91 Olds 98 Fuse #6 Dash, Service Engine S

[Rogerkay]

Once again any help would be appreciated. Any quality service manuals out there or wiring diagrams?

[Mickey#1]

All I have is a Chiltons manual for the Olds 88 & that mostly covers the engine. You should see what the local library has. Can you post a link to what you found @ AZ.

[Mickey#1]

I found the wiring diagram @ AZ & it's the same crappy diagram that the Chiltons manual uses. Anyway it looks like fuse #6 (6 amp not 15) is for the coolant fan relays. Are those 2 of the relays you tried removing?

BTW - that diagram shows the ICM getting power from fuse #7 not #6. It doesn't specify whether its fuse #7 in the relay center or #7 in the insrument fuse box.

[Rogerkay]

The diagrams on az are wrong. The diagrams for a 92 are more correct. Fuse 6 = 15 amp ip drivers side. I just did some more tests again and found that measuring resistance to ground from the dead side of the fuse is 1.5 ohms with ignition off, 8 ohms with ign on, but I also read a .1 volt on the dead sid e of the fuse 6. So I disconnected the positive side of battery and redid ohms. Now it is 1 ohm in both positions so I'm getting some bleed of voltage that is throwing off my readings. Realistically that 1 ohm is a dead short. have about .6 ohm in my wiring in the meter. I'm going to pull off the dash gauges again and try to ohm out each wire to ground. Maybe I can get a dead short on one then at least I can identify the circuit. Tell me what you think. and thanks, its amazing when you know someone is trying to help it makes it so much easier. Its not such an alone feeling.

[Mickey#1]

I'm looking at the 92 AZ diagram. It shows these items on fuse #6:
Cooling fan relays.
Fuel pump & oil pressure sender.
ICM & fuel injectors.

I'm pretty certain that the fuel pump & oil pressure sender use fuse #6 on the passenger side. I have heard of the oil senders shorting out & blowing the fuse.

I'm not sure which of the #6 fuses the ICM & injectors are on. You already disconnected the ICM so you can try disconnecting the injectors but I wouldn't expect an injector to blow a fuse until the engine is cranking.

That leaves the coolant fans as the most likely suspect but you might have already checked those. Does the owner's manual show what else is connected to that circuit?

You may have to start checking all the wires for a short to ground.

Here's a link to a shop manual on Ebay.
http://cgi.ebay.com/ebaymotors/1991-...ayphotohosting

[Rogerkay]

Thanks Mickey, I will check wires and get the manual.

[Rogerkay]

Mickey thank you again, I couldn't find a short so I got frustrated and went and got a different instrument panel and that was the problem. Now I can read my codes and it looks like I was correct on the code 41. I just wanted to thank you and the forum for helping me along.
Roger

[Rogerkay]

I did buy that manual and thank you,
Roger

[Mickey#1]

So its no longer blowing fuses but still won't start?

The cam code can be caused by:
The cam sensor
The wiring harness that connects the cam sensor,ICM & ECM.
Sometimes the magnet that triggers the cam sensor falls out of the timing gear. You can check this by removing the cam sensor & looking for the magnet (or hole) while slowly turning over the engine with a wrench.

[Rogerkay]

Yes mickey magnet is gone, going to try to file off new magnet top and JB welding it in hole. DId get the car running actually runs very nice . Will run and start easier I'm sure after magnet is in. Thanks again Roger

[Rogerkay]

I have to add that the problem returned almost immediately. I ended up tracing everything and found a short in the rearview mirror circuit.