sd92129

You may already know this, but if you disconnected the battery at anytime, the ECU will lose its learned settings and have to relearn them over the course of a few hours of driving. So the idle may be a bit off for awhile. Also, when warm, idle in park or neutral should be about 950. Idle in a gear like D, 2, 1 with the brakes applied is more like 750. The ranges on these values are +/- 50 rpm.

Just wanted to share this with the community and potentially help someone save a couple hundred bucks. Sorry there are no pictures. I was having problems with my drl's, more specifically, they were not working. The vehicle is a canadian 1998 SE. The regular light were fine as were the high beams. Instead of dropping 200 on a new module (or there abouts), I pulled the module out. On the 1998, it is a 3"X2"X1" black plastic box located in the engine compartment on the passenger side wheel well hidden by the battery. So removal of the battery and disconnecting the 2 wire harnesses and one bolt allows removal of the module. The module can be disassembled, but a fair amount of force is required. the wire harness end pulls out of the plastic cover revealing a circuit board. In my case, one of the 2 larger components (presumably relays) had a questionable solder arguably caused by significant electrical currents, heat and age. Anyways, I resoldered that connection, popped the unit back together and reinstalled. Et voila, drls were fine again. So, in summary, if you are handy enough to do the above, this could be a possible solution if you daytime running lights are not working. Note, with the module removed, you will have no lights. So it is possible, other headlight issues could be caused by a faulty circuit in the drl module.

the ony way you can proactively kill it by accident is if you damage the platinum heating elements/wires. dont forget to pull the battery and let the ecm reset. it may then run a bit rough for about 20 minutes as it relearns all the parameters (paraphrasing the manuals). or you could let it throw a code if cleaning made a huge difference, then as you clear the code, the ecm looks for new parameters for the MAF without messing with the other stored parameters. if it is bad mileage, cleaning MAF is a good/inexpensive thing to do. if the maf is damaged or dying, driveability will suffer (ie. bad idle, stalling, etc.)