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Injection Control Pressure (ICP) Sensor
Courtesy of: Ford Motor Company


SIGNAL FUNCTIONS
The Injection Control Pressure (ICP) sensor is a variable capacitance sensor that when supplied with a 5 volt reference signal from the PCM produces a linear analog voltage signal that indicates pressure.

The ICP sensor's primary function is to provide a feedback signal to indicate injection control pressure to enable the PCM to command the correct injector timing and pulse width and the correct injection control pressure for proper fuel delivery at all speed and load conditions.

FAULT DETECTION MANAGEMENT
If the PCM detects a malfunctioning ICP sensor, the CHECK ENGINE lamp will illuminate.  The PCM will go to open loop control of injection control pressure.  (Operate from an estimated ICP pressure.)

At idle, the NGS tool will display a fixed PID value of 725 PSI for ICPA when a signal fault is present.

After removing connector always check for damaged pins, corrosion, loose terminals, etc.

Connector Checks to Ground (B-)
(Check with Sensor Connector Disconnected and Ignition key off, all accessories off)
Test Points Spec. Comments
A to Grd. < 5 ohms Resistance to chassis ground check with key off, if > than 5 ohms harness is open.
B to Grd. > 1000 ohms Resistance less than 1000 ohms indicates a short to ground.
C to Grd. > 1000 ohms Resistance less than 1000 ohms indicates a short to ground.

Connector Voltage Checks
(Check with Sensor Connector Disconnected and Ignition Key On)
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 volts .5 V Ref. check with key ON, if voltage is not in spec., see V Ref circuit
C to Grd. 0 - .25 volts If greater than .25 volts, signal wire is shorted to V Ref or battery.

Harness Resistance Checks
(Check with breakout box installed on engine harness only)
Test Points Spec. Comments
#91 to A < 5 ohms Resistance from harness connector to 104 pin connector - Signal ground
#90 to B < 5 ohms Resistance from harness connector to 104 pin connector - V Ref
#87 to C < 5 ohms Resistance from harness connector to 104 pin connector - ICP signal

Test Points Operational Voltage Checks
(+) #87 to (-) #91 (Check with breakout box installed in line with the PCM)
Voltage PSI MPA Comments
1.0 v 580 4 Minimum required at engine cranking speed 100 RPM
.88-1.19 v 540-790 3.7-5.5 Normal warm idle voltage signal
1.38-1.53 v 960-1088 6.6-7.5 Normal high idle voltage signal
3.22 v 2520 17.4 Snap accel or full load pressure signal

Circuit Faults: Diagnostic Trouble Code Description
1280 = Signal voltage was less than .039 volts for more than .2 seconds.
1281 = Signal voltage was greater than 4.90 volts for more than .2 seconds.
1212 = Signal above 1.625 volts with engine off.  (1160 psi, 8 MPa)