ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION — Electronic Ignition (EI) System (Cont'd); Air Conditioning Cut Control; Fuel Cut Control
EF & EC-7020prose procedureElectronic Ignition (EI) System (Cont'd)
CG10, CGA3
e.g., N: 1,800 rpm, Tp: 1.50 msec
A°BTDC
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in the ECM.
- At starting
- During warm-up
- At idle
- During acceleration
Air Conditioning Cut Control
DESCRIPTION — Input/Output Signal Chart
Air Conditioning Cut Control Input/Output Signal Chart
Air conditioner switch
Input Signal to ECMAir conditioner "ON" signal
ECM functionAir conditioner cut control
ActuatorAir conditioner relay
Throttle position sensor
Input Signal to ECMThrottle valve opening angle
ECM function
Actuator
Crankshaft position sensor (POS)
Input Signal to ECMEngine speed
ECM function
Actuator
Engine coolant temperature sensor
Input Signal to ECMEngine coolant temperature
ECM function
Actuator
Ignition switch
Input Signal to ECMStart signal
ECM function
Actuator
Vehicle speed sensor
Input Signal to ECMVehicle speed
ECM function
Actuator
Power steering oil pressure switch
Input Signal to ECMPower steering operation
ECM function
Actuator
System Description
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
- When the accelerator pedal is fully depressed.
- When cranking the engine.
- At high engine speeds.
- When the engine coolant temperature becomes excessively high.
- When operating power steering during low engine speed or low vehicle speed.
- When engine speed is excessively low.
Fuel Cut Control (at no load & high engine speed)
DESCRIPTION — Input/Output Signal Chart
Fuel Cut Control Input/Output Signal Chart
Vehicle speed sensor
Input Signal to ECMVehicle speed
ECM functionFuel cut control
ActuatorInjectors
PNP switch
Input Signal to ECMNeutral position
ECM function
Actuator
Throttle position sensor
Input Signal to ECMThrottle position
ECM function
Actuator
Engine coolant temperature sensor
Input Signal to ECMEngine coolant temperature
ECM function
Actuator
Crankshaft position sensor (POS)
Input Signal to ECMEngine speed
ECM function
Actuator
If the engine speed is above 3,950 rpm with no load, (for example, in Neutral and engine speed over 4,000 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed. Fuel cut will operate until the engine speed reaches 1,150 rpm, then fuel cut is cancelled.
NOTE
This function is different from deceleration control listed under "Multiport Fuel Injection (MFI) System", EC-7019.
See also
EC-7019