2011 INFINITI QX56 ground

PRECAUTIONSEC-13
< PRECAUTION > [VK56VD]
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When installing C.B. ham radio or a mobile phone, be sure to
observe the following as it may adversely affect electronic
control systems depending on installation location.
- Keep the antenna as far as possi ble from the electronic con-
trol units.
- Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Never let them run parallel for a long distance.
- Adjust the antenna and feeder line so that the standing-wave
ratio can be kept smaller.
- Be sure to ground the radio to vehicle body.
SEF708Y
Revision: 2010 May2011 QX56

EC-34
< SYSTEM DESCRIPTION >[VK56VD]
STRUCTURE AND OPERATION
On Board Refueling V apor Recovery (ORVR)
INFOID:0000000006217696
From the beginning of refueling, the air and vapor insi de the fuel tank go through refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.
WARNING:
When conducting inspections below, be sure to observe the following:
 Put a “CAUTION: FLAMMABLE” sign in workshop.
 Never smoke while servicing fuel system. Keep open flames and sparks away from work area.
 Always furnish the workshop with a CO
2 fire extinguisher.
CAUTION:
 Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosion-pr oof container and put lid on securely.
- Release fuel pressure from fuel line. Refer to EC-153, "
Work Procedure".
- Disconnect battery ground cable.
 Always replace O-ring when the fuel gauge retainer is removed.
 Never kink or twist hose and tube when they are installed.
 Never tighten hose and clamps excessively to avoid damaging hoses.
 After installation, run engine an d check for fuel leaks at connections.
 Never attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fu el overflow, resulting in fuel spray and possibly a fire.
PBIB1068E
Revision: 2010 May2011 QX56

EC-78
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
1
(R)
2
(R) 175
(B) Fuel injector No. 8 (HI)
Fuel injector No. 5 (HI)
Output[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm BATTERY VOLTAGE
(11 - 14 V)
3
(G)
4
(G) 175
(B) Fuel injector No. 3 (LO)
Fuel injector No. 2 (LO)
Input[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm BATTERY VOLTAGE
(11 - 14 V)
5
(B/R) — ECM ground — — —
JPBIA3345ZZ
JPBIA3347ZZ
JPBIA3355ZZ
JPBIA3356ZZ
Revision: 2010 May2011 QX56

ECM
EC-79
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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(R) 7
(R) 175
(B) Fuel injector No. 3 (HI)
Fuel injector No. 2 (HI)
Output[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm BATTERY VOLTAGE
(11 - 14 V)
8
(G) 9
(G) 175
(B) Fuel injector No. 8 (LO)
Fuel injector No. 5 (LO)
Input[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm BATTERY VOLTAGE
(11 - 14 V)
10
(B) — ECM ground — — —
11
(BR) 175
(B) PNP switch Input [Ignition switch: ON]
 Selector lever: P or N position
BATTERY VOLTAGE
(11 - 14 V)
[Ignition switch: ON]
 Selector lever: Except above posi- tion 0 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
OutputJPBIA3345ZZ
JPBIA3347ZZ
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-82
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
37
(V) 175
(B) Cooling fan speed Input [Ignition switch: ON]
 Engine stopped
5 V
[Engine is running]
 Idle speed
 After warm-up condition BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Idle speed
 Before warm-up condition BATTERY VOLTAGE
(11 - 14 V)
39
(P/B) 45
(L/O) Power steering pressure sensor Input [Engine is running]
 Steering wheel: Being turned
0.5 - 4.5 V
[Engine is running]
 Steering wheel: Not being turned 0.4 - 0.8 V
40
(W/L) —Sensor ground
(Fuel rail pressure sensor/En-
gine coolant temperature sen-
sor/Engine oil temperature
sensor) —— —
42
(L/Y) 40
(W/L) Engine oil temperature sensor Input [Engine is running] 0 - 4.8 V
Output voltage varies with engine
oil temperature.
45
(L/O) —Sensor ground
(Power steering pressure sen-
sor/ Low fuel pressure sensor/
Electrically-controlled cooling
fan coupling) —— —
46
(SB) 175
(B) Fuel injector driver power supply Input [Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
[Ignition switch: OFF] 1.5 V
47
(G) 175
(B) Heated oxygen sensor 2 heater
(bank 1)
Input[Engine is running]
 Engine speed: Below 3,600 rpm af-
ter 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 10 V
[Ignition switch: ON]
 Engine: Stopped
[Engine is running]
 Engine speed: Above 3,600 rpm BATTERY VOLTAGE
(11 - 14 V)
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3332ZZ
JPBIA3733ZZ
JMBIA0037GB
Revision: 2010 May2011 QX56

ECM
EC-85
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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(V/W) 175
(B) EVAP canister purge volume
control solenoid valve
Output[Engine is running]
 Idle speed
 Accelerator pedal: Not depressed
even slightly, after engine starting BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Engine speed: About 2,000 rpm (More than 100 seconds after start-
ing engine) BATTERY VOLTAGE
(11 - 14 V)
67
(V) 175
(B) Manifold absolute pressure sen-
sor
Input[Engine is running]
 Warm-up condition
 Idle speed
1.2 V
[Engine is running]
 Warm-up condition
 Engine speed: 2,000 rpm 1.5 V
68
(BR/
W) —
Sensor ground
[Camshaft position sensor (bank
1)] —— —
70
(W/L) —Sensor ground
(Manifold absolute pressure
sensor)
—— —
73
(P) 99
(LG/ B) Camshaft position sensor (bank
2)
Input[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle 3.0 - 5.0 V
[Engine is running]
 Engine speed: 2,000 rpm 3.0 - 5.0 V
74
(L) 175
(B) A/F sensor 1 (bank 2) Input [Ignition switch: ON] 2.5 V
76
(W/
G) 98
(G/
W) Sensor power supply
(Crankshaft position sensor)
— [Ignition switch: ON] 5 V
77
(Y/R) 68
(BR/ W) Sensor power supply
[Camshaft position sensor (bank
1)]
— [Ignition switch: ON] 5 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
OutputJMBIA0039GB
JMBIA0040GB
JMBIA0045GB
JMBIA0046GB
Revision: 2010 May2011 QX56

ECM
EC-87
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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(R) 97
(W) Throttle position sensor 1 Input [Ignition switch: ON]
 Engine: Stopped
 Selector lever: D position
 Accelerator pedal: Fully released
More than 0.36 V
[Ignition switch: ON]
 Engine: Stopped
 Selector lever: D position
 Accelerator pedal: Fully depressed Less than 4.75 V
94
(R) 175
(B) A/F sensor 1 (bank 1) Input [Ignition switch: ON] 2.0 V
95
(L/R) 68
(BR/
W) Camshaft position sensor (bank
1)
Input[Engine is running]
 Warm-up condition
 Idle speed
NOTE:
The pulse cycle changes depending
on rpm at idle 3.0 - 5.0 V
[Engine is running]
 Engine speed: 2,000 rpm 3.0 - 5.0 V
96
(W/ R) 100
(R) Heated oxygen sensor 2 (bank
1)
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
97
(W) —Sensor ground
[Throttle position sensor (bank
1)] —— —
98
(G/ W) —
Sensor ground
(Crankshaft position sensor)
—— —
99
(LG/ B) —Sensor ground
[Camshaft position sensor (bank
2)] —— —
100 (R) —Sensor ground
(Heated oxygen sensor 2) —— —
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JMBIA0045GB
JMBIA0046GB
Revision: 2010 May2011 QX56