C5 Corvette P1516 REP
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Intermediate
Joined: Jan 2016
Posts: 35
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C5 Corvette P1516 REP
Searched on here and have tried all the other recommendations on how to solve this issue yet we still can't seem to get it going right....
2000 Corvette FRC running a NW102
problem i'm having is even turning the key on without cranking, im getting REP with P1516. I have checked the tb adapter harness, the pinouts to the factory harness and the adapter, everything checks out.
When I cylce the key on, you can hear the tb operate, yet if you touch the gas pedal, the throttle will click once and then not have any movement at all.
Car will fire off and instantly die
We have checked all ground, ran meters to make sure we have voltage where it needs it, and I have checked the harness multiple times. It's been multiple days on trying to solve this issue with nothing...
I can also clear the code via manual diag with the key on and it will stay 0 codes, however it will remain in REP. then if i cycle the key again it will return, along side a history P1515 and sometimes a P1518
Have checked connections down by the peddle, have changed to another NW102, as well as a stock LS7 tb off an 06' Z, and still nothing.
TAC module itself being bad? What would you guys think?
2000 Corvette FRC running a NW102
problem i'm having is even turning the key on without cranking, im getting REP with P1516. I have checked the tb adapter harness, the pinouts to the factory harness and the adapter, everything checks out.
When I cylce the key on, you can hear the tb operate, yet if you touch the gas pedal, the throttle will click once and then not have any movement at all.
Car will fire off and instantly die
We have checked all ground, ran meters to make sure we have voltage where it needs it, and I have checked the harness multiple times. It's been multiple days on trying to solve this issue with nothing...
I can also clear the code via manual diag with the key on and it will stay 0 codes, however it will remain in REP. then if i cycle the key again it will return, along side a history P1515 and sometimes a P1518
Have checked connections down by the peddle, have changed to another NW102, as well as a stock LS7 tb off an 06' Z, and still nothing.
TAC module itself being bad? What would you guys think?
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Searched on here and have tried all the other recommendations on how to solve this issue yet we still can't seem to get it going right....
2000 Corvette FRC running a NW102
problem i'm having is even turning the key on without cranking, im getting REP with P1516. I have checked the tb adapter harness, the pinouts to the factory harness and the adapter, everything checks out.
When I cylce the key on, you can hear the tb operate, yet if you touch the gas pedal, the throttle will click once and then not have any movement at all.
Car will fire off and instantly die
We have checked all ground, ran meters to make sure we have voltage where it needs it, and I have checked the harness multiple times. It's been multiple days on trying to solve this issue with nothing...
I can also clear the code via manual diag with the key on and it will stay 0 codes, however it will remain in REP. then if i cycle the key again it will return, along side a history P1515 and sometimes a P1518
Have checked connections down by the peddle, have changed to another NW102, as well as a stock LS7 tb off an 06' Z, and still nothing.
TAC module itself being bad? What would you guys think?
2000 Corvette FRC running a NW102
problem i'm having is even turning the key on without cranking, im getting REP with P1516. I have checked the tb adapter harness, the pinouts to the factory harness and the adapter, everything checks out.
When I cylce the key on, you can hear the tb operate, yet if you touch the gas pedal, the throttle will click once and then not have any movement at all.
Car will fire off and instantly die
We have checked all ground, ran meters to make sure we have voltage where it needs it, and I have checked the harness multiple times. It's been multiple days on trying to solve this issue with nothing...
I can also clear the code via manual diag with the key on and it will stay 0 codes, however it will remain in REP. then if i cycle the key again it will return, along side a history P1515 and sometimes a P1518
Have checked connections down by the peddle, have changed to another NW102, as well as a stock LS7 tb off an 06' Z, and still nothing.
TAC module itself being bad? What would you guys think?
Also, proper voltage levels are critical to the operation of this system.
Go to post #8 in this thread for the correct way to check battery voltage. https://www.corvetteforum.com/forums...-on-today.html
If you have bad contacts in the ignition switch it could also cause a problem. Pull minifuse #17 in the under hood fuse block. Measure the voltage on the power side of the fuse holder to a good ground point. With the ignition in the on position, you should read battery voltage. Be sure to check that the battery is fully charged before you do this step. If not, you aren't getting proper voltage to power the TAC Module. If it is OK, put the fuse back in and check that you have good power at the TAC Module, connector C2, pin 7, pink wire, CKT 539, (Ign Feed). If you have good power there, then the ignition circuit to the TAC module is OK. Also check that when the ignition is off there is no power going to the TAC module. The PCM has to power up before the TAC module.
