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Old 07-12-2011, 04:47 PM   #21
Saturnino
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Default Re: 99 Saturn SL Electrical Nightmare?

Hey, I just had a thought!
Can an off brand, or non-OEM CPS be the cause of my woes?
I have already changed the CPS three times. What company is the original manufacturer of the Saturn CPS?

thanks
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Old 07-12-2011, 04:57 PM   #22
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Default Re: 99 Saturn SL Electrical Nightmare?

Quote:
Originally Posted by Saturnino View Post
Hey, I just had a thought!
Can an off brand, or non-OEM CPS be the cause of my woes?
I have already changed the CPS three times. What company is the original manufacturer of the Saturn CPS?

thanks
I've used aftermarket only as far as CPS and have not had trouble.
It is more likely the wiring/connector to it, than the sensor itself (after 3)
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Old 07-14-2011, 09:43 PM   #23
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Default Re: 99 Saturn SL Electrical Nightmare?

Could the ECU be sending bad information to the CPS and causing it to not send the correct signal to the ICM? I bet if I change the CPS the car will run for a couple of days and then stall again and not start, even after the engine has a chance to cool overnight.
Can a faulty ignition switch cause the CPS to fail, or send the wrong electrical impulses to the ECU and cause the ICM not to work?

I still haven't had a chance to go to the junkyard to find another ICM/coil pack.
Should I get an ECU as well, just for good measure?

thanks again to all who have contributed an answer!
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Old 07-14-2011, 10:16 PM   #24
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Default Re: 99 Saturn SL Electrical Nightmare?

If you start swapping PCMs have fun.

Replace the coils and ICM. Get a set from the JY and 2002 to 2000 is an upgrade if you remember to hang onto the long bolts and wire clips. Get one with clean not rusted coils.
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Old 07-14-2011, 11:59 PM   #25
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Default Re: 99 Saturn SL Electrical Nightmare?

The PCM doesn't send a signal to the CPS. It's a sensor, and input to the PCM, not an output. And the CPS doesn't send a signal to the ignition module on a '99. The CPS sends a signal to the PCM, which in turn controls the ignition module.

It might shed some light to ohm-measure all the CPSes the car has gone through, to see if any or all are really bad.
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Old 07-15-2011, 02:21 AM   #26
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Default Re: 99 Saturn SL Electrical Nightmare?

"The CPS sends a signal to the PCM, which in turn controls the ignition module"
Then it could be that the problem is the brain, rather than the CPS or ICM?
Is it hard to remove the PCM? Do they have codes or need to be be reset before installation? Will it just drop right in? I will try to get one from the junkyard.
I measured one of the CP sensors that I took off the car and it read over 980KΩ, which is only a little bit higher than the acceptable range.
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Old 07-15-2011, 09:44 AM   #27
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Default Re: 99 Saturn SL Electrical Nightmare?

While one replacement cps can fail unexpectedly, two more is a near impossibility. To answer your question about who makes the OEM cps and whether or not it makes any difference; I don't know and don't care as it does only one thing - make timing signals to turn on the pcm. Consider it an expensive door stop because they both work, period. The consistent descriptions of replacing the cps and the engine running for whatever time it does before it dies seems to elude almost everyone. While replacing the ignition coil didn't seem to answer the second most likely failure of spark, the fact that spark is lost again points back to things assumed and not checked.

Has it ever occurred to you that it may be possible for the cps harness to have an intermittent connection, wiring break, chafing to cause this spark/no spark condition? While nearly 100% of all spark related problems boil down to either cps or ignition control module replacement, no one has ever had a wiring issue. Perhaps there's a wiring issue with either the cps connection or the ignition control module. We rely on many assumptions and wiring is a large assumption that they're intact. You'll have to verify this one wire at a time.
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Old 07-15-2011, 09:55 AM   #28
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Default Re: 99 Saturn SL Electrical Nightmare?

Before chasing wiring from the CPS to the PCM and from the PCM to the ICM, and that is the signal path. Replace the ICM which you have yet to do.

Do not start replacing PCMs as they are not plug and play and they do not fail.

The CPS and ICM connector are possible suspects. Disconnect the connection and looking into the face of each connector verify that the individual connectors are at he same depth in each. Clean them out with CRC QD-Electronic Connection cleaner. Do not apply any grease into either of these connectors.
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Old 07-16-2011, 10:35 AM   #29
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Default Re: 99 Saturn SL Electrical Nightmare?

good question is the cps FULLY SEATED in the hole? theres an o ring that pops after jamming in there hard. its abit trouble to see if its properly seated....
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Old 07-16-2011, 11:08 AM   #30
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Default Re: 99 Saturn SL Electrical Nightmare?

A light and inspection mirror helps a whole lot in seating the CKP(CPS).
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Old 07-21-2011, 07:28 PM   #31
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Default Re: 99 Saturn SL Electrical Nightmare?

How's this for a conundrum:
I put the original ICM/coil pack back in, after shining the towers with steel wool and spraying the contacts on the harness and the ICM; changed yet another CPS (even though the reading with the multimeter was telling me it was still good) and started the car. It sparked to life on the first try! It runs great now; drove it around the block, let it idle for a while, revved the engine, turned it off, back on again, and everything is great.


I'm hoping this time it will run longer than two days.
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Old 07-21-2011, 10:50 PM   #32
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Default Re: 99 Saturn SL Electrical Nightmare?

There is some serious FM in the ICM and if the connector is not 100% it does not work correctly.

You may have it fixed this time.
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Old 07-25-2011, 01:32 PM   #33
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Default Re: 99 Saturn SL Electrical Nightmare?

It's still running!
Been driving it for the past 4 days with no sign of trouble. The "check engine light" came on a couple of times, but I'm sure that's a different thing altogether.

Thank you to all who contributed a reply to my post. I still don't know what was wrong, or what I did this time that made it run fine, but I hope I'll be trouble-free for a while.
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