Possible Causes

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Good Trip Equal To Zero
CMP Wiring Harness Inspection
(K6) 5-Volt Supply Circuit Open Or Shorted To Ground
Tone Wheel/Pulse Ring Inspection
Checking CKP Signal With The DRBIII® Lab Scope Probe
Camshaft Position Sensor
(K44) CMP Signal Circuit Shorted To Battery Voltage
(K44) CMP Signal Circuit Open
(K44) CMP Signal Circuit Short To Ground
(K44) CMP Signal Circuit Short To (K6) 5 Volt Supply Circuit
PCM