If those things are good there are some other things you can check. Do you have a service manual?
Last edited by Greg_E; Sep 14, 2016 at 07:12 PM.
Thread Starter
Intermediate
Joined: Jan 2016
Posts: 35
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Have you checked the connections at the TAC module? A leaking battery can drip down, damaging the harness for the PCM and TAC module.
Also, proper voltage levels are critical to the operation of this system.
Go to post #8 in this thread for the correct way to check battery voltage. https://www.corvetteforum.com/forums...-on-today.html
If you have bad contacts in the ignition switch it could also cause a problem. Pull minifuse #17 in the under hood fuse block. Measure the voltage on the power side of the fuse holder to a good ground point. With the ignition in the on position, you should read battery voltage. Be sure to check that the battery is fully charged before you do this step. If not, you aren't getting proper voltage to power the TAC Module. If it is OK, put the fuse back in and check that you have good power at the TAC Module, connector C2, pin 7, pink wire, CKT 539, (Ign Feed). If you have good power there, then the ignition circuit to the TAC module is OK. Also check that when the ignition is off there is no power going to the TAC module. The PCM has to power up before the TAC module.
If those things are good there are some other things you can check. Do you have a service manual?
Also, proper voltage levels are critical to the operation of this system.
Go to post #8 in this thread for the correct way to check battery voltage. https://www.corvetteforum.com/forums...-on-today.html
If you have bad contacts in the ignition switch it could also cause a problem. Pull minifuse #17 in the under hood fuse block. Measure the voltage on the power side of the fuse holder to a good ground point. With the ignition in the on position, you should read battery voltage. Be sure to check that the battery is fully charged before you do this step. If not, you aren't getting proper voltage to power the TAC Module. If it is OK, put the fuse back in and check that you have good power at the TAC Module, connector C2, pin 7, pink wire, CKT 539, (Ign Feed). If you have good power there, then the ignition circuit to the TAC module is OK. Also check that when the ignition is off there is no power going to the TAC module. The PCM has to power up before the TAC module.
If those things are good there are some other things you can check. Do you have a service manual?
I will check what you had listed above and see if we cant find the gremlin through those.
Also, with scanning the car, I am getting reading for the Pedal position, just nothing from the Throttle position itself.
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Read your PM's.
I can't help with the NW102. I did read that some people have had a difficult time getting the tune correct when using them.
The LS2 TB should tell if it is the NW TB/Tuning or another issue.
I can't help with the NW102. I did read that some people have had a difficult time getting the tune correct when using them.
The LS2 TB should tell if it is the NW TB/Tuning or another issue.
Thread Starter
Intermediate
Joined: Jan 2016
Posts: 35
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Had a buddy stop by in his 05' C6 to throw the LS2 TB on, with no difference in situation. So we threw his TB back on his car and he left.
I then had a new TAC Box installed and still got no difference, at least with the NW102. So I am having my buddy come back today with the LS2 to try that out with the new TAC module.
Last edited by HoustonLSX; Sep 16, 2016 at 11:16 AM.
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Well i ended up ordering a new Casper harness adapter for the throttle body. Installed and got no change on the situation. I am also seeing that the harness that Casper sends is set up to have the 5v reference from the factory harness going to the Low reference on the throttle body. Is this correct or should it be switched? I tried both ways and got no change in my situation but I would like to know which way it should be going just so we dont add another problem to the situation.
Maybe someone with a working LS2 TB in a LS1 can verify how the adapter harness is wired. The wire colors in the adapter harness may be different than factory wiring. Just list what color goes to what connector and pin. LS1 and LS2 connector end views shown below. The first two are the LS1 connectors.
Thanks.
Last edited by Greg_E; Sep 18, 2016 at 06:58 AM.
Melting Slicks
Joined: Jun 2005
Posts: 3,088
Likes: 61
From: NY- 2013 Corvette Challenge Champion-2013 Index Combo Champion 2015 CC/MM Champion
St. Jude Donor '07
I had problems when I went to a NW102 TB I changed a few tables in the pcm with EFILive and it works fine now.
