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Magnetic Pick-Up Sensors
• The Camshaft Position (CMP)
sensor and Crankshaft Position
(CKP) sensor are both magnetic
pick-up type sensors. Each sensor
contains a permanent magnet core
surrounded by a coil of wire. The
sensor generates a signal through
the collapse of a magnetic field
created by a moving metal trigger.
Movement of the trigger induces an
Alternating Current (AC) voltage in
the sensor coil.
Camshaft Position
(CMP) Sensor
• The CMP sensor is mounted on the
left front of the crankcase. The
CMP sensor reacts to a single peg
pressed into the camshaft. The peg
passes the sensor once per
camshaft revolution producing an
AC signal in the coil.
RIGHT BANK INJECTORS
LEFT BANK INJECTORS
CKP (+) X1-1
CKP (-) X1-2
X1
X1
CMP (+) X1-9
X2
X2
CMP (-) X1-10
X3
X3
CKPO X1-19
X4
X4
CMPO X1-24
ECM
+
1
2
-
CAMSHAFT
POSITION
SENSOR
• The ECM uses the AC signal to
determine the position of the
camshaft. The ECM converts the
AC signal to a square wave output.
The
output
Position Output (CMPO), is sent to
the IDM for fueling calculations.
The ECM conditions the CMP
signal and sends it out as the TACH
signal for body builder use.
Crankshaft Position
(CKP) Sensor
• The CKP sensor is mounted on the
right front of the lower crankcase.
The CKP sensor reacts to a sixty-
minus-two tooth trigger wheel
affixed to the front of the crankshaft.
The sensor produces pulses for
each of the 58 teeth as they pass
the magnet. The two tooth gap
allows the ECM to calculate the
position of the crankshaft.
International
®
ELECTRONIC CONTROL SYSTEM
+
1
2
-
• The ECM uses the CKP signal to
determine the position and speed
of the crankshaft. The ECM
converts the AC signal to a square
signal,
Camshaft
wave output, Crankshaft Position
Output (CKPO), and sends it to the
IDM for fueling calculations.
• The ECM needs both the CKP and
CMP signals to calculate engine
speed and crankshaft position.
From the CKP signal the ECM can
determine
crankshaft and the position of each
piston relative to Top Dead Center.
From the CMP sensor the ECM can
determine the current stroke of
each (i.e., compression or exhaust).
VT 275 V6 Engine
X1
X1
X2
X2
CKPO X3-5
X3
X3
CMPO X3-10
IDM
CRANKSHAFT
POSITION
SENSOR
the
speed
of
the
31
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