The 58X reference signal is produced by the crankshaft position (CKP)
sensor. During one crankshaft revolution, 58 crankshaft 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
receives an incorrect number of pulses on the 58X reference circuit, DTC
P0336 will set.
Conditions for Setting the DTC
a.. Engine is running.
b.. Extra or missing pulse is detected between consecutive 58X reference
c.. Above condition is detected in 10 of 100 crankshaft rotations.
Action Taken When the DTC Sets
a.. The PCM will illuminate the malfunction indicator lamp (MIL) after the
second consecutive trip in which the fault is detected.
b.. 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
a.. 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
b.. A history DTC P0336 will clear after 40 consecutive warm-up cycles
have occurred without a fault.
c.. DTC P0336 can be cleared by using the scan tool "Clear Info" function
or by disconnecting the PCM battery feed.
An intermittent may be caused by a poor connection, rubbed-through wire
insulation or a wire broken inside the insulation. Check for:
a.. Poor connection - Inspect the PCM harness and connectors for improper
mating, broken locks, improperly formed or damaged terminals, and poor
b.. Damaged harness - Inspect the wiring harness for damage. If the
harness appears to be OK, disconnect the PCM, turn the ignition on and
observe a voltmeter connected to the 58X reference circuit at the PCM
harness connector while moving connectors and wiring harnesses related to
the ICM. A change in voltage will indicate the location of the fault.
Reviewing the Failure Records vehicle mileage since the diagnostic test last
failed may help determine how often the condition that caused the DTC to be
set occurs. This may assist in diagnosing the condition.
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