When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So still debugging DTC P1221 TP Sensor 1, 2 Performance. I'm at this step
I disconnected the APP connector here which was the left connector of the TAC module
FSM asks if 'all 3 parameters are 0%' and tech2win says
My question is just whether these APP Sensor 1 Angle parameters are the correct 3 parameters I should be checking?
And since they are 0% looks like next step is for me to disconnect the right connector from the TAC, and backprobe for continuity! Thanks for the sanity check, guys!
What year is your car ??...my FSM shows something different for a P1221 in Step 5. Did you try graphing your TPS 1 and 2 voltages with your Tech2win ??...key on and pushing the gas pedal down while observing the voltages ??...I'd be looking for any drop outs in the voltage...scan tool is good but scope is the best !!...my FSM doesn't mention anything about checking APP..just TPS !!
However I will say that scan tool already indicates Yes, TP sensors Disagree here so I skipped to Step 5! (DTC P1518 is NOT set!)
(For clarity, on tech2win I saw 'TP sensors Disagree.............YES')
I hate using the FSM !!...TPS 1 voltage increases as the pedal is depressed and TPS 2 decreases...if they disagree by a certain percentage the DTC sets...I would be checking the 5 volt ref, the signal, and the grounds on all 6 wires...3 for each TPS potentiometer !!
Can you recommend a backprobing kit you use, say the little metal insert and / or the voltmeter thanks! Otherwise I do know there's a lot of google hits too! I just know our corvette connectors sure look tight to back probe into!
If you have a voltmeter you can use T Pins...you can get them on Amazon or at a craft store...
I have t pins and backprobes with 4 mm banana jacks...I recommend AES Wave for probes or kits !!
Accelerator Pedal Position Parameters
