INSTALLATION
CAUTION: Do not attempt to separate or remove the Accelerator Pedal Position Sensor (APPS) from the
accelerator pedal assembly. The APPS is replaced as an assembly along with the pedal. If sensor is
removed from pedal, its electronic calibration may be destroyed.
1. Position pedal and APPS assembly to its mounting
bracket.
2. Connect 6–way electrical connector to top of APPS
(2).
3. Install APPS lower mounting bolt (4) and two
mounting nuts.
4. If necessary, use a Scan Tool to erase any Diag-
nostic Trouble Codes (DTC’s).
SENSOR-CAMSHAFT POSITION
DESCRIPTION
The Camshaft Position Sensor (CMP) on the 5.9L diesel engine is located below the fuel injection pump. It is bolted
to the back of the timing gear housing.
OPERATION
The diesel Camshaft Position Sensor (CMP) contains
a hall effect device. A rotating target wheel (tone-
wheel) for the CMP is located on the camshaft gear.
This hall effect device detects notches located on the
back side of the camshaft gear. As the camshaft gear
rotates, the notches pass the tip of the CMP.
When the leading edge of the notch passes the tip of
the CMP, the following occurs: The interruption of
magnetic field causes the voltage to switch high
resulting in a signal of approximately 5 volts.
When the trailing edge of the notch passes the tip of
the CMP, the following occurs: The change of the
magnetic field causes the signal voltage to switch low
to 0 volts.
The CMP (1) provides a signal to the Engine Control
Module (ECM) at all times when the engine is running.
The ECM uses the CMP information primarily on
engine start-up. Once the engine is running, the ECM
uses the CMP as a backup sensor for engine speed.
The Crankshaft Position Sensor (CKP) is the primary
engine speed indicator for the engine after the engine
is running.
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FUEL INJECTION - DIESEL
DR/DH