Infiniti FX35, FX50 (S51). Manual - part 631

AIR CONDITIONING CUT CONTROL

EC-65

< SYSTEM DESCRIPTION >

[VQ35HR]

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Component Description

INFOID:0000000005236709

1.

ICC steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

DISTANCE switch

6.

MAIN switch

7.

LDP/DCA switch

1.

ASCD steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

MAIN switch

1.

Snow mode switch

JSBIA0155ZZ

JSBIA0156ZZ

JMBIA1623ZZ

Component

Reference

Accelerator pedal position sensor

EC-442, "Description"

Camshaft position sensor

EC-273, "Description"

Crankshaft position sensor

EC-268, "Description"

Engine coolant temperature sensor

EC-186, "Description"

Power steering pressure sensor

EC-351, "Description"

Refrigerant pressure sensor

EC-494, "Description"

EC-66

< SYSTEM DESCRIPTION >

[VQ35HR]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

System Diagram

INFOID:0000000005236710

System Description

INFOID:0000000005236711

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM via the CAN communication line

BASIC ASCD SYSTEM

Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
The ASCD operation status is indicated by two indicators (CRUISE and SET on the information display) on the
combination meter. If any malfunction occurs in the ASCD system, SET indicator blinks and ASCD control is
deactivated.
NOTE:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION

Press MAIN switch. (CRUISE is indicator on the information display.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET is indicated on the information display, and the set speed is also
display.)

ACCELERATE OPERATION

If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will maintain the new set speed.

CANCEL OPERATION

When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed

JMBIA1616GB

Sensor

Input signal to ECM

ECM function

Actuator

ASCD brake switch

Brake pedal operation

ASCD vehicle speed control

Electric throttle control 
actuator

Stop lamp switch

Brake pedal operation

ASCD steering switch

ASCD steering switch operation

TCM

Gear position

Powertrain revolution*

Unified meter and A/C amp.

Vehicle speed*

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-67

< SYSTEM DESCRIPTION >

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• More than 2 switches on ASCD steering switch are pressed at the same time (Set speed will be cleared)
• Brake pedal is depressed
• Selector lever position is changed to N, P or R
• Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
• TCS system is operated
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicators.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may

blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.

• Malfunction for some self-diagnoses regarding ASCD control: SET indicator will blink quickly.
If MAIN switch is turned to OFF while ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.

COAST OPERATION

When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will maintain the new set speed.

RESUME OPERATION

When the RESUME/ACCELERATE switch is pressed after canceling operation other than pressing the MAIN
switch, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must meet
following conditions.
• Brake pedal is released
• A/T selector lever is in a position other than P and N
• Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)

EC-68

< SYSTEM DESCRIPTION >

[VQ35HR]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Component Parts Location

INFOID:0000000005568463

1.

IPDM E/R

2.

Battery current sensor

3.

Cooling fan relay

4.

Mass air flow sensor (with intake air 
temperature sensor) (bank 1)

5.

Refrigerant pressure sensor

6.

Cooling fan motor-2

7.

Intake valve timing control solenoid 
valve

8.

Exhaust valve timing control magnet 
retarder

9.

Cooling fan control module

10. Cooling fan motor-1

11.

Mass air flow sensor (with intake air 
temperature sensor) (bank 2)

12. ICC brake hold relay (ICC models)

13. Ignition coil (with power transistor) 

and spark plug (bank 2)

14. Electric throttle control actuator 

(bank 2)

15. A/F sensor 1 (bank 2)

16. Fuel injector (bank 2)

17. Camshaft position sensor

18. Engine coolant temperature sensor

19. Knock sensor

20. Exhaust valve timing control position 

sensor

21. EVAP canister purge volume control 

solenoid valve

22. Fuel injector (bank 1)

23. Ignition coil (with power transistor) 

and spark plug (bank 1)

24. EVAP service port

25. A/F sensor 1 (bank 1)

26. Crankshaft position sensor

27. Electric throttle control actuator 

(bank 1)

JMBIA1496ZZ