INFINITI QX56 2011 Factory Service Manual

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-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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6
(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

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-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-83
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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48
(L/W) 175
(B) A/F sensor 1 heater (bank 1) Input [Engine is running]
 Warm-up condition
 Idle speed
(More than 140 seconds after start-
ing engine) 2.9 - 8.8 V
49
(LG/
B) 175
(B) Intake valve timing control sole-
noid valve (bank 1)
Output[Engine is running]
 Warm-up condition
 Idle speed
BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Warm-up condition
 Engine speed: 2,000rpm 7 - 12 V
51
(R) 175
(B) Fuel injector driver power supply Output [Engine is running]
 Warm-up condition
 Idle speed
BATTERY VOLTAGE
(11 - 14 V)
[Ignition switch: OFF] 1.5 V
52
(L/R) 175
(B) Heated oxygen sensor 2 heater
(bank 2)
Output[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)
53
(SB) 175
(B) A/F sensor 1 heater (bank 2) Output [Engine is running]
 Warm-up condition
 Idle speed
(More than 140 seconds after start-
ing engine) 2.9 - 8.8 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JPBIA3361ZZ
JMBIA0038GB
JMBIA0037GB
JPBIA3361ZZ
Revision: 2010 May2011 QX56

EC-84
< ECU DIAGNOSIS INFORMATION >[VK56VD]
ECM
54
(G/R) 175
(B) Intake valve timing control sole-
noid valve (bank 2)
Output[Engine is running]
 Warm-up condition
 Idle speed
BATTERY VOLTAGE
(11 - 14 V)
[Engine is running]
 Warm-up condition
 Engine speed: 2,000rpm 7 - 12 V
57
(W) 175
(B) Throttle control motor (Open) Output [Ignition switch: ON]
 Engine: Stopped
 Selector lever: D
 Accelerator pedal: Fully depressed
0 - 14 V
[Ignition switch: ON]
 Engine: Stopped
 Selector lever: D position
 Accelerator pedal: Fully released 0 - 14 V
60
(B) — Shield — — —
63
(R) 175
(B) Throttle control motor (Close) Output [Ignition switch: ON]
 Engine: Stopped
 Selector lever: D position
 Accelerator pedal: In the middle of
releasing operation 0 - 14 V
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ – Signal name Input/
Output
JMBIA0038GB
JMBIA0031GB
JMBIA0032GB
JMBIA0031GB
Revision: 2010 May2011 QX56

ECM
EC-85
< ECU DIAGNOSIS INFORMATION > [VK56VD]
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64
(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

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