Infiniti FX35, FX50 (S51). Manual - part 1182

ECM

HAC-125

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

FAN DUTY

• Engine: Running

0 - 100%

ALT DUTY

• Engine: Idle

0 - 80%

BAT CUR SEN

• Engine speed: Idle

• Battery: Fully charged*

2

• Selector lever: P or N position
• A/C switch: OFF
• No  load

Approx. 2,600 - 3,500 mV

A/F ADJ-B1

• Engine: Running

−

0.330 - 0.330

A/F ADJ-B2

• Engine: Running

−

0.330 - 0.330

TP SEN 1-B2

• Ignition switch: ON

(Engine stopped)

• Selector lever: D position

Accelerator pedal: Fully released

More than 0.36 V

Accelerator pedal: Fully depressed

Less than 4.75 V

TP SEN 2-B2*

1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D position

Accelerator pedal: Fully released

More than 0.36 V

Accelerator pedal: Fully depressed

Less than 4.75 V

P/N POSI SW

• Ignition switch: ON

Selector lever: P or N

ON

Selector lever: Except above position

OFF

INT/A TEMP SE

• Ignition switch: ON

Indicates intake air temper-
ature

AC PRESS SEN

• Engine: Idle
• Both A/C switch and blower fan switch: ON (Compressor operates)

1.0 - 4.0 V

VTC DTY EX B1

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

0% - 2%

Around 2,500 rpm while the engine speed 
is rising

Approx. 0% - 70%

VTC DTY EX B2

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

0 - 2%

Around 2,500 rpm while the engine speed 
is rising

Approx. 0 - 70%

INT/V TIM (B1)

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

−

5 - 5

°

CA

2,000 rpm

Approx. 0 - 30

°

CA

INT/V TIM (B2)

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

−

5 - 5

°

CA

2,000 rpm

Approx. 0 - 30

°

CA

VVEL LEARN

• Ignition switch: OFF 

→

 ON

(After warming up)

VVEL learning has not been performed 
yet.

YET

VVEL learning has already been per-
formed successfully.

DONE

VVEL SEN LEARN-B1

• VVEL learning has already been performed successfully

Approx. 0.30 - 0.80 V

VVEL SEN LEARN-B2

• VVEL learning has already been performed successfully

Approx. 0.30 - 0.80 V

VVEL POSITION SEN-
B1

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

Approx. 0.25 - 1.40 V

When revving engine up to 2,000 rpm 
quickly

Approx. 0.25 - 4.75 V

VVEL POSITION SEN-
B2

• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Idle

Approx. 0.25 - 1.40 V

When revving engine up to 2,000 rpm 
quickly

Approx. 0.25 - 4.75 V

VVEL TIM-B1

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

Approx. 0 - 20 deg

When revving engine up to 2,000 rpm 
quickly

Approx. 0 - 90 deg

Monitor Item

Condition

Values/Status

HAC-126

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

ECM

*1: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM internally. Thus, they differ
from ECM terminals voltage signal.

*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

PG-3, "How to Handle Battery"

.

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.

VVEL TIM-B2

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

Approx. 0 - 20 deg

When revving engine up to 2,000 rpm 
quickly

Approx. 0 - 90 deg

FPCM

• Engine: Cranking

HI

• Engine: Idle
• Engine coolant temperature: More than 10

°

C (50

°

F)

LOW

Monitor Item

Condition

Values/Status

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

JMBIA0031GB

JMBIA0032GB

ECM

HAC-127

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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

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)

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

JMBIA0030GB

JMBIA0030GB

JMBIA0033GB

JMBIA0039GB

JMBIA0040GB

HAC-128

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

ECM

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)

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)

—

—

—

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

PBIB0044E

PBIB0045E

PBIB0042E

PBIB0043E