Wrapper

[new echo owner]

If the CEL is flashing, it means the ECU is detecting a engine problem which has the potential of damaging the Cat. Pull the code to find out which cylinder is misfiring.

When you check the cables, did you disconnected them from both ends? Engine problem can affect the cruise control operation. Toyota cruise control never have much problem with surging, so the engine running problem might have affected its operation.

N.E.O.