Dodge Ram Truck 1500-2500-3500. Manual — part 1464
SENSOR-ACCELERATOR PEDAL POSITION
DESCRIPTION
The Accelerator Pedal Position Sensor (APPS) (1) is
located inside the vehicle. It is attached to the accel-
erator pedal assembly (3). It is used only on 5.7L V-8
gas engines and diesel engines.
OPERATION
The Accelerator Pedal Position Sensor (APPS) provides the Powertrain Control Module (PCM) with two DC voltage
signals which change as the position of the accelerator pedal changes. One of the DC voltage signals will be half
the voltage of the other signal.
REMOVAL
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. Disconnect 6–way electrical connector at top of
APPS (2).
2. Remove APPS lower mounting bolt (4) and two
mounting nuts.
3. Remove pedal and APPS assembly from vehicle.
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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-CRANKSHAFT POSITION
DESCRIPTION
3.7L V-6
The Crankshaft Position (CKP) (2) sensor is mounted
into the right rear side of the cylinder block. It is posi-
tioned and bolted into a machined hole.
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4.7L V-8
The Crankshaft Position (CKP) (1) sensor is mounted
into the right rear side of the cylinder block. It is posi-
tioned and bolted into a machined hole.
5.7L V-8
The Crankshaft Position (CKP) (4) sensor is mounted
into the right rear side of the cylinder block. It is posi-
tioned and bolted into a machined hole.
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OPERATION
3.7L V-6
Engine speed and crankshaft position are provided
through the CKP (Crankshaft Position) sensor. The
sensor generates pulses that are the input sent to the
Powertrain Control Module (PCM). The PCM interprets
the sensor input to determine the crankshaft position.
The PCM then uses this position, along with other
inputs, to determine injector sequence and ignition
timing.
The sensor is a hall effect device combined with an
internal magnet. It is also sensitive to steel within a
certain distance from it.
A tonewheel (targetwheel) (1) is bolted to the engine
crankshaft. This tonewheel has sets of notches (2) at
its outer edge.
The notches cause a pulse to be generated when they
pass under the sensor. The pulses are the input to the
PCM.
4.7L V-8
Engine speed and crankshaft position are provided
through the CKP (Crankshaft Position) sensor. The
sensor generates pulses that are the input sent to the
Powertrain Control Module (PCM). The PCM interprets
the sensor input to determine the crankshaft position.
The PCM then uses this position, along with other
inputs, to determine injector sequence and ignition
timing.
The sensor is a hall effect device combined with an
internal magnet. It is also sensitive to steel within a
certain distance from it.
A tonewheel (1) is bolted to the engine crankshaft.
This tonewheel has sets of notches (2) at its outer
edge.
The notches cause a pulse to be generated when they
pass under the sensor. The pulses are the input to the
PCM.
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FUEL INJECTION - GAS
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