Nissan Qashqai (2007-2010). Manual — part 289

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-675

< FUNCTION DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

C

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EC

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

System Diagram

INFOID:0000000000936620

System Description

INFOID:0000000000936621

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 manuals.
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 180 km/h (112 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 180 km/h (112
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

JMBIA0176GB

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

ASCD clutch switch (M/T models)

Clutch pedal operation

ASCD steering switch

ASCD steering switch operation

Park/neutral position (PNP) switch

Gear position

Combination meter*

Vehicle speed

TCM* (CVT models)

Powertrain revolution

EC-676

< FUNCTION DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

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 (CVT 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)
• Selector lever is in other than P and N positions (CVT models)
• Vehicle speed is greater than 40 km/h (25 MPH) and less than 180 km/h (112 MPH)

Component Parts Location

INFOID:0000000001093565

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-677

< FUNCTION DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

C

D

E

F

G

H

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J

K

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EC

N

P

O

1.

Ignition coil (with power transistor)
and spark plug

2.

PCV valve

3.

Refrigerant pressure sensor

4.

Fuel injector

5.

Knock sensor

6.

Cooling fan motor

7.

Camshaft position sensor (PHASE)

8.

Engine coolant temperature sensor

9.

IPDM E/R

10. ECM

11.

Mass air flow sensor (with intake
temperature sensor)

12. Electric throttle control actuator

(with built in throttle position sensor
and throttle control motor)

13. EVAP canister purge volume control

solenoid valve

1.

ECM

2.

IPDM E/R

3.

Fuel pump fuse (15A)

JMBIA0338ZZ

JMBIA0340ZZ

EC-678

< FUNCTION DIAGNOSIS >

[MR20DE (WITH EURO-OBD)]

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

1.

Electric throttle control actuator
(with built-in position sensor, throttle
control motor)

2.

Throttle valve

1.

EVAP canister purge volume control
solenoid valve

2.

Mass air flow sensor
(with intake air temperature sensor)

1.

Camshaft position sensor

2.

Engine coolant temperature sensor

JMBIA0341ZZ

JMBIA0342ZZ

JMBIA0343ZZ