2011 INFINITI QX56 air condition

EC-74
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
INT/V SOL (B2) Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle 0 - 2%
2,000 rpm Approx. 0 - 50%
AIR COND RLY  Engine: After warming up, idle
the engine A/C switch: OFF OFF
A/C switch: ON
(Compressor operates)
ON
VENT CONT/V  Ignition switch: ON OFF
THRTL RELAY  Ignition switch: ON ON
A/F S1 HTR (B1)  Engine: After warming up, idle the engine
(More than 140 seconds after starting engine) 4 - 100%
A/F S1 HTR (B2)  Engine: After warming up, idle the engine
(More than 140 seconds after starting engine) 4 - 100%
HO2S2 HTR (B1)  Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load ON
 Engine speed: Above 3,600 rpm OFF
HO2S2 HTR (B2)  Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load ON
 Engine speed: Above 3,600 rpm OFF
ALT DUTY SIG  Power generation voltage variable control: Operating ON
 Power generation voltage variable control: Not operating OFF
I/P PULLY SPD  Vehicle speed: More than 20 km/h (12 MPH) Almost the same speed as
the tachometer indication
VEHICLE SPEED  Turn drive wheels and compare CONSULT-III value with the speedometer in-
dication. Almost the same speed as
the speedometer indication
IDL A/V LEARN  Engine: Running Idle air volume learning has not been per-
formed yet.
YET
Idle air volume learning has already been
performed successfully. CMPLT
TRVL AFTER MIL  Ignition switch: ON Vehicle has traveled after MIL has illumi-
nated.0 - 65,535 km
(0 - 40,7
23 miles)
SNOW MODE SW  Ignition switch: ON Snow mode switch: ON ON
Snow mode switch: OFF OFF
ENG OIL TEMP  Engine: After warming up More than 70 °C (158 °F)
MAIN SW  Ignition switch: ON MAIN switch: Pressed ON
MAIN switch: Released OFF
CANCEL SW  Ignition switch: ON CANCEL switch: Pressed ON
CANCEL switch: Released OFF
RESUME/ACC SW  Ignition switch: ON RESUME/ACCELERATE switch:
Pressed
ON
RESUME/ACCELERATE switch: Re-
leased OFF
SET SW  Ignition switch: ON SET/COAST switch: Pressed ON
SET/COAST switch: Released OFF
BRAKE SW1
(ASCD/ICC brake
switch)  Ignition switch: ON
Brake pedal: Fully released ON
Brake pedal: Slightly depressed OFF
Monitor Item Condition Values/Status
Revision: 2010 May2011 QX56

ECM
EC-75
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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BRAKE SW2
(Stop lamp switch)
 Ignition switch: ON Brake pedal: Fully released OFF
Brake pedal: Slightly depressed ON
DIST SW  Ignition switch: ON DISTANCE switch: Pressed ON
DISTANCE switch: Released OFF
CRUISE LAMP  Ignition switch: ON MAIN switch: Pressed at the 1st time
→
at the 2nd time ON
→ OFF
AC EVA TEMP  Engine: Running Indicates A/C evaporator
temperature sent from“uni-
fied meter and A/C amp.”.
AC EVA TARGET  Engine: Running Indicates target A/C evapo-
rator temperature sentfrom
“unified meter and A/C
amp.”.
FAN DUTY  Engine: Running 0 - 100%
ALT DUTY  Engine: Idle 0 - 80%
BAT CUR SEN  Engine speed: Idle
 Battery: Fully charged*
2
 Selector lever: P or N position
 A/C switch: OFF
No load Approx. 2,600 - 3,500 mV
A/F ADJ-B1  Engine: Running −0.330 - 0.330
A/F ADJ-B2  Engine: Running −0.330 - 0.330
P/N POSI SW  Ignition switch: ON Selector lever: P or N ON
Selector lever: Except above position OFF
INT/A TEMP SE  Ignition switch: ON Indicates intake air temper-
ature
AC PRESS SEN  Engine: Idle
 Both A/C switch and blower fan switch: ON (Compressor operates) 1.0 - 4.0 V
FUEL PRES SEN  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 2.74 Mpa
2,000 rpm Approx. 3.0 Mpa
FUEL INJ B1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 1.4 msec
2,000 rpm Approx. 1.0 msec
FUEL INJ B2  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 1.4 msec
2,000 rpm Approx. 1.0 msec
INT/V TIM (B1)  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
−5 - 5 °CA
2,000 rpm Approx. 0 - 30 °CA
INT/V TIM (B2)  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
−5 - 5 °CA
2,000 rpm Approx. 0 - 30 °CA
MAP SENSOR  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 1.0 V
2,000 rpm Approx. 1.35 V
EVAP LEAK DIAG  Ignition switch: ON Indicates the condition of
EVAP leak diagnosis.
Monitor Item Condition Values/Status
Revision: 2010 May2011 QX56

