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Home >> Pontiac >> 2000 >> Firebird Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1374: Crankshaft Position (CKP) High-To-Low Resolution Frequency Correlation >> Circuit Description

Circuit Description

3X reference circuit is produced by Ignition Control Module (ICM). 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 for setting DTC are: ratio of 18X reference signal pulses to CAM signal pulses received by the PCM equals 36:1, ratio of 18X reference pulses to 3X reference pulses received by the PCM does not equal 6:1, and conditions are present for greater than 10 seconds.

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