Service ASR Code 72
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
well, that isn't the ASR code 72... That's the thing with the newer C4s, they have three separate computers to choose from!
in this case, it's a serial data link error. you will need the Helm Factory Service Manual to help debug this. Hell, from what I can figure, you will need a series of specialized (re: GM dealer only) diagnostics tools. Think TECHII and you are getting close.
A hint - check circuit 800... and also be sure that the harness to the EBCM (the abs/asr brain under the left storage bin) is good (sometimes, water can get in). ckt 800 is a tan wire off the EBCM harness (pin 4) through a couple connectors (stays tan) to the ALDL (pin M) and then to the CCM, pin F12 & E13 (still tan) and feeds the two serial data lines.
Hope this helps.
in this case, it's a serial data link error. you will need the Helm Factory Service Manual to help debug this. Hell, from what I can figure, you will need a series of specialized (re: GM dealer only) diagnostics tools. Think TECHII and you are getting close.
A hint - check circuit 800... and also be sure that the harness to the EBCM (the abs/asr brain under the left storage bin) is good (sometimes, water can get in). ckt 800 is a tan wire off the EBCM harness (pin 4) through a couple connectors (stays tan) to the ALDL (pin M) and then to the CCM, pin F12 & E13 (still tan) and feeds the two serial data lines.
Hope this helps.
Drifting
Joined: Sep 2005
Posts: 1,867
Likes: 3
From: Pasadena Maryland
When I tried to diagnose Serial Data Faults the Manual called for a Kent Moore break out box along with a -10 adapter. The break out boxes are on e-bay for $20.00 to 100.00 but the -10 adapter is not to be found. Kent Moore says they will be available soon at $600.00 a piece. I went out on a limb and replaced my ECM, Got 1 off E-Bay for $150.00 and that fixed it. Cheaper then buying all the diagnostic tools.
Team Owner
Joined: Oct 2000
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From: Fort Knox, KY
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For the plugs, I like the NGK TR-55 Double Platinums. They'll work fine in your '92 LT1 engine just like mine.
For the plug wires, you can get the stock AC/Delco ignition wires at www.GMPartsDirect.com for $48.64 plus shipping. The GM part number for the ignition wire set is 12074093.
A lot of folks like the MSD or Taylor 8 mm wires, too. You can get them at AutoZone, Pep Boys and other auto parts stores.
Don't forget the anti-sieze compound for the plugs and be sure and remove them with the engine cold. Be ready to replace the plug wire holders, too, as engine heat makes them frail, brittle and easily broken as you remove the old wires.
You can get the O.E.M. GM style replacement plug wire holders at AutoZone. Ask for MotorMite item No. 40284. They run $3.99 for a set. You'll need two kits to do both sides of your engine.
For the plug wires, you can get the stock AC/Delco ignition wires at www.GMPartsDirect.com for $48.64 plus shipping. The GM part number for the ignition wire set is 12074093.
A lot of folks like the MSD or Taylor 8 mm wires, too. You can get them at AutoZone, Pep Boys and other auto parts stores.
Don't forget the anti-sieze compound for the plugs and be sure and remove them with the engine cold. Be ready to replace the plug wire holders, too, as engine heat makes them frail, brittle and easily broken as you remove the old wires.
You can get the O.E.M. GM style replacement plug wire holders at AutoZone. Ask for MotorMite item No. 40284. They run $3.99 for a set. You'll need two kits to do both sides of your engine.
Last edited by onedef92; Jun 8, 2007 at 10:06 AM.
Team Owner
Joined: Oct 2000
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From: Fort Knox, KY
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Team Owner
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From: Fort Knox, KY
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They've been discontinued by Eckler's Corvette Parts.
