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Ls1 swap, now only temp and voltmeter work RESOLVED I swapped a Ls1T56 into my 1990 RS that was originally a 305 tbi 700 r4 car. I did the harness myself using Pocket's walk throughs and felt I did a good job. Now post swap I have no tach, speedometer, oil pressure or fuel gauges. I have taken the c100 apart and cleaned the terminals and that didn't do anything, I also pulled the cluster and cleaned the printed board as well as the dash connectors. Any ideas folks? |
Re: Ls1 swap, now only temp and voltmeter work Some aditional info: With the key off and the parking brakes on all of the dash back lighting works. When you turn the key to run, the bulb to the right of the speedometer goes out. |
Re: Ls1 swap, now only temp and voltmeter work Tach Did you change the settings in the PCM? If not, did you build a pull up circuit so the signal is strong enough for the factory tach to work? Speedo Did you bypass the VSS buffer box the TBI cars have? If not, then the speedo won't work. Fuel Did you swap tanks? If so, did you mod the sending unit to read 0-90 ohms? If its the factory tank and sender, perhaps the float is stuck. Especially if you dropped it and swapped the pump out. Hope that points you (and others) in the right direction |
Re: Ls1 swap, now only temp and voltmeter work
Originally Posted by Jaysz28
(Post 6053792)
Tach Did you change the settings in the PCM? If not, did you build a pull up circuit so the signal is strong enough for the factory tach to work? Speedo Did you bypass the VSS buffer box the TBI cars have? If not, then the speedo won't work. Fuel Did you swap tanks? If so, did you mod the sending unit to read 0-90 ohms? If its the factory tank and sender, perhaps the float is stuck. Especially if you dropped it and swapped the pump out. Hope that points you (and others) in the right direction I did indeed bypass the buffer box for the vss I am using the factory sending unit and it worked before the swap. In fact I did not even drop the tank because I already had a high pressure pump I had installed in it. Banging on the dash doesn't even get a thing to move and I have pulled the cluster and flared the connectors a bit to no result. I'm leaning toward a ground problem because when I press the clutch the security light barely glows. This is odd being it is only wired to the ecm and the safety switch. Non of which go through the cluster. Does anyone know where the cluster grounds? |
Re: Ls1 swap, now only temp and voltmeter work Resolved! It was indeed a ground problem. It was the black/white wire that went to C207. The csm is worthless in that it identifies the colors but not where they go. While I had the cluster out I found a pinout on tgo and ran a continuity test on each ground wire. |
Re: Ls1 swap, now only temp and voltmeter work RESOLVED Thanks for posting the solution to your issue Hopefully it will help others with their issues. |
Re: Ls1 swap, now only temp and voltmeter work RESOLVED No problem, thanks for your suggestions! I hate when I'm searching threads and find one on my problem but the op never posted their resolution. |
Re: Ls1 swap, now only temp and voltmeter work RESOLVED Odd The gauge cluster ground wire goes through the C100 for 90-92. On 82-89 is a C207 pin Glad it was something simple |
Re: Ls1 swap, now only temp and voltmeter work RESOLVED It's a 1990 RS tbi car originally. The pin out has 4 grounds on the gauge plugs. The missing one was blk/why so I checked continuity to the blk/what in the C207 and it beeped. Made me really happy. The C207 seems to have a few different pin outs from tpi to tbi to v6. |
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