Find the upstream O2 sensor. Cut the signal wire and patch the Blue wire to the wire you clipped leading to the O2 and the Grey to the other end that you clipped that would lead to the DME.
When the SIM is off it will connect the clipped wire and your O2 work normally and when the SIM turns on it sends a 200mv signal to the DME tricking it so it thinks the air pump is working |