Crankshaft Position Sensor - Cannondale 5002401 Service Manual

2. Compare the value with a reading taken manually
in the vicinity of the air temperature tip. If the two
values do not correspond closely, the sensor may
be damaged.
Static Test - Resistance
1. Remove the sensor from the airbox by placing an
open-end wrench on the sensor body and turning
it counter-clockwise until it can be removed.
2. Measure the sensor resistance between terminals
1 and 2. Refer to "Air Temperature Sensor Resis-
tance Range" starting on page 52.
If the measured resistance is inconsistent at the
tested temperature, replace the sensor.
If the measured resistance closely matches the
table values, the sensor is OK, the sensor har-
ness wiring or the ECU itself may be damaged.
Take corrective action.

CRANKSHAFT POSITION SENSOR

The flywheel cover has been removed for this photo to show the
sensor tip.

1. Crankshaft position sensor

2. Sensor tip
3. Flywheel tooth
4. Gap
SERVICE: Crankshaft position sensor gap
0.02 - 0.03 in (0.5 -1.0 mm)
The crankshaft position sensor is located in the
generator housing.
This sensor detects movement of a toothed wheel
that is molded into the flywheel and attached to the
right side of the crankshaft. The wheel has a 36-tooth
pattern. The flywheel teeth are evenly spaced with
the exception of one, triple-length tooth next to one,
triple-length gap. Everytime this tooth/gap passes the
sensor, the ECU interprets it as bottom dead center
(BDC). The ECU uses this information to determine
engine speed and crankshaft position in relation to
the point where fuel is injected and ignition of the air/
fuel mixture occurs.
If the crankshaft position sensor malfunctions, the
engine will not start. If the sensor tip is contaminated
with metallic debris, oils and dirt, or incorrectly
gapped, the engine can run erratically.
If the flywheel is damaged, the sensor may be ok,
but may be reading bad information due to the
resulting change in the indexing between the crank-
shaft and flywheel teeth. Refer to "Flywheel" starting
on page 58.
NOTE :
Metallic debris or other contaminants on the
sensor tip will affect the sensor.
Inspection points
1. Ensure sensor connection to harness is secure.
2. Check sensor gap: 0.5mm-1.0mm.
3. Check for magnetic debris on sensor tip.
4. Check for damaged flywheel teeth.
5. Check flywheel for run-out or play.
6. Check flywheel hub for cracking or separation.
Dynamic Test - ECU Monitor
1. Use the ECU monitor window to confirm change
in reported engine rpm.
With the engine off, there should be no reading
displayed at engine rpm field.
Crank the engine over and a reading should be
displayed. If no change is observed, the sensor or
harness circuit is faulty. Take corrective action.
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