Nissan Versa Sedan Service ManualEngine » Engine control system (EC)
Automatic speed control device (ASCD)
Automatic speed control device (ASCD)
Automatic speed control device (ascd) : system diagram
NOTE:
Transmission range switch and TCM is also for A/T models.
Automatic speed control device (ascd) : system description
INPUT/OUTPUT SIGNAL CHART
| Sensor | Input signal to ECM | ECM function | Actuator |
| Brake pedal position switch | Brake pedal operation | ASCD vehicle speed control | Electric throttle control actuator |
| Stop lamp switch | |||
| Clutch pedal position switch (M/T models) | Clutch pedal operation | ||
| ASCD steering switch | ASCD steering switch operation | ||
| Transmission range switch (A/T models or CVT models) | PNP signal | ||
| Park/neutral position (PNP) PNP signal switch (M/T models) | |||
| Combination meter | Vehicle speed signal* | ||
| TCM (A/T models or CVT models) | Output shaft revolution signal* |
*: This signal is sent to the ECM via the CAN communication line
BASIC ASCD SYSTEM
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed without depressing accelerator pedal. Driver can be set the vehicle speed in the set speed range.
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated in combination meter.
If any malfunction occurs in the ASCD system, it automatically deactivates the ASCD control.
CAUTION:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.
Alternator power generation voltage variable control system
Alternator power generation voltage variable control system : system description
The alternator power generation voltage variable control system controls the amount of power generation, according to a battery loaded condition. ECM judges a battery condition, according to a signal received from the battery current sensor which detects a charge/discharge current. ECM then transmits a signal to IPDM E/ R to command power generation via CAN communication. IPDM E/R transmits a power generation control signal to the alternator so that the system can control the amount of power generation. The voltage of power generation is lowered during battery lowload conditions and boosted under heavy load conditions. In this way, the system reduces the engine load through the adequate power generation control.