My service engine light came on today, it comes and goes when Im stopped at a light it will go off but as soon as I touch the gas it comes back on. I went to Advance Auto parts to have them read the code and the code that came up is #29 which printed out as "output driver module (ODM) fault. EAS circuit."

If anyone knows what this code means or what I need to do to fix it, it would be great since I have to make a 600 mile road trip home on sunday.

I dont think it has anything to do with this code but I just installed my Moroso CAI yesterday, because I drove last night and this morning with no light on before the light came on this afternoon.

Thanks for the help in advance
Kevin

 

Well, according to shoebox's site, code 29 is for the AIR pump circuit. Did you put the AIR hose back on the new CAI? Did you unplug the pump at any point? Perhaps check the AIR pump relay and fuse?

 

Yes, use the code list on Shoebox's website - it is LT1-specific, and reflects the differences in the codes between the 93's and the 94/95 OBD-I cars. Your code description is for a 93.

The only check the OBD-I system makes on AIR is that the circuit for the AIR pump has power. 99 times out of 100, its a blown fuse. You can unplug the pump and not get a code, as long as there is a good fuse in the circuit. And unlike OBD-II, there is no way for the PCM to know if any other parts of the system are connected or operational.

 

ttt, I checked everything today and everything is conected correctly and sealed up nice and tight. I might try putting the stock air box back on tomorrow just to see if that will fix the problem.

 

Did you check the AIR pump fuse?

 

Yea, my girlfriend got that same code on her 95 z28. Replaced the fuse and wellah!

 

yea i just replaced the fuse, and took it for a little drive without the light coming on. Now I just wonder what caused the fuse to blow.

 

It isn't unusual for the pumps to rust up and draw excessive amps. Couple that to the fact the wiring was marginal (95 and newers were recalled) and you can see a possible cause. With the engine running, feel the rubber hoses on the upstream side of the AIR check valves. A leaking check valve will allow exhaust to flow out of the valve, into the hoses and into the cold AIR pump, where the water in the exhaust condeses out, causing the rust. If one of the check valves is leaking, the hose will be excessively hot.

 

So if the blown fuse was indeed caused by rust, that means that the fuse will blow again if the rust is not cleaned up. Right?

 

thats what I want to know also, because if the fuse is gonna keep blowing then I want to fix the problem correctly.

 

Its hard to say with absolute certainty what caused the fuse to blow. The suggestion I gave was on common possibility. The method I suggested of looking for hot spots in the hoses was a simple way to check a possible source of the problem. Did you try it?

See how long it takes for the fuse to blow again. You could check for damage to the wiring, possibly something got wet and shorted out temporarily. You could activate the pump and listen to see if it seems noisier than normal. Its been running for 11 years. Maybe the bearings are going.... maybe the motor windings are losing their insulation value..... many possibilities.