How can I check the ignition control module?
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
How can I check the ignition control module?
'93 LT1; Helms gives a brief description of what it is and that's all. Any way to check it before I replace it and find out it's not the problem?
Team Owner
Joined: Dec 2000
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From: SE NY
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Measure the resistance across the chip in the key and buy a 1/4 Watt resistor of the same resistance at Radio Shack.
Then remove the LH hush panel, locate the small connector with the small Red & Yel wires and jumper, open the connector, jumper the resistor across the contacts and start the engine.
If that cures a no start problem, have the key and/or lock cylinder replaced.
Note that on a vehicle with a DS air bag you need to be careful in removing the steering wheel.
Then remove the LH hush panel, locate the small connector with the small Red & Yel wires and jumper, open the connector, jumper the resistor across the contacts and start the engine.
If that cures a no start problem, have the key and/or lock cylinder replaced.
Note that on a vehicle with a DS air bag you need to be careful in removing the steering wheel.
Le Mans Master
Joined: Dec 2004
Posts: 5,789
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From: Myrtle Beach SC
St. Jude Donor '05-'06
Scary it makes it hard to help you if you keep starting new threads.People can't follow what you have done.Try to stick with this one till you get it running.I would suggest a short run down of what you have done (Including codes)so far to get it all in one thread.In an earlier thread you said you HAD spark,How did you determine that?
Have you cleared your codes and rechecked them after trying to start it?
Did you recheck your installation of the opti in the first place?
I told you it was possible to install it wrong.
Please recap your trouble here and answer the questions and I am sure someone will get her runnin.
Have you cleared your codes and rechecked them after trying to start it?
Did you recheck your installation of the opti in the first place?
I told you it was possible to install it wrong.
Please recap your trouble here and answer the questions and I am sure someone will get her runnin.
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Redeasysport - I agree with your point but as this problem has progressed the symptoms have changed. I was trying to keep to the old one but the title was regarding the optispark, but the part in question is no longer that...
Someone who had problems with their Ig module may never have looked at the other thread. I was hoping for a quick answer to this question to post back in the main thread.
Can you change the title of an established thread? That might help.
Anyway, I did clear codes and re-check and the same ones exist. (28 and 66). The QDM circuitry is in the ECM itself so I had hoped that my ECM swap would be the answer.
I did go over thoroughly the opti install on tuesday and found that I had a problem but rectified it. I checked spark with a spark tester at the plug end of the wire and had it but it seemed a little weak.
The other thread remains active, I just hadn't received any thoughts on the ignition module on it.
65Z01, I did bridge the VATS system, to redeasy's credit it's explained in my other post...thanks for the suggestion.
Someone who had problems with their Ig module may never have looked at the other thread. I was hoping for a quick answer to this question to post back in the main thread.
Can you change the title of an established thread? That might help.
Anyway, I did clear codes and re-check and the same ones exist. (28 and 66). The QDM circuitry is in the ECM itself so I had hoped that my ECM swap would be the answer.
I did go over thoroughly the opti install on tuesday and found that I had a problem but rectified it. I checked spark with a spark tester at the plug end of the wire and had it but it seemed a little weak.
The other thread remains active, I just hadn't received any thoughts on the ignition module on it.
65Z01, I did bridge the VATS system, to redeasy's credit it's explained in my other post...thanks for the suggestion.
Racer
Joined: Dec 2004
Posts: 427
Likes: 0
From: Albuquerque New Mexico
no test on IC module
As I understand it, the IC module on LTx's cannot be tested off the car. The only way I know of to test the IC module is to determine if spark is coming off the coil. A much more thorough test would be to swap IC modules with one that you know works (like a buddy, or for the less honest just swap in a new one and see what happens, most likely no auto parts store will ever know).
-DAve
-DAve
Safety Car
Joined: Oct 2000
Posts: 4,236
Likes: 355
From: Albuquerque, NM
Originally Posted by drochau
for the less honest just swap in a new one and see what happens, most likely no auto parts store will ever know).
-DAve
-DAve
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From: Fort Knox, KY
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If you do replace it, be sure and coat the back of the module with that little packet of thermal-transfer grease compound.
This thin layer of grease improves the transfer of heat produced by the module to the housing and is very important to the life of the module. (Do not confuse common dielectric grease with this thermal-transfer grease. They’re completely different.)
This thin layer of grease improves the transfer of heat produced by the module to the housing and is very important to the life of the module. (Do not confuse common dielectric grease with this thermal-transfer grease. They’re completely different.)
Thread Starter
Safety Car
Joined: Jul 2001
Posts: 4,871
Likes: 15
From: Detroit's West Side MI
Originally Posted by onedef92
If you do replace it, be sure and coat the back of the module with that little packet of thermal-transfer grease compound.
This thin layer of grease improves the transfer of heat produced by the module to the housing and is very important to the life of the module. (Do not confuse common dielectric grease with this thermal-transfer grease. They’re completely different.)
This thin layer of grease improves the transfer of heat produced by the module to the housing and is very important to the life of the module. (Do not confuse common dielectric grease with this thermal-transfer grease. They’re completely different.)
Thanks for the tip.
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From: Fort Knox, KY
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Originally Posted by ScaryFast
I asked the salesman about the grease and he suggested dialectric...I thought it sounded fishy to me.
Thanks for the tip.
Thanks for the tip.
Team Owner
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From: Fort Knox, KY
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Originally Posted by VictorRussell'92
Where is the ICM located?
http://shbox.com/1/coil_loc.jpg
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Originally Posted by STL94LT1
It's on the right side, on my 94.
Le Mans Master
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Originally Posted by ScaryFast
I have silicone heat sink paste for installing micros onto motherboards (PC's). Same thing I need for this? I assume so...
