no codes, no 12's on the ecm, please read!
Thread Starter
Supreme Member
Joined: Oct 2000
Posts: 1,052
Likes: 0
From: Lima, Ohio
no codes, no 12's on the ecm, please read!
Guys, i posted something similar to this a few days ago.
The service light will not work(for diagonostic mode) or turn off at all. I checked all of the connections and even tried different memcal/prom combos. When the car is running , the service light is on constat. When trying to go to diagnostic mode, the light stays on constant still. Will not flash at all or do anything.
Bad ECM right?
I'm going to replace it soon, just want to know if there is anything i can check to make sure?
Brendan
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1987 IROC-Z L98 350 SuperRam, Edelbrock Performer 6085 Aluminum Heads, LPE RollerCam 219/219, Crane Gold Race 1.6RR, TF 1 pc Moly Pushrods, Underdrive Pulleys, Edelbrock TPI High Flow Base Manifold, Accel 58mm TB, ADS 24#, Crane AFPR, K&N, Edelbrock TES Headers, Catco Hi Flow Cat, 3" Borla Cat-Back, Accel Cap & Rotor, MSD 8.5mm, MSD 6AL Ignition, MSD Blaster 2 Ignition Coil, Hayes Clutch, 1LE Aluminum DS, 94' Z28 Disk Rear, Wilwood Adjustable Proportioning Valve, Torsen Series 3 Posi Carrier, Precision 3.73 Gears, Southside Machine Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,
To see the ROC, Check out the webpage Here
The service light will not work(for diagonostic mode) or turn off at all. I checked all of the connections and even tried different memcal/prom combos. When the car is running , the service light is on constat. When trying to go to diagnostic mode, the light stays on constant still. Will not flash at all or do anything.
Bad ECM right?
I'm going to replace it soon, just want to know if there is anything i can check to make sure?
Brendan
------------------
1987 IROC-Z L98 350 SuperRam, Edelbrock Performer 6085 Aluminum Heads, LPE RollerCam 219/219, Crane Gold Race 1.6RR, TF 1 pc Moly Pushrods, Underdrive Pulleys, Edelbrock TPI High Flow Base Manifold, Accel 58mm TB, ADS 24#, Crane AFPR, K&N, Edelbrock TES Headers, Catco Hi Flow Cat, 3" Borla Cat-Back, Accel Cap & Rotor, MSD 8.5mm, MSD 6AL Ignition, MSD Blaster 2 Ignition Coil, Hayes Clutch, 1LE Aluminum DS, 94' Z28 Disk Rear, Wilwood Adjustable Proportioning Valve, Torsen Series 3 Posi Carrier, Precision 3.73 Gears, Southside Machine Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,
To see the ROC, Check out the webpage Here
Senior Member
Joined: Aug 1999
Posts: 611
Likes: 0
From: Glendale, AZ
One way to check if you have a bad ECM is to hit it while the car is running. If you hear the motor skip a beat, then you do have a bad ECM.
You may want to take it to an electrical shop, sound like it may be a short.
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Rob
'86 TA 305 TPI
Gutted MAF
Ported Plenum
TB Bypass
You may want to take it to an electrical shop, sound like it may be a short.
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Rob
'86 TA 305 TPI
Gutted MAF
Ported Plenum
TB Bypass
Member
Joined: Jul 1999
Posts: 239
Likes: 0
From: Okarche, OK, USA
I'd get a service manual diagnostics chart out first. It could be a fuse, wire or ground to the ECM.
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Kyle Osterholt
Okarche, Oklahoma
ASE Master Certified
86 T/A 383 TPI
89 TTA #1002 T-top/Leather
89 TTA #1358 Hardtop/Leather
80 T/A Pace Car
73 Opel GT
73 bronco
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Kyle Osterholt
Okarche, Oklahoma
ASE Master Certified
86 T/A 383 TPI
89 TTA #1002 T-top/Leather
89 TTA #1358 Hardtop/Leather
80 T/A Pace Car
73 Opel GT
73 bronco
Member
Joined: Jan 2000
Posts: 248
Likes: 0
From: Lima Oh
I think you are in a world of hurt. Code 12 indicates the ecm is working properly and is in diagnostic mode. I don't think you have a wiring problem because the car runs. I would consult a diagnostic chart before condeming the ecm completely though.
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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter
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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter
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