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ElEctrical componEnts
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• The ECM needs both the CKP and CMP signal to
calculate engine position. The CMP creates a signal
that the ECM uses to indicate a particular bank.
• The CMP contains a permanent magnet which creates a
magnetic field, when the magnetic field is broken by the
peg on the camshaft a signal in the form of a sine wave
is created (converted to a square wave by the ECM).
Pressure
Control
Valve
Volume
Control
Valve
Crankshaft Position Sensor
Throttle Body
E
E ngine
Chassis
Turbocharger
Actuator
EGR
Valve
CMP (Camshaft Position)
• The camshaft position signal source is a magnetic pickup
sensor mounted on the left front side of the engine block.
• The sensor reacts to a peg, pressed into the
camshaft at the front of the engine.
• The peg will pass the sensor once per camshaft revolution,
the sensor will produce a single pulse correspondingly.
• Camshaft speed is derived from the frequency of the CMP
sensor signal.
• Diagnostic information on the CMP input signal is obtained by
performing accuracy checks on signal levels and frequency.
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