Z: Injection Control Pressure (ICP) Sensor
Introduction
Introduction
1997 PCED OBDII-Diesel | SECTION 5C: Pinpoint Tests |
Z: Injection Control Pressure (ICP) Sensor Introduction | Z: Pinpoint Tests |
The injection control pressure (ICP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the powertrain control module (PCM), produces a linear analog voltage signal that indicates pressure.
The ICP sensor's primary function is to provide a feedback signal to indicate rail pressure so that the PCM can command the correct injector timing and pulse width and the correct injection control pressure for proper fuel delivery at all speed and load conditions.
If the PCM detects a malfunctioning ICP sensor the CHECK ENGINE light is illuminated and the PCM will go to open loop control of injection control pressure. (Operate from an estimated injection control pressure.)
After removing connector, check for damaged pins, corrosion, loose terminals, etc.
P1212 = ICP voltage not at expected level
P1280 = ICP circuit out of range low
P1281 = ICP circuit out of range high
P1284 = ICP failure — aborts KOER Cylinder Contribution Self Test
| Pressure (PSI) | Pressure (MPA) | Sensor Voltage |
|---|---|---|
| 0 | 0 | .02v |
| 200 | 1.5 | .4v |
| 400 | 3 | 0.73v |
| 600 | 4 | .96v |
| 800 | 5.5 | 1.2v |
| 1000 | 7 | 1.4v |
| 1200 | 8 | 1.6v |
| 1400 | 9.7 | 1.9v |
| 1600 | 11 | 2.1v |
| 1800 | 12.4 | 2.3v |
| 2000 | 13.8 | 2.6v |
| 2200 | 15.2 | 2.8v |
| 2400 | 16.5 | 3v |
| 2600 | 18 | 3.3v |
| 2800 | 19.3 | 3.5v |
| 3000 | 20.6 | 3.8v |
| Z: Pinpoint Tests |