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Home >> Chevrolet >> 2000 >> Venture Base, Van Passenger Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1374: Crankshaft Position High-To-Low Resolution Frequency Correlation >> Circuit Description

Circuit Description

3X reference circuit is produced by Ignition Control (IC) module. PCM uses 3X reference signal pulses to calculate engine speed (RPM) and crankshaft position at engine speed greater than 1200 RPM. PCM uses pulses on this circuit to initiate injector pulses. If PCM receives incorrect number of pulses on 3X reference circuit, DTC will set.

Conditions required to set DTC are, engine running and PCM is receiving 24X reference signal pulses, ratio of 24X reference signal pulses to 3X reference signal pulses received by PCM does not equal 8 and ratio of 24X reference signal pulses to camshaft reference signal pulses received by PCM equals 48.

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