The distributor ignition system supplies two timing inputs to the
PCM, a high resolution signal (180 pulses per one crankshaft revolution)
and a low resolution signal (4 pulses per one crankshaft revolution).
The high resolution and low resolution circuits toggle between 0 and 5
volts as the camshaft turns. The PCM can determine if one of the timing
inputs is not being received by comparing the two inputs.
The following malfunctions to the high resolution circuit will cause a DTC P0372 to set:
A short to voltage.
A short to ground.
A defective ignition module within the distributor.
Conditions for Setting the DTC
The PCM detects low resolution pulses but no high resolution pulses.
Action Taken When the DTC Sets
The PCM will illuminate the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
PCM will record operating conditions at the time the diagnostic fails.
This information will be stored in the Freeze Frame and/or Failure
The injector will be disabled for the entire ignition cycle.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
History DTC will clear after forty consecutive warm-up cycles, if no
failures are reported by this or any other emission related diagnostic.
PCM battery voltage is interrupted.
Using a Scan tool.
DTC P1351 and/or DTC P1361 is also set with a DTC P0372, and no
external fault can be found, replace the PCM. If only DTC P0372 is set
and the distributor connections are OK, replace the distributor.
If distributor components must be replaced, check distributor vent system operation.
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