Can someone please tell me what the IPR does?, and what the ICP does?. What are the symptoms of each being bad? Thanks and have a great Memorial Day everyone!

 

Injection Control Pressure Sensor
The Injection Control Pressure sensor is a variable capacitor sensor that is supplied a 5-volt reference signal by the PCM and returns a linear analog voltage signal that indicates pressure. The sensor measures the oil pressure in the LH injection rail. PCM uses this information to determine injection control pressure. The Injection Control Pressure sensor along with the Injection Control Pressure Regulator form a closed loop fuel pressure control system. If the PCM detects an inoperative Injection Control Pressure sensor, the PCM will control injection control pressure from a PCM-estimated injection control pressure. If you find oil under the ICP sensor plug it is on its way out. You can test it my disconnecting and seeing if symptoms improve.

Injection Pressure Regulator
The Injection Pressure Regulator controls injection oil pressure. An electrical signal to a solenoid creates a magnetic field which applies a variable force on a valve servo to control pressure. The quantity of fuel delivered to the combustion chamber is proportional to injection control pressure.

An open circuit will result in minimum oil pressure and a no-start situation. A short circuit results in maximum oil pressure, and is limited by a mechanical pop-off valve to4000 psi. If the PCM detects an inoperative Injection Control Pressure sensor, the PCM will control injection control pressure from a PCM-estimated injection control pressure.

 

Nice reply Clay

 

I unplugged ICP on my 2000 7.3 the engine won't start PCM didn't go into default whats going on? Runs rough with it plugged in.

 

Try tspping your IPR and see if it will start then.

Also, check you batteries and the Glow Plug Relay. What are your outside air temps when trying to start?