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Drove the car to work on Friday. It ran perfect matter of fact just came back last week from a 1600 mile round trip in it. A great trip. Anyway had a huge storm on Friday afternoon. Didn’t think much about it as my car sees rain regularly during out summer months in SE Florida. Hop in the car and immediately get a reduced power and car sounds really odd. Pull it into the shop. Hook up a scanner shows code 1220 and 1221. Pull the connector on the tps. Looks ok. Looked like water had been in there before on a couple terminals but nothing now. Order a new tps and install it yesterday. Nope. Unplug it check to see if the throttle body plate moves freely. Yep no problem. Suspect tge connection is the problem. Clean the connector plug it in clear codes drive for about a block the threw the same code and reduced code and reduced power. Pulled the right front wheel and removed the pabel fir the ecu and tac module. A little damp in the there but after pulling and inspecting the plugs everything is dry. Plugged it back in. No go. I really suspect the tps plug is the problem. Anyone ever run into this. Have a new pigtail coming. The fact that someone makes one tells me this has been a issue before with other cars. I’m open to any help anyone can offer.
Are you using a scan tool or a code reader ??…can you graph your TPS2 voltage key ON if you have a scan tool ??…if you can’t graph TPS2 try checking voltage with a DVOM…5 volt ref, signal, and low ref (ground)…I’m in SW Florida if you want to bring it by but if it’s in REP it may be difficult…I much prefer using my scope on these TPS voltages since a DVOM can’t see the rapidly changing voltages on them which can set a DTC…if you’re near Melbourne I can recommend a good shop there.
I’m in Naples. I have a scan tool. I will look at the tps voltage. Something got wet I’m sure of it. I can run live data on my scan tool. I have track spec hood vents on the car and I’m the tps got soaked.
You should be able to see the individual TPS voltages with the scan tool…if the PCM sees less than 0.13 volts (WOT) or more than 4.87 volts (idle) on TPS2 the DTC sets…did you remove the TPS connector and with key on check for 5 volts on the reference wire and less than 100mv’s on ref low…if you jump the 5 volt ref to the signal you should see 5 volts on the scan tool…if you need help I can drive out to Naples…these are my TPS 2 voltages idle and WOT key ON.
…what year is the car ??…really helps if your profile is filled out with this info.
Is that the voltage you see or mine that I posted ??…the 5 volt ref is shared between TPS2 and APP2…if you see 5.02 volts your ground may be “elevated”…I’d check the ref. low voltage on TPS2 key on…that would be pin E which is a white wire…check TPS1 and see if you see the same reading on pin B which is the purple wire…should be less than 100mv’s (0.1 volts)…with connector unplugged is where you are seeing 5.02 volts (yellow/black wire)or is that with it connected and back probing the pin ??
I wish you where closer to me. I would love to just turn this over to you. The car is at our shop so I will get the voltage readings in the morning. Sure do appreciate your help.
If you get stuck with the testing I’d be happy to swing by and help out…if you are seeing more than 5 volts on TPS2 check the ref. ground…the TAC module ground is above the starter and that is where the TPS and APP reference grounds go…did you use an aftermarket TPS sensor ??
The only thing is maybe there is a short to ground on the TPS2 signal wire…should not be seeing 0.18 volts on that signal wire…must also check pin fitment on pin F…see you tomorrow !!
Latest update. I have some great people helping me try to figure this out. So far we are all scratching our heads on this one. Have a TAC module coming. Fingers crossed this will fix the issue.
Latest update. I have some great people helping me try to figure this out. So far we are all scratching our heads on this one. Have a TAC module coming. Fingers crossed this will fix the issue.
Tim, we’ll we verified the TPS is working as it should using scan data and your test of the TAC motor was OK…APP voltages also good but the TPS sensor connector may be suspect…I can’t remember if we looked at TPS1 voltages to see why we were getting the “correlation code”…the P1221…the PCM looks like it’s getting the correct inputs so the only thing it can be is the TAC module if not the connector.
Code 1220 and 1221
