Briggs & Stratton VANGUARD M490000, Repair Manual

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DTC P0336/P0337 CRANKSHAFT POSITION (CKP) SENSOR
Modes of Operation
The CKP sensor works in conjunction with the 23X
reluctor target wheel on the flywheel. Each tooth on the
reluctor wheel is equally spaced with 1 tooth missing for
the reference sync pulse. As the crankshaft rotates, the
reluctor target wheel interrupts a magnetic field produced
by an internal sensor magnet. The CKP sensor internal
circuitry detects this interruption, and produces an ON/
OFF AC voltage of varying frequency. The frequency
of the CKP sensor output signal is dependent upon
crankshaft speed. The ECM uses each CKP sensor
output signal to determine crankshaft speed and identify
crankshaft position.
With the spark under control of the ECM, the engine will
not run if the CKP sensor signal is lost. The ECM will not
be able to determine which stroke the pistons are on.
Diagnostic Aids
Check for the following conditions:
1. Verify that the CKP sensor is gapped at
0.030
inches (0.76 mm) from the target wheel.
2. Poor ECM connection. Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
Always clear DTCs after performing repairs.
Not for
Reproduction