What is the Injector Control Pressure Sensor all about?
In a fuel injection system, it’s important that the computer has information concerning the amount of fuel pressure in the rail at all times. This information is necessary for the computer to determine the actual injector timing, the width of each pulse, and the pressure required during operation.
In some diesel engines (notably many Ford engines), this job is done by the injector control pressure sensor, or ICP. The sensor works on the basis of capacitance, and feeds an analog voltage signal to the vehicle’s computer that tells it how much pressure is in the rail.
Like all other sensors, the injector control pressure sensor is subject to wear and tear and eventual failure through normal use. If it fails, the computer will be unable to determine the pressure in the rail, which will adversely affect the operation of the engine.
Keep in mind:
- The injector control pressure sensor is not inspected during normal maintenance.
- The sensor can fail due to wiring problems, sensor deterioration, degradation, and other causes.
- The sensor is part of the fuel system. Do not attempt to work on this yourself.
How it's done:
- The vehicle is lifted and supported on jack stands
- The defective injector control pressure sensor is removed
- The new injector control pressure sensor is installed
- The new sensor is checked for proper operation and jack stands removed
- The engine is run and vehicle is road tested for proper operation
Without an operational ICP, your vehicle’s computer will be unable to operate the fuel injection system correctly. This can result in a number of problems, ranging from lean or rich operation to the Check Engine light turning on. Have a faulty sensor inspected immediately.
What common symptoms indicate you may need to replace the Injector Control Pressure Sensor?
- Engine stutters or stumbles
- Check Engine light is on
- Engine has a rough idle
How important is this service?
It is absolutely essential for your vehicle’s computer to be able to determine the pressure in the rail at all times. If the ICP fails or is failing, expect erroneous engine operation, rough idling, and the Check Engine light to turn on. Have this issue diagnosed immediately. Remember – fuel system work is never something that should be undertaken on your own. Always leave it to our expert mechanics with the proper work area, experience and safety equipment.