EC-76
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
EVAP DIAG READY  Ignition switch: ON Indicates the ready condi-
tion of EVAP leak diagnosis.
VVEL LEARN  Ignition switch: OFF
→ ON
(After warming up) VVEL learning has no
t been performed
yet. YET
VVEL learning has already been per-
formed successfully. DONE
VVEL SEN LEARN-B1  VVEL learning has already been performed successfully Approx. 0.30 - 0.80 V
VVEL SEN LEARN-B2  VVEL learning has already been performed successfully Approx. 0.30 - 0.80 V
VVEL POSITION SEN-
B1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0.25 - 1.50 V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75 V
VVEL POSITION SEN-
B2  Engine: After warming up
 Selector lever: P or N position
 Air conditioner switch: OFF
No load Idle Approx. 0.25 - 1.50 V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75 V
VVEL TIM-B1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0 - 23 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
VVEL TIM-B2  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0 - 23 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
FPCM  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load  Engine: Cranking HI
 Revving engine from idle to 4,000 rpm
quickly MID
 Engine: Idle
 Engine coolant temperature: More than 10 °C (50 °F) LOW
BAT TEMP SEN  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
Indicates the temperature
around the battery.
COOLING FAN SPD  Engine speed: Idle
 Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Water temp: Less than 98
°C Approx. 100 – 200 rpm
Water temp: More than 98 °C Approx. 600 – 700 rpm
THRTL STK CNT B1 NOTE:
The item is indicated, but not used. —
HO2 S2 DIAG2(B1) NOTE:
The item is indicated, but not used.
—
HO2 S2 DIAG2(B2) NOTE:
The item is indicated, but not used. —
FUEL INJ TIMG Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 16 deg
2,000 rpm Approx.
−170 deg
H/P FUEL PUMP DEG  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 211.0 deg
2,000 rpm Approx. 206.0 deg
Monitor Item Condition Values/Status
Revision: 2010 May2011 QX56

ECM
EC-77
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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*1: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, the
y differ
from ECM terminals voltage signal.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to PG-159, "
How to Handle Battery".
TERMINAL LAYOUT
PHYSICAL VALUES
NOTE:
 Specification data are reference values and are measured between each terminals.
 Pulse signal is measured by CONSULT-III.
FUEL PRES SEN V Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 1150 mV
2,000 rpm Approx. 1200 mV
L/FUEL PRES SEN  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 0.45 MPa
2,000 rpm Approx. 0.45 MPa
L/FUEL PRES SEN V  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle Approx. 3250 mV
3,000 rpm Approx. 3100 mV
ECM TEMP 1  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
Indicates the temperature of
ECM internal circuit 1.
ECM TEMP 2  Engine: After warming up
 Selector lever: P or N position
 A/C switch: OFF
No load Idle
Indicates the temperature of
ECM internal circuit 2.
FUEL PUMP DUTY  Engine: After warming up
 Shift lever: P or N
 Air conditioner switch: OFF
No load Engine speed: Idle 30 - 40%
Monitor Item Condition Values/Status
JPBIA3371ZZ
Revision: 2010 May2011 QX56

EC-80
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
12
(Y)
13
(L/B) 14
(BR/ Y)
15
(LG/ R) 175
(B) Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 3
Ignition signal No. 4
Input[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle 0 - 0.2 V
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm 0.1 - 0.4 V
17
(P/L) 18
(Y/R) 19
(G/Y)
20
(O) 175
(B) Ignition signal No. 5
Ignition signal No. 6
Ignition signal No. 7
Ignition signal No. 8
Input[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle 0 - 0.2 V
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm 0.1 - 0.4 V
21
(G/O) 25
(LG) Intake air temperature sensor Input [Engine is running] 0 - 4.8 V
Output voltage varies with intake
air temperature.
22
(BR/ W) 25
(LG) Mass air flow sensor Input [Engine is running]
 Warm-up condition
 Idle speed
0.9 - 1.1 V
[Engine is running]
 Warm-up condition
 Engine speed: 2,500 rpm 1.4 - 1.9 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3355ZZ
JPBIA3356ZZ
JPBIA3355ZZ
JPBIA3356ZZ
Revision: 2010 May2011 QX56

