Z: Injection Control Pressure (ICP) Sensor
Introduction
Introduction
1996 PCED OBDI | SECTION 18: Diesel Diagnosis — 7.3L DI Engine |
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.
| Test Points | Spec. | Comments |
|---|---|---|
| A to Grd | <5 ohms | Resistance to ground check with key off; if greater than 5 ohms, the harness is open |
| B to Grd | >5 ohms | Resistance less than 5 ohms indicates a short to ground |
| C to Grd | >5 ohms | Resistance less than 5 ohms indicates a short to ground |
| Test Points | Spec. | Comments |
|---|---|---|
| A to Grd | 0-.25 volts | If greater than .25 volts, signal wire is shorted to VREF or battery |
| B to Grd | 5.0 ± .5 volt | VREF check with key on |
| C to Grd | 0-.25 volts | Signal; if greater than .25 volts, signal wire is shorted to VREF or battery |
1212 = ICP voltage not at expected level.
1280 = ICP circuit out of range low.
1281 = ICP circuit out of range high.
1284 = ICP failure — aborts KOER Cylinder Contribution Self Test.
| Z: Pinpoint Tests |