Clutch Pedal Position Switch
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
The clutch pedal position (CPP) switch (Fig 1) is an input to the PCM indicating the clutch pedal position. The PCM provides a 5-volt reference (VREF) signal to the CPP switch. If the CPP switch is closed, indicating the clutch pedal is engaged, the output voltage (5 volts) from the PCM is grounded through the signal return line to the PCM, and there is 1 volt or less. One volt or less indicates there is a reduced load on the engine. If the CPP switch is open, meaning the clutch pedal is disengaged, the input on the CPP signal to the PCM will be approximately 5 volts. Then, the 5-volt signal input at the PCM will indicate a load on the engine. The PCM uses the load information in mass air flow and fuel calculations.