How to test for Opti Failure with no Present Codes...? [Archive]

Cross

10-18-2008, 04:25 PM

So I have finished my motor swap from my 96 (I did do the ICM, Coil and Knock Sensor and I did not transfer any wiring harnesses everything that was in the 94 Stayed in the 94) into its new body a 94 Formula with TA Bumpers and Fiberglass Hatch.

However I am not getting any spark... I have ordered a new Opti it should be here shortly. (Hour or so according to Autozone who was the only place to carry it... Yes I know they are less then stellar but at this point I am out of options)

So what I want to know since no one seems to have any idea's why I am not getting spark at the main coil is what can I do to test the Opti without removing it? Is there anything?

I used my new AutoXray I just bought as well... (God I have spent to much today) and it says there are no codes in the system.

Anything?

Cross

10-18-2008, 05:15 PM

I found this on LS1Tech back from a 2006 Post but some may find it useful as I just did. Here ya go:
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Hey man had the same exact problem but took everyone's word for it and got a new opti and that wasn't the problem it ended up being the icm here's the steps I USED TO FIND THE PROBLEM

The first thing we will do is verify the optical sensor is working correctly. And here is how..

Unhook 1 fuel injector connector. With your test light check for pulsing ground on the NON PINK wire while cranking the engine (different years use different color wires but all year have pink wires for the positive voltage side of the connectors) The other choice you have is to use the noid light (noid light AZ OEM part number 25143), plug the noid light into the connector and crank the car. The light should flash..

Do you have a flashing ground while cranking?

Yes, the optical sensor is sending the signal and should be ok, continue to test the ignition system.

No, the optical sensor is not working see testing opti section.

Next we will see if the coil and ICM are causing the no spark.
First on the ICM connector with KOEO check for hot (93-95) on the Pink/Black and white/black wires or (96-97) on the Pink and Dark green wires. Do you have hot?

Yes, next step
No, (93-95) Check for hot at the pink wire a the ign coil. If you have power at the coil, but not at the ICM, The coil is shorted and preventing power from reaching the ICM. Replace the coil and retest. If you do not have hot at the coils pink wire, check the 10 amp Ign fuse. Repair as needed and retest.
(96-97) If you are missing hot on both wires at the module, check the 10amp ign fuse, Repair and retest. If you are missing hot only on the dark green wire, but not he pink wire, the coil has shorted and is preventing the voltage from reaching the module and must be replaced.

Next check for ground on the black wire. do you have ground?

Yes, next step
no, repair ground

next test for a pulsing ground at the dark green wire(96-97) or the White/black wire (93-95) at the coil coming from the ICM. Do you have a pulsing ground?

Yes, next step
No Replace the ICM *note, I have seen a bad coil burn up an ICM. It might be a good time to replace or upgrade your coil*

next with your test light check for hot on the Pink wire at the coil. do you have hot?
Yes, Replace your coil *note, High resistance from bad plug wires can burn out coils. You can Ohm test plug wires or replace them if wanted*

No, Check and repair ign fuse and retest

OPTI testing

If you failed the injector pulse test we must make sure that all the power is getting to the opti.

With the test light and the car on KOEO, unplug the opti connector at the optispark and test for hot at the red wire at the opti. do you have hot?

If yes. Next step

if no, the pos feed comes from the computer. Check that the PCM is sending the signal, if not then you might have a faulty PCM

Next, using a multi meter on volts scale, test the red/black and purple/white wires for 5 volts. Do you have 5 Volts?
Yes, next step
No, The 5 volt reference is provided by the PCM, possible PCM failure or PCM power feed problem

Next, test the pink/black wire for ground. Do you have ground?
Yes, then the optical sensor is not working and is probably bad. based on the other tests run this is causing your no spark condition. It’s time to replace your opti. You can also check for corrosion or damage to the opti connector and replace as needed.

No, the ground is provided by the PCM, possible PCM failure or PCM power feed problem.

Google dumdumdum.

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