Circuit Description

WARNING: This page is about a different car, the 1997 GMC Pickup and 1997 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Crankshaft Position (CKP) sensor sends a reference signal to VCM indicating crankshaft position and RPM. Information is used to determine when to pulse ignition coil, fuel injectors and control ignition timing.

DTC will set when the following conditions are present:

MAF sensor is at least 5 gm/s.
Change in calculated engine speed is at least 1000 RPM.