F. Deceleration
Fuel
Cut-off
Adjustment
When the system exits the deceleration fuel cut-off control mode, the ignition angle will be
adjusted to make the throttle close transition smooth.
G.. Air-Conditioning
Control
Adjustment
When the engine is idling, turn off the Air-Conditioner. The ignition angle will be adjusted to
make the engine run smoothly.
2.12.3.4 Electronic Throttle Body Function Restrictions
1. Forced Shut Down Mode
When ECM reports a malfunction or that the intake or throttle air flow control has a problem, the
control strategy is to stop the fuel supply and the ignition, and to close the throttle as well as to
shut down the engine.
2. Forced Idle Speed Power Management Mode
When the engine is idling, ETC system can not reliably use the throttle to control engine power. At
this point, the ETC cancels the throttle control. The throttle opening returns to the default position.
The engine power control is achieved by stopping one cylinder fuel injection and delaying the
ignition angle.
3. Forced Idle Speed Mode
When the driver's intention can not be reliably detected, such as that all pedal signals are lost, the
vehicle only maintains cooling, heating, electricity supply and lighting functions with engine
idling. If pressing the acceleration pedal, there is no response on the engine, then in this mode the
vehicle can not be driven.
4. Restricted Power Management Mode
ETC system can not use the throttle to control engine power. In this mode, the system determines
whether the engine is at idle speed or is accelerating based on the acceleration pedal signal. The
system controls engine power output by shutting down the engine, or by stopping a cylinder fuel
injection, or by delaying the ignition. The engine output fluctuation is obvious. Working a long
time in this mode would be harmful to the engine emission system. The model ensures that the
vehicle is barely enough to be driven, but difficult to control in normal traffic or climbing on a
steep slope.
5. Mode when the reliability of determining the drive intention is decreased or when the
system can not achieve high power output
When the two acceleration pedal position sensors input signals have two much difference, the
engine's output torque is limited. The engine's response to the pedal position change is much
slower. The driver may feel that the engine power output will be significantly weakened, but the
vehicle will be still able to drive in normal traffic.
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