ISM500 Barometric Ambient Air Sensor

[Rawze]

- Depends on where the truck-maker installed it. Some are buried inside the engine wiring harness, some out in the front under the bumper, some are in the drivers side or passenger side mirror on some model trucks.

I am thinking it is in the engine wiring harness. maybe buy a replacement and see if you can find the same sensor along the harness somewhere zip-tied up and painted over.

maybe look on quickserv and see if you can see it on the drawing for the ecm wiring harness... or if it shows it in the engine overview diagrams. .. quickserv is free to join.