The Clutch Pedal Position (CPP) is a normally closed switch. The Transmission Control Module (TCM) or Powertrain Control Module (PCM) detects an ignition voltage in the CPP circuit.
When the clutch pedal is depressed or the clutch switch is open, the control module detects 0 volts in the circuit. When the clutch switch closes, the clutch is released and the control module senses a preset voltage signal and then sends information in series to the Engine Control Module (ECM).
The DTC code P0704 OBD2 is stored when the signal from the CPP switch is not received by the control module. This code determines if the CPP switch has failed to seek a clutch switch transition during a predetermined drive cycle.