Question About Apps

backwoodsbubba8

backwoodsbubba8

know it all
Joined
Jan 4, 2009
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how would i go about checking the voltage on my apps sensor (TPS) TO determined wether or not its bad? thank you for any help!
 
DEAD PEDAL

This is THE MOST COMMON DRIVABILITY COMPLAINT and is an intermittent one that happens most often when the truck is hot or working harder, but can occur much less frequently when cold too. There are no codes pertaining to “Dead Pedal” that will condemn the computer and therefore the VP44.

This symptom of “Dead Pedal” is rarely caused by a faulty APPS (Accelerator Pedal Position Sensor) and 99% of the time it is caused by a faulty computer on the top of VP44 injection pump. These numbers are NOT an exaggeration. The easiest way to positively eliminate or condemn the APPS as the cause of the problem is to “scan" or read the ECM (not the PCM) in your truck to check for any DTC codes pertaining to the APPS, such as a 121 or 122. IF YOU DON’T HAVE EITHER OR BOTH OF THESE CODES, THEN YOU PROBABLY DON’T NEED AN APPS.

Diagnosing a bad APPS accurately without reading or having codes can be done with a voltmeter, by monitoring and measuring the voltage on the blue wire with a black tracer coming from the APPS plug. Turn the ignition key to the on position and slowly press on the throttle and slowly release it. You should not ever see a jump in voltage. It should go up and down smoothly. If it jumps up or down, then replace the APPS.
 
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