APPS & idle throttle disagree?

thewrightdiesle

thewrightdiesle

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May 21, 2008
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Accelerator Pedal Position Sensor Signal Volts Do Not Agree w/Idle Validation Signal

Any one have any ideas about this? how much is an APPS sensor? what else could it be? im stumped! it says i need to chech voltage to this sensor.. any help were its located and what else it could be???? help PLEASE!!?!?!?!?!?!:owned:
 
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P0121
Accelerator Pedal Position Sensor Signal Volts Do Not Agree w/Idle Validation Signal

How savy are you with a multi meter.
 
it's not supposed to run any more than 5 volts right? but were is it located at? and how much is a new one? is 400 right? what does it hurt to keep on truckin with this code?
 
There's kinda a triangular black plastic cover on the drivers side front of the motor.

Behind it will be the APPS sensor. To reset it follow this proceedure.

Tools: Digital Volt Meter, T-20 Torx bit, #1 phillips, 10mm socket

With the key on, engine off you need to probe the APPS wire to see where the voltage is currently set at.
The best location to probe the wire is on the PCM (Power Control Module) which is located on the passenger firewall behind the air intake.
You want the C1 connector, this is the connector closest to the engine
You want the orange wire with a dark blue tracer which is pin #23 (Please use a suitable backprobing adapter for your meter lead, do not pierce the insulation as this can lead to water intrustion/corrosion.)
Voltage should be somewhere around 0.5 volts,
At this point the voltage reading does not matter, it just has to be accurately written down for later reference

TURN THE IGNITION OFF ON THE TRUCK

Remove the black plastic cover off of your APPS. There are two plastic screws. One on the top and one on the front facing the radiator. It takes a little prying to pull it off.

Undo the 6-10mm bolts that hold the bracketry in place but DO NOT REMOVE THE CABLES!!

You will notice the APPS is on the back of the bracketry that you just removed, it is held in place by 2-T20 torx bit screws. These screws have a little bit of locktite on them so make sure you have a good socket and gently give a little tap with a hammer before attempting to loosen. Be very careful because these screws strip VERY easily and you only get one shot at them (VERY VERY VERY IMPORTANT; They are VERY tight).

On the APPS you will find a white tag that gives you the information on what the APPS voltage should be.
After loosening the screws (do not remove) you can rotate the APPS clockwise or counter clockwise to get the adjustment (towards the front of the truck increases voltage and towards the rear of the truck decreases voltage)
The reading you took at the beginning of the process on pin #23 should match the white tag on your APPS. If it doesn't the adjust accordingly.
 
I adjusted mine today and the throttle held wide open after it, maybe I had it on the wrong setting on the multimeter, which setting should it be on?
 
There is a sticker on the back of the APPS set it to the voltage stamped on it.
 
yeah I know but what setting on the multimeter can I read voltage accurately with?
 
yea i was just thinkin if it was from the 6 foot ditch i put my truck in a few months ago... gonna turn it in on insurance if i can prove that
 
who knows its worth a try i have just had my truck out of the shop for about a week or two and told the insurance about the check engine light they said find out about it so ill try thanks for all your help tho
 
If worse comes to worst, and insurance cuts you a check... I have one I'll sell ya alot cheaper than the dealer.
 
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