Code P033, Extended Travel Brake Switch Input Circuit Problem: Action
WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
PCM disables cruise control and substitutes status of TCC contacts of TCC brake switch input for the extended travel input. PCM turns on SERVICE VEHICLE SOON light message.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- PCM input PI86 should cycle from high to low when brake pedal is depressed and then released. If PI86 remains low, check for open or short to ground in system. If PI86 remains high, check for short to voltage in system.
- If 10 volts or greater is measured, check circuit No. 847 or TCC brake switch for open circuit. If less than 10 volts is measured, check circuits No. 341 and 847 for a short to ground.