The CMP sensor is a variable reluctance sensor supplied with a reference voltage of 5 volts.
If the signal from the CMP sensor fails while the engine is running, the engine continues to run using the signals from the CKP sensor.
If the CMP signal is missing at the next starting operation, it will not be possible to start the engine.
IMRC actuator
The IMT valve controls the position of the swirl plates located in the intake manifold.
For additional information, refer to: Fuel Charging and Controls (303-04A Fuel Charging and Controls - 2.0L Duratec-HE (MI4)/2.3L Duratec-HE (MI4), Description and Operation).
The IMT valve is controlled by a vacuum operated solenoid which is located on top of the coolant outlet connector. The IMT valve is adjusted by the solenoid to the desired settings determined by the PCM.
PCM
The BPP switch is connected to the GEM through the CAN bus.
The BPP switch is closed when de-energized and sends a ground signal to the PCM.
The brake light switch is connected with the PCM through a conventional electrical connector.
The brake light switch is open when de-energized. When the brake light switch is closed, it sends 12 volts to the PCM.
The signals of the BPP switch and the brake light switch are used if the accelerator pedal position (APP) sensor should fail.
In this instance, the PCM compares the signals of the BPP switch and brake light switch.
APP sensor
The APP sensor is a double contact-less inductive sensor.
For safety reasons, the APP sensor consists of two sensors.
If the APP sensor malfunctions when the vehicle is in operation, a diagnostic trouble code (DTC) will be stored in the PCM.
If one of the sensors in the APP sensor should fail, the engine will operate at reduced power.
If both sensors of the APP switch fail, after a single operation of the BPP switch and the brake light switch and then after a plausibility check, the engine is controlled up to a speed of 1200 RPM. The vehicle can be accelerated to a maximum speed of 56 km/h (35 mph).
When the BPP switch and the brake light switch are actuated again, engine speed will drop to idle speed. Once the BPP switch and the brake light switch are de-energized again, engine speed is increased again.
If the vehicle is not fitted with an information and message system, the malfunction indicator lamp (MIL) will be illuminated to indicate a system fault.