Well a few months ago my SES light came on so I had my friend with a snap on scanner read the codes. The only code that came up was the cam shaft positioning sensor was bad or needed to be aligned well I quickly found out that it can’t be moved so I went out and got a new one. After replacing it I went for a test drive. Everything was fine until I decided to turn the car off and restart it. Well 3 seconds after I did so the SES light came right back on. What else could be wrong????? I have a 97 z28 M6 with 83,000 on the clock. Oo yea and the light is ALWAYS on the only times that it turns off is if the car sits for a few days. Then after about ½ hr of driving its back on..

 

Any new codes?
Here's the list of codes for 97 LT-1's
http://users.adelphia.net/~showtime89/codes.pdf

 

The purpose of the SES is so you don't have to guess at what the trouble is. Get it scanned again to see what it is. If you have them in your area, Autozone will scan it for free .

 

my friend has a scanner. he jsut has to remember to bring it to work. the last time he scanned it it was a bad crank senser i replaced it an it didn't help

 

If it makes you feel any better, the crank position sensor's only real purpose is to detect misfires. It does not have any effect on driveability. Maybe you will come up with a new code to play with.

 

where can I get one of these scanners for codes? I have a 95 z28.

 

I think plaes like www.jegs.com , www.summitracing.com , and www.thunderracing.com sell them your looking for an OBD I scanner if its a 95 and an OBD II scanner if its 96 or up. They run between $150 and $200 last time i checked.

 

the code is P033C

 

Maybe P0336? There is no P033C.

 

my friend scanned it again... and again the only code that came up was the crank.. i have replaced that sencer last week . opti?????? any other idears anyone???

 

If the CPS is new and the wiring harness checks out, then it's the PCM. There are flow charts for diagnostics. They really do work if you use them.

 

flow charts?? need more info

 

can someone give me some hints??? before i brink it to the dealer so that they can charge me an arm and a leg

 

If you want to do your own troubleshooting, you need a manual. They are a good investment.

Here are a few basic things you can check:

unplug the harness

key ON

check for 12v on the terminal of the pink wire (cavity "A")

check for 5v on the terminal of the yellow wire (cavity "C")

cavity "B" will have 0-5v dependent on the output of the opti

make sure the wiring for the sensor is not routed next to a spark plug wire

 

cavity "A" 12v

Cavity "C" .043

cavity "B" .043

cavity "C" the yellow wire sould be 5v right