I have a 2002 Saturn SL2 Automatic that will crank but will not start. It’s been running good and then when I went to start it the other day it would only crank. No security light is on (even while cranking). I have verified I have no spark to my plugs by grounding them to the car and having them plugged into the wire- I also used a spark plug tester. In addition, I believe I have no fuel because my spark plugs are bone dry after pumping and cranking.
I have replaced the crankshaft position sensor and verified that the old one was reading 800ohms. I have also replaced the coolant temp sensor and that did not make a change. I have checked all my fuses and they all seem to be okay. The car is not throwing any codes either. It used to say camshaft position sensor (P0341) and heater control circuit low (P0037). My current thought is, that something is shutting off the injector pulse and spark at the same time. Any thoughts or ideas would be much appreciated!!

 

Sounds like a CKP failure but.....

Does the security light come on when you just turn the key to on, as part of the dash bulb check?
If it doesn't, then the bulb's burned out and it may be a passlock issue.

 

Hi Derf,
yes the security light comes on with the bulb check and then goes away. I replaced the crankshaft sensor and the wires have good voltage. Is there any other way I should be checking to make sure the PCM is getting the signal? Thanks!

 

I have replaced the crankshaft position sensor and verified that the old one was reading 800ohms. I have also replaced the coolant temp sensor and that did not make a change. I have checked all my fuses and they all seem to be okay.
I did pull the ICM connector off and found that the black/white wire is only reading around 1-4 volts when the ground is placed on the battery ground (I’m very new to using a volt meter).

 

What do you mean when you say the wires have good voltage? Are you looking at DC voltage? AC voltage? There should be no voltage when the engine is not rotating.

Please advise

 

I was checking for DC voltage on the wires with the key turned on. Mainly on the 6 pin connector for the ICM. I did check the wires on the crankshaft position sensor with the key on and they read 1.5V. The Ohms from the PCM where the crankshaft sensor plugs in is reading 968ohms from the PCM to the CKP.

 

The CKP generates a pulse output each time a special part attached to the crankshaft passes by the end of the CKP. It is a magnetic interaction that generates electricity in the coil which is inside the CKP. I'm not aware of that pulsed signal riding on a DC voltage but then again I never checked. I don't believe it is a grounded sensor from looking at schematics where it enters the PCM but again they may have left that detail out. I was looking for a continuity check to the PCM and since you're measuring resistance and not open circuit we know it is not open circuit. However that resistance is pretty high if my memory serves me correctly. Obviously the resistance of the wires are included. Did you miss your the resistance of the new one at the pins of the sensor itself before you put it in?

Also, be sure to go and pull all of the fuses labeled IGN as an ignition I think there are four there are definitely three. Don't just measure with the fuse plugged in. Also look for corrosion where those fuses plug into the fuse box, as the vehicle will not start if any one of those circuits is not closed.

I don't recall if a bad ICM will inhibit fuel but I do not think so.. when it is dark outside, open the hood and pull off the ends of the spark plug wires that attached to the ignition coils. Make sure you don't mix up which one goes to where. Have someone crank the engine. You should see alternating arcs between the two posts on each coil pack. Report back what you see for both IGN fuses and the coil test

 

When I put the new sensor in I did not test it. I can though!
Just did it. All IGN fuses check out fine. I performed the coil test in the dark and saw zero arcing.

 

Did you run a scan to check for codes? I suspect the coil pack if it was got voltage delivered.

 

hi Dude,
yes scan check is saying no codes.