Accelerator Pedal Position Sensor (PWG): Notes
The Accelerator Pedal Position Sensor (PWG) is mounted in the passenger compartment, clipped to a bracket that is bolted to the floor. The PWG is monitored by the EMS2000 for input on pedal position as well as speed of change.
The Accelerator Pedal Position Sensor uses two angle Hall sensors with different voltage characteristics and independent power supplies to provide the drivers input request. The angle Hall sensors receive power (5v) and ground from the EMS2000. The PWG produces linear voltage signals as the pedal is pressed from the LL position (idle) to the VL position (full throttle).
The values for the two internal sensors are:
- Hall Sensor 1 - approximately 0.5 to 4.5 volts Driver Request
- Hall Sensor 2 - approximately 0.5 to 2.0 volts Plausibility Check
The Accelerator Pedal Position (PWG) is monitored by the EMS2000 for pedal angle position and rate of movement. As the accelerator is moved, a rising voltage signal from the Hall sensors requests acceleration and rate. The ECM will increase the volume of fuel injected into the engine, advance the ignition timing and open the Throttle Valve.
The "full throttle" position (VL) indicates maximum acceleration to the ECM, and in addition effects air conditioning compressor activation.
As the accelerator pedal is released and returned to the rest position by integral springs, a decrease in voltage signals the EMS2000 to activate fuel shut off if the RPM is above idle speed (coasting). The Throttle Valve will be closed and will open enough to maintain idle speed.