Diagnostic Aids
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Perform the following in order to avoid misdiagnosis.
- Inspect for proper operation of brake lamps.
- Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
- Inspect for stored diagnostic trouble codes (DTCs) in the powertrain control module (PCM.)
- EMI on the speed sensor signal circuit may cause erratic cruise control operation.