Powertrain Control Module (Pcm)
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The cruise control function is managed by the PCM.
The PCM software continually monitors cruise control inputs as well as electronic vehicle distance message inputs from the ABS module and numerous hard wired inputs including the brake (or stop) lamp switch, then provides the appropriate electronic message and hard wired outputs to invoke the requested electronic cruise control features.
If the PCM detects a fault on one of the following systems, it will disable the cruise control system. The PCM will store an appropriate Diagnostic Trouble Code (DTC).
- Vehicle Speed Sensor
- Sensor or actuators of the electric throttle (only for gasoline engines)
- Accelerator Pedal Position Sensor (APPS)
- Brake Pedal Position
- Clutch Switch rationality
- Engine Load sensor (only for gasoline engines)
- Ignition Coils (only for gasoline engines)
- Fuel Injectors
- High pressure system components (only for GDI and Diesel engines)
- Turbo sensors or actuators.
The PCM monitors all of the cruise control system electrical circuits to determine the system readiness. If the PCM detects a monitored system fault, it sets and stores a DTC. The PCM uses On-Board Diagnostics (OBD) and can communicate with other electronic modules in the vehicle as well as with the diagnostic scan tool using the CAN data bus.
Speed Limiter Function
The Speed Limiter function allows limiting the speed of the vehicle to customer programmable values. The speed limiter button is located on the steering wheel below the speed control buttons. The maximum programmable speed is 30 km/h (19 mph).