Infiniti FX35, FX50 (S51). Manual - part 899

ECM

EC-1137

< ECU DIAGNOSIS INFORMATION >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

TERMINAL LAYOUT

PHYSICAL VALUES

NOTE:
• ECM is located behind the instrument assist lower panel. For this inspection, remove passenger side instru-

ment lower panel.

• Specification data are reference values and are measured between each terminals.
• Pulse signal is measured by CONSULT-III.

JMBIA0070ZZ

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

1

(P)

128

(B)

Throttle control motor power 
supply (bank 2)

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

2

(L)

128

(B)

Throttle control motor (bank 2) 
(Open)

Output

[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D position
• Accelerator pedal: Fully depressed

0 - 14 V

[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D position
• Accelerator pedal: Fully released

0 - 14 V

3

(Y)

128

(B)

A/F sensor 1 heater
(bank 1)

Output

[Engine is running]
• Warm-up condition
• Idle speed

(More than 140 seconds after start-
ing engine)

2.9 - 8.8 V

4

(G)

128

(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

JMBIA0031GB

JMBIA0032GB

JMBIA0030GB

JMBIA0030GB

EC-1138

< ECU DIAGNOSIS INFORMATION >

[VK50VE]

ECM

5

(R)

128

(B)

Throttle control motor (bank 2) 
(Close)

Output

[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D position
• Accelerator pedal: In the middle of 

releasing operation

0 - 14 V

6

(GR)

—

ECM ground

—

—

—

8

(W)

128

(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)

9

(G)

128

(B)

Ignition signal No. 2

Output

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending 
on rpm at idle

0 - 0.2 V

10

(Y)

Ignition signal No. 1

13

(V)

Ignition signal No. 3

14

(GR)

Ignition signal No. 4

18

(SB)

Ignition signal No. 5

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

0.1 - 0.4 V

22

(LG)

Ignition signal No. 6

26

(L)

Ignition signal No. 7

30

(Y)

Ignition signal No. 8

15

(O)

128

(B)

ECM relay (Self shut-off)

Output

[Engine is running]
[Ignition switch: OFF]
• A few seconds after turning ignition 

switch OFF

0 - 1.5 V

[Ignition switch: OFF]
• More than a few seconds after turn-

ing ignition switch OFF

BATTERY VOLTAGE
(11 - 14 V)

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

JMBIA0033GB

JMBIA0039GB

JMBIA0040GB

PBIB0044E

PBIB0045E

ECM

EC-1139

< ECU DIAGNOSIS INFORMATION >

[VK50VE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

17

(R)

128

(B)

Fuel injector No. 3

Output

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending 
on rpm at idle

BATTERY VOLTAGE

(11 - 14 V)

21

(W)

Fuel injector No. 2

25

(P)

Fuel injector No. 1

29

(O)

Fuel injector No. 7

33

(G)

Fuel injector No. 8

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14 V)

37

(BR)

Fuel injector No. 4

41

(W)

Fuel injector No. 5

45

(V)

Fuel injector No. 6

19

(L)

128

(B)

Throttle control motor relay

Output

[Ignition switch: ON 

→

 OFF]

0 - 1.0 V 

↓

BATTERY VOLTAGE 
(11 - 14 V) 

↓

0 V

[Ignition switch: ON]

0 - 1.0 V

23

(BR)

—

Sensor ground
(Engine coolant temperature 
sensor)

—

—

—

24

(Y)

23

(BR)

Engine coolant temperature 
sensor

Input

[Engine is running]

0 - 4.8 V
Output voltage varies with engine 
coolant temperature.

31

(B)

—

Sensor ground
(Heated oxygen sensor 2)

—

—

—

32

(W)

31

(B)

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

34

(V)

—

Sensor ground
(Engine oil temperature sen-
sor)

—

—

—

35

(B/W)

—

Sensor ground
(Knock sensor)

—

—

—

36

(LG)

31

(B)

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

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

PBIB0042E

PBIB0043E

EC-1140

< ECU DIAGNOSIS INFORMATION >

[VK50VE]

ECM

38

(GR)

—

Sensor ground
[Mass air flow sensor (bank 2)]

—

—

—

39

(R)

34

(V)

Engine oil temperature sensor

Input

[Engine is running]

0 - 4.8 V
Output voltage varies with engine 
oil temperature.

40

(W)

35

(B/W)

Knock sensor (bank 1)

Input

[Engine is running]
• Idle speed

2.5 V*

1

42

(B)

—

Sensor ground
[Mass air flow sensor (bank 1)/ 
Intake air temperature sensor]

—

—

—

43

(SB)

38

(GR)

Mass air flow sensor (bank 2)

Input

[Engine is running]
• Warm-up condition
• Idle speed

0.8 - 1.1 V

[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm

1.3 - 1.6 V

44

(W)

35

(B/W)

Knock sensor (bank 2)

Input

[Engine is running]
• Idle speed

2.5 V*

1

47

(L)

42

(B)

Mass air flow sensor (bank 1)

Input

[Engine is running]
• Warm-up condition
• Idle speed

0.8 - 1.1 V

[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm

1.3 - 1.6 V

48

(Y)

42

(B)

Intake air temperature sensor

Input

[Engine is running]

0 - 4.8 V
Output voltage varies with intake 
air temperature.

49

(V)

128

(B)

Throttle control motor power 
supply (bank 1)

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

50

(G)

128

(B)

Throttle control motor (bank 1) 
(Open)

Output

[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D position
• Accelerator pedal: Fully depressed

0 - 14 V

[Ignition switch: ON]
• Engine: Stopped
• Selector lever: D position
• Accelerator pedal: Fully released

0 - 14 V

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

JMBIA0031GB

JMBIA0032GB