Need a little electrical info
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
Need a little electrical info
I started my engine today for the first time since the Pro Flo XT install. So far I only have one bug to work out, I have no power to my TPS. The symptoms I was experiencing all point to the tps, backfiring through the throttle body upon acceleration, extremely rich exhaust, and others. I pulled the connector of the tps and tested all 3 terminals with a lite and there is no power at all. I also repinned the ecm to the later 165 model but the tps wires are untouched in the change over. Anyone know where the tps get's it's power? I pulled each & every fuse but all were good. I bought a supposedly good used ecm, could it be that?
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
yep...grey wire, 5v ref from ECm. Dk Blu throttle input to ECM..black ground in ECM..NOT frame.
Check ECM power source at jumper post, fusable link, and ECM harness grounds on block/trans bellhousing bolt. There are multiple power sources to the ECM, some hot always, some hot key On, etc..Thats why you cannot assume just because some things do work in the ECM, that it has power everywhere. Different circuits/systems. Trace continuity from TPS plug to ecm grey wire C416. If its dead at the ecm....either power source or internal.
Check ECM power source at jumper post, fusable link, and ECM harness grounds on block/trans bellhousing bolt. There are multiple power sources to the ECM, some hot always, some hot key On, etc..Thats why you cannot assume just because some things do work in the ECM, that it has power everywhere. Different circuits/systems. Trace continuity from TPS plug to ecm grey wire C416. If its dead at the ecm....either power source or internal.
Team Owner
Joined: Jan 2003
Posts: 20,306
Likes: 242
From: Summerland B.C. Canada
Is there a code 22 stored ?
Is there 5v at ECM terminal C14 ?
http://members.shaw.ca/corvette86/En...agram%2086.pdf
Is there 5v at ECM terminal C14 ?
http://members.shaw.ca/corvette86/En...agram%2086.pdf
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
Hi Dan, I had a bad ecm, everything worked except the tps. Put a spare in I had bought and she popped right off. Of course since it was a holiday & everything closed I had my starter go bad before I got all the settings taken care of so I don't know if I have all the bugs out yet or not. Darn cheap mini starter, the bolt holes are elongated which was allowing the starter to **** off to one side. This doesn't do much for engagement. Got a new one on order, if anyone is looking for a mini, AMAZON has one right now for $61. & free shipping, normally it was much higher.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
http://www.ebay.com/itm/NEW-CHEVY-CO...3035f0&vxp=mtr
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