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Discussion Starter · #1 ·
hey guys im getting a p1518 code and also reduced engine power but ive looked at all the connection and they look alright from what ive heard it could be the icm or the coil packs but also off of my icm connector there is a plain white wire kinda just sticking out the previous owner looks to have taken it and twisted it out of the way I just want my bird to work!!!!
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1994 Firebird Formula 381ci LT1 / TH400+GV O/D
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DTC P1518 = Throttle Actuator Control (TAC) Module Serial Data Circuit

The diagnostic monitors the accuracy of the serial data transmitted between the TAC Module and the PCM. If the PCM/TAC module detects a loss of data or invalid data, this DTC sets.

That's based on the 2000 factory manual. Don't have access to a 2001 manual. Doesn't sound like something related to the coils or ICM. It can be related to low system voltage. Does the dash gauge show a healthy 13+ volts at all times.

And you indicate you "looked at all the connection"...... do you mean the wiring between the PCM and the TAC, and the power supply and ground at the TAC.

You can download a free copy of the 2000 manual from the link in the top "pinned" thread on the topic listing for the Fourth Gen (this) forum. Maybe one of the late model V6 car owners can offer you more help than this. I know several of them have had problems with the electronically controlled throttle system.
 

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Discussion Starter · #3 ·
I meant the connection to the icm and the one to the tac but i cant tell if inside the wires might be messed up but ill c heck them out and report back
 

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1994 Firebird Formula 381ci LT1 / TH400+GV O/D
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Here's some related threads from "All Things V6" forum. Only the late (99+) V6 models use the drive-by-wire electronic throttle actuation. Earlier V6's and all V8's use the good old cable.

http://www.firebirdnation.com/forums/topic/521145-fly-by-wire-throttle-body-rebuild/

http://www.firebirdnation.com/forums/topic/468130-p1515-throttle-body-trouble/?hl=1518#entry937522

http://www.firebirdnation.com/forums/topic/97452-99-38-reduced-engine-power/?hl=1518#entry332200

Not a lot of help there, but might be of interest.
 

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Ramblin' Wreck
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Unfortunately that trouble code seems to be a real "red herring". It doesn't always mean what the explanation says. Evidently a lot of defects can cause that code to appear, anything from the throttle body or TAC, to a MAF sensor, EGR valve, ICM, etc.... Might be a good idea to get a cheap OBD2 scanner with live data to check some of those sensors. Note that one cause turned out to be a bad ignition relay (caused low voltage to TAC?, measure voltage at ETC fuse)

http://www.amazon.com/MS310-OBDII-EOBD-Code-Reader/dp/B005KOZ25Y

http://camaroforums.com/forum/93-02-v6-tech-14/code-p1518-41803/

http://www.camarozone.com/forum/f18/p1518-help-101476/
 
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