B4000 SE Cab Plus 4 4WD V6-4.0L OHV (2000)
Clutch Switch: Description and Operation
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Input to the PCM indicating the clutch pedal position and, in some manual transmission applications, both the clutch pedal engagement position
and the gear shift position.
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The PCM provides a 5-volt reference (VREF) signal to the CPP switch and/or a park/neutral position (PNP) switch (on the CPP signal line).
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If the CPP switch (either or both CPP and PNP switches are closed) is closed indicating the clutch pedal is engaged and the shift lever is in the
NEUTRAL position, the output voltage (5 volts) from the PCM is grounded through the signal return line to the PCM, and there is one volt or
less. One volt or less indicates there is a reduced load on the engine.
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It the CPP switch (or PNP switch on vehicle or both CPP and PNP switches open on the vehicle) is open, meaning the clutch pedal is
disengaged (all systems) and the shift lever is not in NEUTRAL position (PNP switch systems), 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.
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The PCM uses the load information in mass air flow and fuel calculations.
