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96 GTS Coupe

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96 GTS Coupe
Old June 7th, 2011, 02:57 PM   #1
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96 GTS Coupe

Hello all,

Im the new owner of a 1996 GTS with 19K miles........and some front end damage! No, I didn't do it, I bought it that way. Anyway, I'm in the process of getting back on the road and have a question that isn't covered in the shop manual and hoped for some insight from anyone out there. Immediately upon start up, the engine tries to rev as if it were in WOT..... I pulled the codes and found 2 new TPS high voltage. With the TPS still connected and closed throttle, I have 5V supply, .8V signal, and of course ground. However, if I unplug the TPS, the voltages at the wiring harness are 5.1 supply, 4.6 signal, and 1.1V at the ground??? I'm an aircraft mechanic so I understand these things, but I'm new to this Viper and not sure if someone else may have experienced this..... ps verified no vacuum leaks too. Any help is appreciated.

Also, I have some parts from a 97 GTS, that was converted to a racecar, so I have a lot of electrical harness, PDU, keyswitch with key and FOB, airbag control box, turn signal switch, the internal components of a headlight, seat belt (not detonated)......

Last edited by mybrokencoupe96; June 7th, 2011 at 03:43 PM.
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Old June 7th, 2011, 03:42 PM   #2
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Does the '96 model have the 3 additional manuals like my '01 does? Like the Powertrain manual would be real handy for that.
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Old June 7th, 2011, 04:36 PM   #3
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Good question. The manual I have does have the wiring charts and PMC pinouts/voltages though. I just now found a pinched harness that links at the LH front wheel house that so far goes to the TPS, Coolant Temp sensor, and possibly the IAC, but I dont have any new codes. Between that and the 100 degree temp in the garage..... its bringin' me down!
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Old June 7th, 2011, 04:53 PM   #4
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The Powertrain Diagnostic Manual is different from the service manual with all the wiring diagrams.
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Old June 7th, 2011, 05:04 PM   #5
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Dave6666, you are correct. There is a PCM troubleshooting guide for the 96 GTSs'. I think that would definitely help!!!
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Old June 7th, 2011, 05:46 PM   #6
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TPS can idle up a certain amount sure, but without "mechanically" opening something for the air, I don't see it screaming up like WOT would do.

How many RPM are you seeing? Have you ruled out a mechanical problem around throttlebodies? Have you checked the idle-control solenoid behind the passenger-side throttlebody? What have you ruled out?
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Old June 7th, 2011, 09:43 PM   #7
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I'll have my '01 book tomorrow I can email you the pages the basics are probably the same. PM me your email if that would rock sir.
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Old June 8th, 2011, 08:39 AM   #8
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Quote:
Originally Posted by coupe View Post
TPS can idle up a certain amount sure, but without "mechanically" opening something for the air, I don't see it screaming up like WOT would do.

How many RPM are you seeing? Have you ruled out a mechanical problem around throttlebodies? Have you checked the idle-control solenoid behind the passenger-side throttlebody? What have you ruled out?
I agree Coupe Enthusiast, it's got to be getting air from somewhere too. I was reacting first based on the trouble codes. I don't know how far it will rev, I shut it down before it gets past 3500 rpm. I've been getting familiar with as many components as I can and read the DNO for the IAC motor. Both butterflies remain in the idle position and open normally. Can the IAC be bench checked?

Last edited by mybrokencoupe96; June 8th, 2011 at 09:01 AM.
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Old June 8th, 2011, 08:43 AM   #9
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Dave6666, that would be great! What's the best method to get that info. from you?
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Just a thought
Old June 8th, 2011, 09:22 AM   #10
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Just a thought

What about disconnecting the battery for 15 minutes so everything re-sets?
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Old June 8th, 2011, 09:50 AM   #11
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I'll give it a shot, does it have to be disconnected at the battery or can I disconnect it at the PDU?
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Old June 8th, 2011, 02:47 PM   #12
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I would disconnect at the battery. The positive stud up front is notorious for "twisting" out and ruining the wiring inside.

To check the IAC, I would just remove it and hold your hand over the hole that the IAC controls, then have someone start the car... That'll tell you if it was throttling air at the IAC.
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