The APPS is an accelerator pedal position sensor, and is used on
electronically-controlled trucks ('98.5 and up). Older engines (12-valve
head) will have a similar sensor (a TPS, or throttle position sensor), but
this is only for automatic-equipped trucks, and is just there for torque
converter locking/unlocking. Fueling on the 12V engines is mechanically
controlled from the throttle cable, directly to a valve on the injection
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.