Infiniti G37 Coupe. Manual - part 470

AIR CONDITIONING CUT CONTROL

EC-61

< FUNCTION DIAGNOSIS >

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Component Description

INFOID:0000000001733942

1.

ICC steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

DISTANCE switch

6.

MAIN switch

1.

ASCD steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

MAIN switch

1.

Stop lamp switch

2.

ASCD brake switch (ASCD models)
ICC brake switch (ICC models)

3.

Brake pedal

4.

ASCD clutch switch (ASCD models)
ICC clutch switch (ICC models)

5.

Clutch pedal

JMBIA0016ZZ

JMBIA0017ZZ

JMBIA0051ZZ

Component

Reference

Accelerator pedal position sensor

EC-458, "Description"

Camshaft position sensor (PHASE)

EC-268, "Description"

Crankshaft position sensor (POS)

EC-264, "Description"

Engine coolant temperature sensor

EC-184, "Description"

Power steering pressure sensor

EC-346, "Description"

Refrigerant pressure sensor

EC-511, "Description"

Vehicle speed sensor

EC-337, "Description"

EC-62

< FUNCTION DIAGNOSIS >

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

System Diagram

INFOID:0000000001733943

System Description

INFOID:0000000001733944

INPUT/OUTPUT SIGNAL CHART

*: This signal is sent to the ECM through 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.
Operation status of ASCD is indicated by CRUISE lamp and SET lamp in combination meter. If any malfunc-
tion occurs in ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.

SET OPERATION

Press MAIN switch. (The CRUISE lamp in combination meter illuminates.)
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 lamp in combination meter illuminates.)

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 keep the new set speed.

CANCEL OPERATION

JMBIA0074GB

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 clutch switch (M/T models)

Clutch pedal operation

ASCD steering switch

ASCD steering switch operation

Park/neutral position (PNP) switch

Gear position

Unified meter and A/C amp.

Vehicle speed*

TCM (A/T models)

Powertrain revolution*

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-63

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When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
• Brake pedal is depressed
• Clutch pedal is depressed or gear position is changed to neutral position. (M/T models)
• Selector lever is changed to N, P, R position (A/T models)
• 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 indicator lamp.
• 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 lamp will blink quickly.
If MAIN switch is turned to OFF during 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 keep the new set speed.

RESUME OPERATION

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

EC-64

< FUNCTION DIAGNOSIS >

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Component Parts Location

INFOID:0000000001910705

1.

Battery current sensor

2.

IPDM E/R

3.

VVEL control module

4.

Cooling fan relay

5.

VVEL actuator motor relay

6.

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

7.

Refrigerant pressure sensor

8.

Camshaft position sensor (PHASE) 
(bank 1)

9.

Cooling fan motor-2

10. Intake valve timing control solenoid 

valve (bank 1)

11.

Cooling fan control module

12. Cooling fan motor-1

13. Intake valve timing control solenoid 

valve (bank 2)

14. Camshaft position sensor (PHASE) 

(bank 2)

15. Mass air flow sensor (with intake air 

temperature sensor) (bank 2)

16. ICC brake hold relay (ICC models)

17. Brake booster pressure sensor

18. Ignition coil (with power transistor) 

and spark plug (bank 2)

19. Electric throttle control actuator 

(bank 2)

20. A/F sensor 1 (bank 2)

21. Fuel injector (bank 2)

22. VVEL control shaft position sensor 

(bank 2)

23. VVEL actuator motor (bank 2)

24. Manifold absolute pressure (MAP) 

sensor

25. Engine coolant temperature sensor

26. Knock sensor

27. Fuel injector (bank 1)

28. VVEL actuator motor (bank 1)

29. EVAP canister purge volume control 

solenoid valve

30. VVEL control shaft position sensor 

(bank 1)

JMBIA0837ZZ