Infiniti QX4 (R50). Manual - part 166

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

42

B/Y

Start signal

[Ignition switch “ON”]

Approximately 0V

[Ignition switch “START”]

9 - 12V

43

R

Ignition switch

[Ignition switch “OFF”]

0V

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

44

L

PNP switch

[Ignition switch “ON”]

I

Gear position is “P” or “N”.

Approximately 0V

[Ignition switch “ON”]

I

Except the above gear position

BATTERY VOLTAGE
(11 - 14V)

45

B/R

Air conditioner switch
signal

[Engine is running]

I

Both A/C switch and blower switch are “ON”.

Approximately 0V

[Engine is running]

I

A/C switch is “OFF”.

Approximately 5V

47

R/B

Power steering oil
pressure switch

[Engine is running]

I

Steering wheel is being turned.

0 - 1.0V

[Engine is running]

I

Steering wheel is not being turned.

Approximately 5V

48

B

ECM ground

[Engine is running]

I

Idle speed

Engine ground

51

BR

A/C cut signal

[Engine is running]

I

Air conditioner is operating.

0 - 0.5V

52

PU

Electrical load signal

[Engine is running]

I

Rear window defogger: ON

I

Hi-beam headlamp: ON

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

I

Electrical load: OFF

0V

55

W/B

Swirl control valve con-
trol vacuum check
switch

[Engine is running]

I

Idle speed

I

Engine coolant temperature is between 15 to
50°C (59 to 122°F).

Approximately 5V

[Engine is running]

I

Idle speed

I

Engine coolant temperature is above 55°C
(131°F).

0 - 1.0V

56

OR/L

Throttle position switch
(Closed position)

[Engine is running]

I

Accelerator pedal fully released

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

I

Accelerator pedal depressed

Approximately 0V

57

B

ECM ground

[Engine is running]

I

Idle speed

Engine ground

58

B/P

Sensors’ ground

[Engine is running]

I

Warm-up condition

I

Idle speed

Approximately 0V

59

B

Fuel level sensor
ground

[Engine is running]

I

Idle speed

Approximately 0V

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

ECM Terminals and Reference Value (Cont’d)

EC-131

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

61

OR

Mass air flow sensor

[Engine is running]

I

Warm-up condition

I

Idle speed

1.2 - 1.8V

[Engine is running]

I

Warm-up condition

I

Engine speed is 2,500 rpm.

1.6 - 2.2V

62

G/B

Heated oxygen sensor
1 (front) (bank 2)

[Engine is running]

I

Warm-up condition

I

Engine speed is 2,000 rpm.

0 - Approximately 1.0V (Peri-
odically change)

SEF059V

63

G

Heated oxygen sensor
1 (front) (bank 1)

[Engine is running]

I

Warm-up condition

I

Engine speed is 2,000 rpm.

0 - Approximately 1.0V (Peri-
odically change)

SEF059V

64

Y/PU

Intake air temperature
sensor

[Engine is running]

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

65
75

LG
LG

Crankshaft position
sensor (REF)

[Engine is running]

I

Warm-up condition

I

Idle speed

Approximately 2.3V

★

(AC voltage)

SEF581X

66
76

L
L

Camshaft position sen-
sor (PHASE)

[Engine is running]

I

Warm-up condition

I

Idle speed

Approximately 4.2V

★

(AC voltage)

SEF582X

12
67

W/R

Power supply for ECM
(Buck-up)

[Ignition switch “OFF”]

BATTERY VOLTAGE
(11 - 14V)

70

LG/R

Engine coolant tem-
perature sensor

[Engine is running]

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

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

ECM Terminals and Reference Value (Cont’d)

EC-132

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

71

OR/L

Heated oxygen sensor
2 (rear) (bank 2)

[Engine is running]

I

Warm-up condition

I

Engine speed is 2,000 rpm.

0 - Approximately 1.0V

72

OR

Heated oxygen sensor
2 (rear) (bank 1)

[Engine is running]

I

Warm-up condition

I

Engine speed is 2,000 rpm.

0 - Approximately 1.0V

73

B/P

Mass air flow sensor
ground

[Engine is running]

I

Warm-up condition

I

Idle speed

Approximately 0V

79

Y/G

Intake valve timing
control position sen-
sors (RH)

[Engine is running]

I

Warm-up condition

I

Idle speed

Approximately 0.5V

SEF351Z

[Engine is running]

I

Warm-up condition

I

Engine speed is 2,000 rpm.

Approximatley 0.5V

SEF352Z

80

L/R

Absolute pressure sen-
sor

[Ignition switch “ON”]

Approximately 4.4V

81

W/PU

Refrigerant pressure
sensor

[Engine is running]

I

Warm-up condition

I

Both A/C switch and blower switch are “ON”.

(Compressor operates.)

0.36 - 3.88V

82

W

Throttle position sensor
signal output

[Engine is running]

I

Warm-up condition

I

Accelerator pedal fully released

Approximately 0.4V

[Ignition switch “ON”]

I

Accelerator pedal fully depressed

Approximately 4V

83

Y/PU

Fuel level sensor

[Ignition switch “ON”]

Approximately 0 - 4.8V
Output voltage varies with
fuel level.

84

L/G

EVAP control system
pressure sensor

[Ignition switch “ON”]

Approximately 3.4V

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

ECM Terminals and Reference Value (Cont’d)

EC-133

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

85

Y

Crankshaft position
sensor (POS)

[Engine is running]

I

Idle speed

Approximately 2.4V

SEF057V

[Engine is running]

I

Engine speed is 2,000 rpm.

Approximately 2.3V

SEF058V

86

W/L

Vehicle speed sensor

[Engine is running]

I

Jack up front wheels.

I

In 1st gear position

I

10 km/h (6 MPH)

Approximately 2.5V

SEF583X

[Engine is running]

I

Jack up front wheels.

I

In 2nd gear position

I

30 km/h (19 MPH)

Approximately 2.0V

SEF584X

89

OR

Intake valve timing
control position sen-
sors (LH)

[Engine is running]

I

Warm-up condition

I

Idle speed

Approximatley 0.5V

SEF351Z

[Engine is running]

I

Warm-up condition

I

Engine speed is 2,000 rpm.

Approximatley 0.5V

SEF352Z

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

ECM Terminals and Reference Value (Cont’d)

EC-134