices faster and more accurately by following the in-
dications on the CONSULT-II unit.
Self-diagnostic resultsSelf-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.*
Data monitor Input/Output data in the ECM can be read.
Data monitor (SPEC)Input/Output of the specification for Basic fuel schedule, AFM, A/F feedback control value and the other
data monitor items can be read.
CAN diagnostic support mon-
itorThe results of transmit/receive diagnosis of CAN communication can be read.
Active testDiagnostic Test Mode in which CONSULT-II drives some actuators apart from the ECMs and also shifts
some parameters in a specified range.
DTC & SRT confirmation The status of system monitoring tests and the self-diagnosis status/result can be confirmed.
Function test This mode is used to inform customers when their vehicle condition requires periodic maintenance.
ECM part number ECM part number can be read.

Page 1195 of 3061

INFINITI QX56 2007 Factory Service Manual EC-112
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
*: The following emission-related diagnostic information is cleared when the ECM memory is erased.
• Diagnostic trouble codes
• 1st trip diagnostic

Page 1196 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
EC-113
< SERVICE INFORMATION >
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X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame d

Page 1197 of 3061

INFINITI QX56 2007 Factory Service Manual EC-114
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
*: 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,

EC-114
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
*: 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-49, "Emission-related Diagnostic Information".
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 APPROPRIATE
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 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 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-9
.)
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
[°C] or [°F]• 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 sched-
ule. 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.
ABSOL TH-P/S
[%]• The throttle valve opening at the moment a malfunction is detected is displayed.

Page 1198 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
EC-115
< SERVICE INFORMATION >
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*: The item is the same as that of 1st trip freeze frame data.
DATA MONITOR MODE
Monitored Item
×: Applicable
B/FUEL S

TROUBLE DIAGNOSIS
EC-115
< SERVICE INFORMATION >
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*: The item is the same as that 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
[°C] or [°F]• The intake air temperature at the moment a malfunction is detected is displayed. Freeze frame data
item*Description
Monitored item
[Unit]ECM IN-
PUT SIG-
NALSMAIN
SIGNALSDescription 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 en-
gine 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 certain
value is indicated.
B/FUEL SCHDL
[msec]×• Base fuel schedule indicates the fuel in-
jection pulse width programmed into
ECM, prior to any learned on board cor-
rection.
A/F ALPHA-B1 [%]×
• The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.• When the engine is stopped, a certain
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 [°F]××• The engine coolant temperature (deter-
mined by the signal voltage of the engine
coolant temperature sensor) is dis-
played.• When the engine coolant temperature
sensor is open or short-circuited, ECM
enters fail-safe mode. The engine cool-
ant temperature determined by the
ECM is displayed.
A/F SEN1 (B1) [V]××
• The A/F signal computed from the input
signal of the A/F sensor 1 is displayed.
A/F SEN1 (B2) [V]×
HO2S2 (B1) [V]×
• The signal voltage of the heated oxygen
sensor 2 is displayed.
HO2S2 (B2) [V]×
HO2S2 MNTR (B1)
[RICH/LEAN]×• Display of heated oxygen sensor 2 sig-
nal:
RICH: means the amount of oxygen after
three way catalyst is relatively small.
LEAN: means the amount of oxygen af-
ter three way catalyst is relatively large.• When the engine is stopped, a certain
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 combina-
tion 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 volt-
age is displayed.• THRTL SEN 2 signal is converted by
ECM internally. Thus, it differs from
ECM terminal voltage signal. THRTL SEN 2 [V]×

Page 1199 of 3061

INFINITI QX56 2007 Factory Service Manual EC-116
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
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 T

EC-116
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
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) switch sig-
nal.
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-
NALSMAIN
SIGNALSDescription Remarks

Page 1200 of 3061

INFINITI QX56 2007 Factory Service Manual TROUBLE DIAGNOSIS
EC-117
< SERVICE INFORMATION >
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PURG VOL C/V [%]• Indicates the EVAP canister purge vol-
ume control solenoid valve control value
computed by the EC

TROUBLE DIAGNOSIS
EC-117
< SERVICE INFORMATION >
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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-
NALSMAIN
SIGNALSDescription Remarks

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