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