Nissan Quest E52. Manual - part 461

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SYSTEM

CAN COMMUNICATION

CAN COMMUNICATION : System Description

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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-32, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart"

, about CAN com-

munication for detail.

STARTER MOTOR DRIVE CONTROL

1.

Power valve actuator 1

2.

VIAS control solenoid valve 1

3.

VIAS control solenoid valve 2

4.

Power valve actuator 2

5.

Intake manifold collector

JMBIA0172ZZ

SYSTEM

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STARTER MOTOR DRIVE CONTROL : System Diagram

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STARTER MOTOR DRIVE CONTROL : System Description

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INPUT/OUTPUT SIGNAL CHART

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

When rapid deceleration occurs during engine runs or idle speed decreases due to heavy load conditions,
ECM detects a decrease in idle speed and restarts the engine to secure reliability in handleability by transmit-
ting a cranking request signal to IPDM E/R for activating the starter motor under the following conditions:
• Selector lever: P or any position other than N
• Idle switch: ON (Accelerator pedal not depressed)
• Stop lamp switch: ON (Brake pedal depressed)
Models with no Intelligent Key System transmit a control signal directly to IPDM E/R. On the other hand, mod-
els with the Intelligent Key System transmit a control signal to IPDM E/R by way of BCM via CAN communica-
tion.
IPDM E/R detects an operating state of the starter motor relay and the starter motor control relay and trans-
mits a feed back signal to ECM via CAN Communication.

JPBIA4762GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)

Engine speed

*1

Piston position

Starter motor drive control

• BCM
• IPDM E/R

(Starter relay & starter control relay)

Camshaft position sensor (PHASE)

Engine coolant temperature sensor

Engine coolant temperature

Accelerator pedal position sensor

Accelerator pedal position

Transmission range switch

Gear position

Stop lamp switch

Brake pedal position

Combination meter

Vehicle speed signal

*2

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OPERATION

OPERATION

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

AUTOMATIC SPEED CONTROL DEVICE (ASCD) : Switch Name and Function

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SWITCHES AND INDICATORS

SET SPEED RANGE

ASCD system can be set the following vehicle speed.

SWITCH OPERATION

CANCEL CONDITION

• When any of following conditions exist, the cruise operation is canceled.
- CANCEL switch is pressed
- ASCD MAIN switch pressed (Set speed is cleared)
- More than two switches at ASCD steering switch are pressed at the same time (Set speed is 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 cancels the cruise operation and informs

the driver by blinking CRUISE indicator lamp.

- Engine coolant temperature is slightly higher than the normal operating temperature. Then CRUISE indica-

tor lamp is blinked slowly.
NOTE:
 Engine coolant temperature decreases to the normal operating temperature, CRUISE indicator lamp stop
blinking and the cruise operation is able to work.

- Malfunction for some self-diagnoses regarding ASCD system. SET indicator lamp is blinked quickly.

1.

CRUISE indicator

2.

CANCEL switch

3.

ASCD MAIN switch

4.

SET / - switch
(SET/COAST)

5.

RES / + switch
(RESUME/ACCELERATE)

A.

On the combination meter

B.

On the steering wheel

JSBIA1368ZZ

Minimum speed (Approx.)

Maximum speed (Approx.)

40 km/h (25 MPH)

144 km/h (89 MPH)

Item

Function

CANCEL switch

Cancels the cruise control driving. 

RES / + switch
(RESUME/ACCELERATE)

• Resumes the set speed.
• Increases speed incrementally during cruise control driving.

SET / 

−

 switch

(SET/COAST)

• Sets desired cruise speed.
• Decreases speed incrementally during cruise control driving.

ASCD MAIN switch

Master switch to activate the ASCD system.

OPERATION

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• When ASCD MAIN switch is turned to OFF during the cruise control driving, all of ASCD operations is can-

celed and vehicle speed memory is erased.