ECM
EC-81
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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(V) 45
(L/O) Low fuel pressure sensor Input [Engine is running]
 Warm-up condition
 Idle speed
2.4 - 3.6 V
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm 2.4 - 3.6 V
25
(LG) —Sensor ground
[Mass air flow sensor/ Intake air
temperature sensor] —— —
27
(P) 45
(L/O) Sensor power supply
(Power steering pressure sen-
sor/ Low fuel pressure sensor/
Electrically-controlled cooling
fan coupling)
— [Ignition switch: ON] 5 V
28
(SB) 40
(W/L) Sensor power supply
(Fuel rail pressure sensor/En-
gine oil pressure sensor)
— [Ignition switch: ON] 5 V
29
(W) 35
(—) Knock sensor (bank 1) Input [Engine is running]
 Idle speed
2.0 V*
1
31
(V/W) 40
(W/L) Fuel rail pressure sensor Input [Engine is running]
 Warm-up condition
 Idle speed
0.98 - 1.2 V
[Engine is running]
 Warm-up condition
 Revving engine from idle to 4,000 rpm quickly 1.1 - 2.9 V
32
(R) 40
(W/L) Engine coolant temperature
sensor
Input [Engine is running] 0 - 4.8 V
Output voltage varies with engine
coolant temperature.
33
(W) 35
(—) Knock sensor (bank 2) Input [Engine is running]
 Idle speed
2.0 V*
1
35
(—) —Sensor ground
(Knock sensor)
—— —
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3357ZZ
JPBIA3358ZZ
Revision: 2010 May2011 QX56

EC-86
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
78
(L/R) 175
(B) A/F sensor 1 (bank 2) Input [Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm2.2 - 2.8V
Output voltage varies with air fuel
ratio.
79
(B) 97
(W) Throttle position sensor 2 Input [Ignition switch: ON]
 Engine: Stopped
 Selector lever: D position
 Accelerator pedal: Fully released
Less than 4.75 V
[Ignition switch: ON]
 Engine: Stopped
 Selector lever: D position
 Accelerator pedal: Fully depressed More than 0.36 V
80
(L/W) 175
(B) A/F sensor 1 (bank 2) Input [Ignition switch: ON] 3.0 V
81
(G) 97
(W) Sensor power supply
[Throttle position sensor (bank
1)]
— [Ignition switch: ON] 5 V
83
(LG/ R) 99
(LG/ B) Sensor power supply
[Camshaft position sensor (bank
2)]
— [Ignition switch: ON] 5 V
85
(GR/
R) 70
(W/L) Sensor power supply
(Manifold absolute pressure
sensor)
— [Ignition switch: ON] 5 V
86
(R/ W) 98
(G/ W) Crankshaft position sensor Input [Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle 4.0 - 5.0 V
[Engine is running]
 Engine speed: 2,000 rpm 4.0 - 5.0 V
87
(L/W) 100
(R) Heated oxygen sensor 2 (bank
2)
Input[Engine is running]
 Revving engine from idle to 3,000
rpm quickly after the following condi-
tions are met
- Engine: after warming up
- Keeping the engine speed between
3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no
load 0 - 1.0 V
88
(B) 175
(B) A/F sensor 1 (bank 1) Input [Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm2.2 - 2.8 V
Output voltage varies with air fuel
ratio.
90
(W) 175
(B)
A/F sensor 1 (bank 1) Input [Ignition switch: ON] 3.0 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JMBIA0041GB
JMBIA0042GB
Revision: 2010 May2011 QX56

ECM
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
*1: This may vary depending on internal resistance of the tester.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to PG-159, "
How to Handle Battery".
Fail-safeINFOID:0000000006217731
NON DTC RELATED ITEM
DTC RELATED ITEM
169
(G/B) 175
(B) Engine speed signal output Input [Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle 0 - 7.0 V
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm 0 - 7.0 V
171 (W) 175
(B) Power supply for ECM Input [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14 V)
172 (W) 175
(B) Power supply for ECM Input [Ignition switch: ON] BATTERY VOLTAGE
(11 - 14 V)
173 (O) 175
(B) Throttle contro
l motor power
supply Input [Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
174 (B) — ECM ground — — —
175 (B) — ECM ground — — —
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
OutputJPBIA3352ZZ
JPBIA3354ZZ
Detected items Engine operating condition
in fail-safe mode RemarksReference
page
Malfunction indicator
circuit Engine speed will not rise
more than 2,500 rpm due
to the fuel cut When there is an open circuit on MIL circuit, the ECM cannot warn
the driver by illuminating MIL when there is malfunction on engine
control system.
Therefore, when electrical controlled throttle and part of ECM related
diagnoses are continuously detected as NG for 5 trips, ECM warns
the driver that engine control system malfunctions and MIL circuit is
open by means of operating the fail-safe function.
The fail-safe function also operates when above diagnoses except
MIL circuit are detected and demands the driver to repair the malfunc-
tion. EC-515
Revision: 2010 May2011 QX56