Nissan Altima L32. Manual - part 238

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-73

< FUNCTION DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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1.

Thermostat housing

2.

Tumble control valve actuator

3.

Throttle valve
(This illustration is view with intake 
air duct removed.)

4.

Electric throttle control actuator

5.

Fuel injector harness connector

6.

Condenser-2

7.

Radiator hose (upper)

8.

Battery

9.

ECM

10. Fuel level sensor unit and fuel pump 

harness connector
(This illustration is view with rear 
seat cushion and inspection hole 
cover removed.)

11. Fuel level sensor unit and fuel pump 

assembly

12. Fuel pressure regulator

13. Fuel tank temperature sensor

14. EVAP control system pressure sen-

sor (This illustration is view with rear 
suspension member removed.)

15. EVAP canister vent control valve

(This illustration is view with rear 
suspension member removed.)

16. EVAP canister

(This illustration is view with rear 
suspension member removed.)
: Vehicle front

ALBIA0093ZZ

EC-74

< FUNCTION DIAGNOSIS >

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Component Description

INFOID:0000000004349162

1.

No.1 ignition coil

2.

Cooling fan motor-1 harness con-
nector

3.

Cooling fan motor-2 harness con-
nector

4.

Refrigerant pressure sensor

5.

Accelerator pedal position sensor

6.

ASCD brake switch

7.

Stop lamp switch

8.

Brake pedal

9.

ASCD clutch switch

10. Clutch pedal

11. ASCD steering switch

12. CANSEC switch

13. RESUME/ACCELERATE switch

14. SET/COAST switch

15. MAIN switch

: Vehicle front

ALBIA0089ZZ

Component

Reference

ASCD steering switch

EC-391, "Description"

ASCD clutch switch

EC-394, "Description"

ASCD brake switch

EC-394, "Description"

Stop lamp switch

EC-406, "Description"

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-75

< FUNCTION DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

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M

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EC

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Electric throttle control actuator

EC-425, "Description"

ASCD indicator

EC-455, "Description"

Component

Reference

EC-76

< FUNCTION DIAGNOSIS >

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CAN COMMUNICATION

CAN COMMUNICATION

System Description

INFOID:0000000004349163

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

Refer to 

LAN-25, "CAN Communication Signal Chart"

, about CAN communication for detail.