Failure Conditions
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.
- EST pulses are seen by ECM before by-pass circuit is turned on (5 volts).
- EST signal remains grounded after by-pass circuit is turned on (5 volts).