International VT 365 Service Manual page 49

Figure 37 Magnetic pickups
Magnetic pickup sensors
• CKP
• CMP
• VSS
A magnetic pickup sensor generates an alternating
frequency that indicates rotational speed. Magnetic
pickup sensors have a two wire connection for signal
and ground. The sensor has a permanent magnet
core surrounded by a wire coil. The signal frequency
is generated by the rotation of gear teeth that disturb
the magnetic field.
Crankshaft Position (CKP) sensor
The CKP sensor indicates crankshaft speed and
position.
The CKP sensor provides the ECM with a signal
that indicates crankshaft speed and position. As the
crankshaft turns the CKP sensor detects a 60 tooth
timing disk on the crankshaft. Teeth 59 and 60 are
missing. By comparing the CKP signal with the CMP
signal, the ECM calculates engine rpm and timing
requirements.
The CKP is installed in the front right side of the lower
crankcase.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
ENGINE SYSTEMS
Camshaft Position (CMP)
The CMP sensor indicates camshaft speed and
position.
The CMP sensor sends a pulsed signal to the ECM
when a single peg on the camshaft rotates past
the CMP sensor once during each revolution of the
camshaft. The ECM calculates camshaft speed and
position from CMP signal frequency.
The CMP sensor is installed in the front left side of the
crankcase.
Vehicle Speed Sensor (VSS)
The VSS provides the ECM with transmission tail shaft
speed by sensing the rotation of a 16 tooth gear on
the rear of the transmission. The detected sine wave
signal (AC), received by the ECM, is used with tire size
and axle ratio to calculate vehicle speed.
The VSS is installed in left side of the transmission.
Figure 38 Potentiometer
Potentiometers
•
EGES295-2
Follow all warnings, cautions, and notes.
© 2006 International Truck and Engine Corporation
APS
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