With a little patience and a hacksaw I cut open the ICP sensor I recently replaced to see why it failed. It is the nature of my business to do these kinds of things and this is what I found.

The external O ring appeared to be OK, although a little hard. I did not see any cracks, cuts or scratches on the O ring or sensor surface that would present a possible leak. Past the sensing port there are two seals. A teflon outer and a flat rubber O ring inner seal that fit in a recessed cavity. The actual sensor is a round disk pressed against these two seals. On the back of the sensor are three electrical connections that go through three holes in the upper metal case. These connections are mated to the three male pins in the connector cavity. When I broke the sensor case apart the entire case was full of oil. This leads me to believe the teflon and flat seals failed to isolate just the sensor to sense the oil pressure and flooded the rest of the sensor case with oil. This in turn changes the electrical signal the PCM was receiving from the ICP and thus set the p2285 code. Pretty straight forward what happened.

Before I installed the new ICP, I sprayed the engine connector real good with Breakerless 2+2 carb cleaner and then dried with an air hose to remove the oil residue. The engine connector was saturated with oil. My ICP install was successful since the P2285 code went away and the surging and hesitation disappeared.

DSMMH

 

Very good feedback.