Crankshaft Speed Sensor, Replacing - BMW 1999-2005 M3 Service Manual

Ignition System
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troubleshooting
Note:
When replacing ignition coils, ensure
that the replacements are from the same
manufacturer with the same part/code
numbers. If individual coils with the
correct specifications are not available,
all coils should be replaced.
Crankshaft speed sensor,
replacing
The crankshaft speed sensor is
mounted in the left rear side of the
cylinder block below the starter. The
sensor reads a toothed pulse wheel
(arrow) mounted to the end of the
crankshaft.
If the Engine Control Module (ECM)
does not receive a signal from the
crankshaft speed sensor during
cranking, the engine will not start.
If the OBD II system misfire detection
protocol detects a catalyst damaging
fault due to a malfunction in crankshaft
speed sensor components, the Check
Engine light (Malfunction Indicator Light
or MIL) will be illuminated.
Note:
If the crankshaft speed sensor pulse
wheel is damaged, the engine will have
to be disassembled down to the
crankshaft to replace the wheel.
Make certain ignition has been
-
turned off.
Basic
principles.
2/25/2009 9:54 PM