Infiniti QX56 (Z62). Manual — part 525
EC-78
< ECU DIAGNOSIS INFORMATION >
[VK56VD]
ECM
Terminal No.
(Wire color)
Description
Condition
Value
(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
ECM
EC-79
< ECU DIAGNOSIS INFORMATION >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
Terminal No.
(Wire color)
Description
Condition
Value
(Approx.)
+
–
Signal name
Input/
Output
JPBIA3345ZZ
JPBIA3347ZZ
JPBIA3355ZZ
JPBIA3356ZZ
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
Terminal No.
(Wire color)
Description
Condition
Value
(Approx.)
+
–
Signal name
Input/
Output
JPBIA3355ZZ
JPBIA3356ZZ
JPBIA3355ZZ
JPBIA3356ZZ
ECM
EC-81
< ECU DIAGNOSIS INFORMATION >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
23
(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)
—
—
—
Terminal No.
(Wire color)
Description
Condition
Value
(Approx.)
+
–
Signal name
Input/
Output
JPBIA3357ZZ
JPBIA3358ZZ
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