Does anybody know which dash instruments are wired through the ECM module.
Reason for question is that I'm planning a new engine, that will use a seperate unique engine control computer, and I need to figure out wiring details for the swap.
Thanks.
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10:05 AM
PFF
System Bot
fieroguru Member
Posts: 12477 From: Champaign, IL Registered: Aug 2003
The check engine light and the upshift lights do need an ecm signal. As far as the rest of the guages....they work fine without an ECM (ran carb for a year without an ecm).
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10:17 AM
tesmith66 Member
Posts: 7355 From: Jerseyville, IL Registered: Sep 2001
So the wires that run from the various sensors on the engine (water temp and oil pressure) don't actually go into the ECM? I'm trimming down the harness for a V8 swap, with a carb, and was going to hook the ECM back up. If I don't use the ECM, then the sensor wires won't go anywhere. The wires terminate at the ECM plug now, so if I don't hook up the ECM, where do the various sensor wires go?
thanks, Rick
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10:54 AM
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
Originally posted by couldahadaV8: So the wires that run from the various sensors on the engine (water temp and oil pressure) don't actually go into the ECM? I'm trimming down the harness for a V8 swap, with a carb, and was going to hook the ECM back up. If I don't use the ECM, then the sensor wires won't go anywhere. The wires terminate at the ECM plug now, so if I don't hook up the ECM, where do the various sensor wires go?
thanks, Rick
the C203 connector - its the 15pin connector near the ECM where the wires go thru the firewall, under center console. as mentioned above - the shift light & the "Check Engine" light are the only things on the dash which have ECM input.
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11:46 AM
fieroguru Member
Posts: 12477 From: Champaign, IL Registered: Aug 2003
So the wires that run from the various sensors on the engine (water temp and oil pressure) don't actually go into the ECM? I'm trimming down the harness for a V8 swap, with a carb, and was going to hook the ECM back up. If I don't use the ECM, then the sensor wires won't go anywhere. The wires terminate at the ECM plug now, so if I don't hook up the ECM, where do the various sensor wires go?
thanks, Rick
The easy way to do the carb wiring is remove all wires that connect to the ECM connectors (you will keep the 203 and 500 connectors, but none of the ECM ones). You will be left with starter, alt, A/C, ignition/dist, temp sender, fan thermal switch, oil pressure sender, VSS, A/C and fuel pump relays.... and a pile of other wires that are not needed.