Isuzu 1999 RODEO Workshop Manual page 1518

Diagnostic Trouble Code (DTC) P0337 CKP Sensor Circuit Low Frequency
Circuit Description
The 58X reference signal is produced by the crankshaft
position (CKP) sensor. During one crankshaft revolution,
58 crankshaft reference pulses will be produced. The
powertrain control module (PCM) uses the 58X reference
signal to calculate engine RPM and crankshaft position.
The PCM constantly monitors the number of pulses on
the 58X reference circuit and compares them to the
number of camshaft position (CMP) signal pulses being
received. If the PCM does not receive pulses on the 58X
reference circuit, DTC P0337 will set.
Conditions for Setting the DTC
f No camshaft position (CMP) sensor DTCs are set.
f Engine cranking.
f Crankshaft position (CKP) sensor signal is not present
between two cam pulses.
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
f CKP reference pulse is not detected within 8 CMP
pulses.
Action Taken When the DTC Sets
f The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.
f The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
f The PCM will turn the MIL "OFF" on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
f A history DTC P0337 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
6E2–275
D06RX017