Nissan Altima L32. Manual - part 343

 

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Nissan Altima L32. Manual - part 343

 

 

ECM

EC-493

< ECU DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

38

Ground

R

Throttle position sensor 2

Input

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T)

• Accelerator pedal: Fully re-

leased

Less than 4.75V

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T)

• Accelerator pedal: Fully de-

pressed

More than 0.36V

39

Ground

R

Refrigerant pressure sensor

Input

[Engine is running]
• Warm-up condition
• Both A/C switch and blower 

fan motor switch: ON (Com-
pressor operates)

1.0 - 4.0V

40

Ground

G

Sensor ground
(Refrigerant pressure sen-
sor)

—

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

0V

41

Ground

O/B

Power steering pressure 
sensor

Output

[Engine is running]
• Steering wheel: Being 

turned

0.5 - 4.0V

[Engine is running]
• Steering wheel: Not being 

turned

0.4 - 0.8V

42

Ground

G/R

Battery current sensor

Input

[Engine is running]
• Battery: Fully charged*
• Idle speed

2.6 - 3.5V

44

Ground

R/B

Sensor ground
(Battery current sensor)

—

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

0V

45

Ground

B/W

A/F sensor 1 (bank 1)

Input

[Ignition switch: ON]

2.2V

46

Ground

Y

Engine coolant temperature 
sensor

Input

[Engine is running]

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

47

Ground

G

Sensor power supply
(Throttle position sensor)

—

[Ignition switch: ON]

5V

48

Ground

B/P

Sensor ground
(Power steering pressure 
sensor)

—

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

0V

49

Ground

L

A/F sensor 1

Input

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

1.8V
Output voltage varies with air fuel 
ratio.

50

Ground

L/Y

Intake air temperature sen-
sor

Input

[Engine is running]

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

51

Ground

O/L

Sensor power supply

—

[Ignition switch: ON]

5V

52

Ground

LG

Sensor ground
(Tumble control valve posi-
tion sensor, Engine coolant 
temperature sensor)

—

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

0V

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

EC-494

< ECU DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

ECM

54

Ground

V

Tumble control valve posi-
tion sensor

Input

[Ignition switch ON]
• Engine coolant temperature: 

Between 5

°C (41°F) and 

40

°C (104°F)

• Accelerator pedal: Fully re-

leased

Less than 1.2V

[Ignition switch ON]
• Engine coolant temperature: 

Between 5

°C (41°F) and 

40

°C (104°F)

• Accelerator pedal: Slightly 

depressed

More than 2.9V

55

Ground

R/L

Sensor power supply
(Power steering pressure 
sensor)

—

[Ignition switch: ON]

5V

56

Ground

G/B

Sensor ground
(Mass air flow sensor, Intake 
air temperature sensor)

—

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

0V

58

Ground

O

Mass air flow sensor

Input

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

0.9 - 1.1V

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

1.4 - 1.7V

59

Ground

G/W

Sensor power supply
[Camshaft position sensor 
(PHASE)]

—

[Ignition switch: ON]

5V

60

Ground

Y/B

Sensor ground
[Crankshaft position sensor 
(POS)]

—

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

0V

61

Ground

W

Knock sensor

Input

[Engine is running]
• Idle speed

2.5V

64

Ground

B/R

Sensor ground
[Camshaft position sensor 
(PHASE)]

—

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

0V

65

Ground

W

Crankshaft position sensor 
(POS)

Input

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

NOTE:
The pulse cycle changes de-
pending on rpm at idle

3.0V

[Engine is running]
• Engine speed: 2,000 rpm

3.0V

67

Ground

—

Sensor ground
(Knock sensor)

—

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

0V

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

JMBIA0091GB

JMBIA0092GB

ECM

EC-495

< ECU DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

69

Ground

W/R

Camshaft position sensor 
(PHASE)

Input

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

NOTE:
The pulse cycle changes de-
pending on rpm at idle

1.0 - 4.0

[Engine is running]
• Engine speed is 2,000 rpm

1.0 - 4.0

72

Ground

LG/B

Sensor power supply
(Tumble control valve posi-
tion sensor, Refrigerant 
pressure sensor)

—

[Ignition switch: ON]

5V

76

Ground

R/G

Sensor power supply
[Crankshaft position sensor 
(POS)]

—

[Ignition switch: ON]

5V

77

Ground

W/L

Power supply for ECM 
(Back-up)

Input

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

78

Ground

R/L

Intake valve timing control 
solenoid valve

Output

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

0V

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

7 - 10V

81

Ground

W

Accelerator pedal position 
sensor 1

Input

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully re-

leased

0.5 - 1.0V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully de-

pressed

4.2 - 4.8V

82

Ground

O

Accelerator pedal position 
sensor 2

Input

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully re-

leased

0.25 - 0.5V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully de-

pressed

2.0 - 2.5V

83

Ground

GR

Sensor power supply
(Accelerator pedal position 
sensor 1)

—

[Ignition switch: ON]

5V

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

JMBIA0093GB

JMBIA0094GB

JMBIA0095GB

EC-496

< ECU DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

ECM

84

Ground

B

Sensor ground
(Accelerator pedal position 
sensor 1)

—

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

0V

85

Ground

G/Y

ASCD steering switch

Input

[Ignition switch: ON]
• ASCD steering switch: OFF

4V

[Ignition switch: ON]
• MAIN switch: Pressed

0V

[Ignition switch: ON]
• CANCEL switch: Pressed

1V

[Ignition switch: ON]
• RESUME/ACCELERATE 

switch: Pressed

3V

[Ignition switch: ON]
• SET/COAST switch: 

Pressed

2V

86

Ground

SB

EVAP control system pres-
sure sensor

Input

[Ignition switch: ON]

1.8 - 4.8V

87

Ground

BR

Sensor power supply
(Accelerator pedal position 
sensor 2)

—

[Ignition switch: ON]

5V

88

—

O

Data link connector

Input/

Output

—

—

91

Ground

V

Sensor power supply
(EVAP control system pres-
sure sensor)

—

[Ignition switch: ON]

5V

92

Ground

R

Sensor ground
(ASCD steering switch)

—

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

0V

93

Ground

Y

Ignition switch

Input

[Ignition switch: OFF]

0V

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

94

—

V/W

Engine speed signal output

Output

—

—

95

Ground

Y

Fuel tank temperature sen-
sor

Input

[Engine is running]

0 - 4.8V
Output voltage varies with fuel 
tank temperature.

96

Ground

GR

Sensor ground
(EVAP control system pres-
sure sensor)

—

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

0V

97

—

P

CAN communication line

Input/

Output

—

—

98

—

L

CAN communication line

Input/

Output

—

—

100

Ground

G

Sensor ground
(Accelerator pedal position 
sensor 2)

—

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

0V

102

Ground

R/B

PNP switch

Input

[Ignition switch: ON]
• Shift lever: P or N (CVT), 

Neutral (M/T)

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch: ON]
• Shift lever: Except above

0V

104

Ground

P

Sensor ground
(Fuel tank temperature sen-
sor)

—

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

0V

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

 

 

 

 

 

 

 

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