Technical Training
NP10-V8JLR: AJ133 5.0-Liter DFI V8 Engine 04/14/2009
3-11
Engine Management System
Crankshaft Position Sensor
CRANKSHAFT POSITION SENSOR
The crankshaft position (CKP) sensor is located on the
forward side of the transmission torque converter hous-
ing, in line with the engine flexplate.
The sensor is secured with a single bolt into the flywheel
housing. A reluctor ring is fitted to the outer diameter of
the crankshaft flexplate; the sensor reacts to the gaps in
the reluctor ring to determine engine speed and position
information.
The CKP sensor is an inductive-type sensor which pro-
duces a sinusoidal output voltage signal. This voltage is
induced by the proximity of the moving reluctor ring
gaps, which excite the magnetic flux around the tip of
the sensor when each gap passes.
The output voltage increases in magnitude and fre-
quency with the engine speed and, consequently, with
the speed at which the reluctor ring gaps pass the sensor.
NOTE:
The output is also dependent on the air gap
between the sensor and the teeth (the larger the gap, the
weaker the signal, the lower the output voltage).
DIRECTION OF ROTATION
FLEXPLATE
RELUCTOR
VOLTAGE OUTPUT S IGNAL
NP10V8094
Technical Training
NP10-V8JLR: AJ133 5.0-Liter DFI V8 Engine 04/14/2009
3-13
Engine Management System
Camshaft Position Sensor
CAMSHAFT POSITION SENSOR
The camshaft position (CMP) sensors are magneto-
resistive element (MRE) sensors, which have digital out-
put with zero speed recognition. They show a high signal
if the camshaft position target is directly in front of the
sensor, and low if the camshaft position target is not in
front of the sensor.
There are four common sensors, one per camshaft.
Failure Modes
• Sensor open circuit
• Short circuit to vehicle battery supply or ground
• Mechanical fitting and integrity of the sensor
• Camshaft wheel tolerances/camshaft end float excessive
• Camshaft and crankshaft misalignment/valve timing error
• Camshaft wheel magnetized/residual magnetism
• Speed signal correlation with crankshaft sensor input
• Incorrect air gap between camshaft and sensor
NOTE:
If both the CKP sensor and the CMP sensor fail,
the engine will stall or not start.
Failure Symptoms
• Ignition timing reverting to the base mapping, with no cylinder correction
• VCT is disabled
NP10V8096
NP10V8097
NP10V8098
43.40°43.40°43.40° 91.60°
91.60°
133.40°133.40°
91.60°
133.40°
91.60°
91.60°91.60°
Specification
Function
Pin 1 Supply
Pin 2 Ground
Pin 3 Signal
Operating voltage 4.5 to 7 V
Maximum supply current 22 mA
