Briggs & Stratton BIG BLOCK EFI, Руководство по ремонту

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52 Section 2: Troubleshooting DTCs
Modes of Operation
The CKP sensor works in conjunction with
the 23X reluctor target wheel on the fl ywheel.
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 fi eld
produced by an internal sensor magnet. The
CKP sensor internal circuitry detects this inter-
ruption, 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, im-
proper mating, broken locks, improperly
formed or damaged terminals, and poor
terminal to wire connection.
Always clear DTCs after performing repairs.
DTC P0336/P0337 Crankshaft Position (CKP) Sensor
Signal Voltage Noisy or Absent
2
1
CKP
Low
CKP
High
Twisted
Cable Pair
Inline
Connector
23X
FLYWHEEL
J2 04 J2 13
ECM
CKP Sensor
BLACK/WHITE GREEN/WHITE
BLACK/WHITE GREEN/WHITE