VATS bypass
Melting Slicks
Joined: Aug 2011
Posts: 2,844
Likes: 176
https://www.gearhead-efi.com/Fuel-In...mation-DA2-DA3
The pinout and schematic for the 92-93 lt1 ecm. If sea is on the ecm is powered up. The ecm should do a 2sec control of fp relay. Sounds as if you ecm still isn’t working properly. Iirc it’s a firmware default to do the prime not related to the chips settings. Concerning the fan kicks on Koeo.
The pinout and schematic for the 92-93 lt1 ecm. If sea is on the ecm is powered up. The ecm should do a 2sec control of fp relay. Sounds as if you ecm still isn’t working properly. Iirc it’s a firmware default to do the prime not related to the chips settings. Concerning the fan kicks on Koeo.
Melting Slicks
Joined: Nov 2016
Posts: 2,253
Likes: 3,076
From: So Cal
2023 C4 of the Year Finalist - Unmodified
There are 4 different "starter relay" circuits and strategy in the 13 model years of "C4". 84-85, 86-89, 90-92, and 93-96.
All 4 are in this thread now. The nuances of the particular year isn't being addressed or discussed. Without disclosing the actual year, and the respondent being familiar with that particular year's set-up, y'all are going be frustrated.
All 4 are in this thread now. The nuances of the particular year isn't being addressed or discussed. Without disclosing the actual year, and the respondent being familiar with that particular year's set-up, y'all are going be frustrated.
Last edited by IHBD; Aug 3, 2025 at 07:44 PM.
Intermediate
Joined: Apr 2025
Posts: 47
Likes: 6
Mine is 89 and I did the jumper wire bypass for the relay. I was able to pop the plastic top cap off my old relay so i shoved the bypass connector into that plastic cap so i could screw it back onto the middle divider and slide it back in place. It seemed there wasn't a lot of tension on the bypass wire spade connectors into factory harness so I am concerned they could rattle loose over time. Hoping this might keep it a bit more secure and from moving around too much. i will keep a Philips screwdriver and 7mm socket handy if i need to dig into it again. Car started fine, no issue. i need to take long drive to see if it fixed the hot no-start issue i was having.
My replacement relay from Ebay arrives this week. i ordered it before i saw Tunedport90s fix. I don't plan to install it.
My replacement relay from Ebay arrives this week. i ordered it before i saw Tunedport90s fix. I don't plan to install it.
Intermediate
Joined: Apr 2025
Posts: 47
Likes: 6
Friday we went for 1.5 hour drive and no issue, same when we came home driving another 1.5 hours. Today I drove 15 mins , spent 10-15 mins with glass guy then it wouldnt start.
When I bypassed the "starter enable relay" behind console, does this completely bypass the VATS...as in chipped key is bypassed and it should work like regular ignition that I just turn to start?
I also tried shifting into N to start, no luck. It is not making any sounds at all, I don't hear click and obviously no crank.
When I bypassed the "starter enable relay" behind console, does this completely bypass the VATS...as in chipped key is bypassed and it should work like regular ignition that I just turn to start?
I also tried shifting into N to start, no luck. It is not making any sounds at all, I don't hear click and obviously no crank.
