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Old 08-23-2009, 03:36 PM   #1
Darren1970
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Idea Random no start fixed!

Ok everyone, thanks for your replies and I replaced the CPS last week. Not a bad job on that 2000 LW2. Car has been starting/running well since.

Next problem is one I forgot about... seems minor, but anyone got any clues to why the "Service" and "security" lights come on the dash when going down the road? Car is running fine when we notice that. A dirty contact somewhere? The repair demons still lurking? Will wait for response!!

Thanks everyone!

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Old 08-23-2009, 03:56 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Random no start fixed!

If the service engine soon light doesn't stay on long enough to stop by Autozone for their free scanning of error codes (write them down for posting here), about the best you can do for now is removing the battery negative cable for 5-minutes to reset any, er, anomalies when the cps went nuts. Sometimes electronics acts like we do and hold grudges by refusing to go along with the program and in this case the cps sometimes generate other issues downstream where sensors and diagnostics clash generating odd ball trouble codes that stay in memory. If this is the case, simply resetting the ECM memory (where the errant codes reside) erases them to have the ECM start all over again. At best, this doesn't come back and at worst it reappears to indicate other gremlims haven't been chased away.

When the cps was replaced, did you make sure it was seated all the way into its hole before tightening its mounting bolt? Some have mistakenly bolted their cps incorrectly without checking that it seated completely, leading to more problems until it was discovered it wasn't seated correctly. The little gap left caused more intermittent engine issues.

Last edited by fdryer; 08-23-2009 at 04:02 PM..

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Old 08-25-2009, 07:38 AM   #3
etp26
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Default Re: Random no start fixed!

Quote:
Originally Posted by Darren1970 View Post
Ok everyone, thanks for your replies and I replaced the CPS last week. Not a bad job on that 2000 LW2. Car has been starting/running well since.

Next problem is one I forgot about... seems minor, but anyone got any clues to why the "Service" and "security" lights come on the dash when going down the road? Car is running fine when we notice that. A dirty contact somewhere? The repair demons still lurking? Will wait for response!!

Thanks everyone!
"service" light or "service wrench" light?

If its the "service wrench" light and "security" light then I have the same problem. Hope someone has some answers.... Probably a bad BCM again.

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Old 08-25-2009, 08:45 AM   #4
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Default Re: Random no start fixed!

Guessing what the service/wrench service indicators means is doing things blindly.

1-The service light means almost any reader can decode stored errors. Tried Autozone? Generic error codes are typically P0xxx.

2-The service wrench light cannot be read by any reader except the pricier ones (like Saturn's) capable of reading manufacturer specific codes. These codes are P1xxx. Some members have spent ~$300 for their readers.

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