C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

datamaster wont sync with pcm

Old Aug 21, 2006 | 02:04 PM
  #1  
merlot566jka's Avatar
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Default datamaster wont sync with pcm

says ccm detected, but wont sync. ive read other posts, tried what they tried no avail.
im using home made cables and home made interface...two transistor style. i have pins 1,4, 6 jumpered and pins 7 and 8 jumpered, 9 blank.

this is on a 94, and the instructions i received say 9 on aldl is info, 16 is 12v and 4 is ground, it said to ground pin 4 to 5 on the aldl...sound right? so i have 4 jumpered to 5 and going back to the interface as the ground.

any help would be great!
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Old Aug 21, 2006 | 03:12 PM
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datamaster wont sync with pcm
Odds are about 99% that the problem is in your homemade cable.

i have pins 1,4, 6 jumpered and pins 7 and 8 jumpered, 9 blank.
What does this refer to? Pins on what? The only thing I can figure that it might be is the RS232 port, and you only need to be using the two signal pins plus ground there. That's pins 2, 3, and 5 on a DB9.

this is on a 94, and the instructions i received say 9 on aldl is info, 16 is 12v and 4 is ground, it said to ground pin 4 to 5 on the aldl...sound right? so i have 4 jumpered to 5 and going back to the interface as the ground.
You don't need to connect 4 and 5. You just need 9 (signal) and 4 (ground)
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Old Aug 21, 2006 | 03:40 PM
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the pins i was refering to are the rs-232 pins, sorry for not making that clear.
what could be wrong with my cable? its no different than any other cable, cept the fact that it doesnt have a platic connector, it ues pins just like any other cable...
ill disconnect the jumpers and give it a try
as for the 12v and ground where do i get those?
tried it without the jumpers, same thing....
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Old Aug 21, 2006 | 11:35 PM
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rebuilt the interface and cables, works great now. thanks for your help Vis Croceus
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Old Aug 22, 2006 | 12:31 AM
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Cool! Now the real fun begins...

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Old Aug 22, 2006 | 01:50 PM
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yea no joke, im trying to figure out what all this means!!
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