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ICP (Injection Control
Pressure)
• The ICP sensor is a three (3) wire
variable capacitance sensor.
• The PCM supplies a 5 volt
reference signal which the ICP
sensor uses to produce a linear
analog voltage that indicates
pressure.
• The primary function of the ICP
sensor is to provide a feedback
signal to the PCM indicating ICP.
• The PCM monitors ICP as the
engine is operating to modulate the
IPR. This is a closed loop function
which means the PCM continuously
E L E C T R I C A L C O M P O N E N T S
monitors and adjusts for ideal ICP
determined by conditions such as
load, speed, and temperature.
• The PCM monitors the ICP signal to
determine if the performance of the
hydraulic system is satisfactory.
• During engine operation, if the PCM
recognizes that the ICP signal is
lower or higher than the value the
IPR is trying to achieve the PCM
will set a Diagnostic Trouble Code
(DTC) and illuminate the amber
malfunction indicator lamp on the
dash.
• The ICP signal from the PCM is one
of the signals the FICM uses to
command the correct injection
timing.
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