Note On Intermittents
WARNING: This page is about a different car, the 1990 Cadillac Fleetwood and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
If an intermittent Code E24 is being set, lift drive wheels and let vehicle idle in low gear. Manipulate the related wiring while observing engine data parameter P.0.9. If failure is induced, vehicle speed reading will drop from its normal value to reading of zero MPH. Check for opens or shorts on circuits No. 400 and 401. Check terminal contact at speed sensor and ECM. If wiring and connectors are okay, substitute a good known sensor and repeat testing procedure.