Holy fault codes.Where do I start?

liljoe07 · May 7, 2009

I havent seen the KOER codes. THose need to be ran. I looked back through the posts and only seen the KOEO codes. Need to run the KOER.

stoksuks · May 8, 2009

Well just did the KOER test.Turns out I have a 98 & 66 fault.

Joel5.0 · May 8, 2009

BINGO...... there's the reason for the CEL.....

stoksuks · May 8, 2009

Yup.I thought if Ive got faults they should show up under the KOEO test.Once again Im wrong.

Joel5.0 · May 8, 2009

Also keep in mind that code 98 is caused by the existence of code 66..... fix 66 and 98 will disappear.

stoksuks · May 8, 2009

Good info guys.So code 66 is for the maf or trans oil temp sensor,(I dont think I have one).Now when this thread started liljoe(thanks joe)provided the flow chart & everything checks out.Ive got a almost new pro-m maf on the car.Can I put a stocker on to test it? I dont even think it will run if im running 24 lb inj.Right?

Joel5.0 · May 8, 2009

MAF signal...... looks like you need to monitor that signal with a DVOM.... specially when the CEL turns on by checking the voltage near the ECM connector. LUK

liljoe07 · May 8, 2009

Redo the MAF test, and on the last step, with the DVOM to ground, test both MAF SIG and RTN. Both should be between .2-1.5v. I have the same meter as you, and mine was in those specs.

liljoe07 · May 8, 2009

Sorry Joel posted and didn't know you posted. This site needs a "warning new posts were posted while you was typing" like another GREAT site I know off!!!!

stoksuks · May 8, 2009

Thanks both of you for the info.Ill do as both of you suggested.BUT it wont be until next wk.Me & the wife leave Sat morning for a cruise to Bermuda.Damn I need it.But when I get back Ive got a few days before heading back to work so I can spend some time on it.thanks again guys.Ill let ya know how it turns out.Ill even have a drink for both of you.

stoksuks · May 8, 2009

liljoe07 said:
Redo the MAF test, and on the last step, with the DVOM to ground, test both MAF SIG and RTN. Both should be between .2-1.5v. I have the same meter as you, and mine was in those specs.

While running or key on?

liljoe07 · May 8, 2009

Same as the diagram I poster earlier. Just on the last test, with key running, dvom to ground and test maf sig and maf rtn. You may wanna do joels test first. And I'm posting from my phone, and can't remember what pin the maf sig at the ecm is. Maybe joel will tell you.

Pearl_LX · May 8, 2009

stoksuks said:
Good info guys.So code 66 is for the maf or trans oil temp sensor,(I dont think I have one).Now when this thread started liljoe(thanks joe)provided the flow chart & everything checks out.Ive got a almost new pro-m maf on the car.Can I put a stocker on to test it? I dont even think it will run if im running 24 lb inj.Right?

the car will idle fine with a stocker on it.

liljoe07 · May 8, 2009

And if the code goes away, it would indicate a bad MAF for the PMAS

stoksuks · May 8, 2009

I remembered Ive got a c&l maf sensor lying around thats calibrateed for 24lb ers.Guess I can hook it up just for a quick test.

liljoe07 · May 8, 2009

stoksuks · May 8, 2009

Well I just couldent go on vac not knowing if a maf would fix it so I left the eec unplugged for the day to clear the faults then I put my c&l on & fired it up.Unfortunately the cel came on within 5 sec of running it.I thought for sure it would fix it so I guess I have some wire diag to do when I get back.

liljoe07 · May 9, 2009

Try the alternate code clearing method. As soon as the KOEO starts to flash, remove the jumper(or scanner) then unhook battery for about 10mins. If you try Joel5.0 method of checking the MAF SIG wire at the ECM, Its PIN 50 on the ECM harness.

stoksuks · May 9, 2009

2 last questions before I call it quits for the night.I know I have to ck the voltage at pin 50 while running.Any clue what voltage I should have?
And when checking the last step at the maf (post 28) should the engine be running?
Thanks for all the help.Ive gotta get my butt off the computer & start packing.Have a good wk.

SSFenris · May 9, 2009

the VDC at pin 50 SHOULD correspond to the MAFSIG voltage (it's the other end of the wire). If that wire's bad (chafed, burned, shorted) there's your problem.

Holy fault codes.Where do I start?

liljoe07

stoksuks

Joel5.0

stoksuks

Joel5.0

stoksuks

Joel5.0

liljoe07

liljoe07

stoksuks

stoksuks

liljoe07

Pearl_LX

liljoe07

stoksuks

liljoe07

stoksuks

liljoe07

stoksuks

SSFenris

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