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Operation
Inside an APPS
Item
1
Throttle pedal lever
2
APPS wiper arm
The main reason for using the ETC system is to improve driveability.
•
Based on vehicle speed, throttle response to accelerator pedal movement is adjusted by the PCM.
– When the driver presses the accelerator pedal, three Accelerator Pedal Position Sensors (APPS) measure
pedal movement and provide an output voltage to the PCM.
– Multiple APPS are built into the system as a safety feature.
– The throttle pedal has two return springs to ensure that the accelerator pedal is always returned to the ''zero''
position when released.
– Smallest closed pedal position (APPS_RATCH) is continuously learned for each sensor.
– Pulling up on the accelerator pedal with the ignition on causes the PCM to learn a low pedal ratch value. The
PCM detects a small amount of pedal travel in the at rest position but no failure mode will occur.
2004 Explorer/Mountaineer New Model Technician Training
Description
LESSON 3: POWERTRAIN
Item
3
Throttle return springs
4
APPS 1-3 and ground
12-AUG-03
Description
3-21
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