First code 41, next 19 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-16-2007, 12:39 AM   #1
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Default First code 41, next 19

A little background info first.....
Around a 1 - 2 months ago I tried to start the car at work on my lunch and it didn't want to start on the first attempt. I thought this was kind of weird but didn't worry to much about it cause it started on the second attempt. The check engine light was on but I disregarded it cause I thought it was my usual 2 codes, 21 & 58
About a week later I hooked up the scan tool and found out that it was code 41.

Currently.....
Yesterday I was out for a little drive and stopped for something to eat. When I came back to start the car a few minutes later it didn't want to start.
It would crank but didn't want to catch, so I held my foot on the throttle to help it along.
I got it started and made it home. I read the codes and found 41 & 19.

After doing some reading on Mitchell and printouts I started testing.

I pulled the sensor and looked in the hole for the magnet, I don't exactly know what a good one is supposed to look like, but it looked like it was still intact. It had some funny residue on it that I couldn't wipe off with a rag almost like burnt plastic.
On the back of the sensor it had slight scratches on the plastic but nothing to deep.
I don't know what a good magnet is supposed to look like.
Does anyone have any pics of a good one vs. a broken ?

From my reading, I know that code 41 is a Cam sensor error and I know that 19/18 is a Crank sensor error. I'm also aware the the 2 sensors are linked together on the same circuit.
What are the chances that the bad Cam sensor is causing the Crank sensor error OR do I have 2 different problems ?

While I was testing I found something that was odd to me.
I was testing the Cam sensor signal wire at the PCM (plug B pin A12 Black wire) with the Key on Engine off and the voltage was only something like 2.5v but when I test the wire at the Ignition coil it shows 5 volts.
Any ideas about the different voltages on the same wire ? According to my diagram it goes from the coil pack the the PCM ?

Any help or suggestions would be great,
Thanks in Advance,
Dutch
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Old 06-16-2007, 07:24 AM   #2
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Dutch..if you found a magnet in the cam gear and not an empty hole..then you are all set. It'* a magnet or no magnet situation.
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Old 06-16-2007, 08:25 AM   #3
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Boost or anyone else....
Do you have any idea about why I'm getting different voltage readings on the Cam signal output wire from the coil or why I'm getting code 19/18 ?

Thanks,
Dutch
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Old 06-16-2007, 10:00 AM   #4
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This is the harness:
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Left side connects below the alternator. Bottom left is the cam sensor, next one to the right is the crank sensor, the far right is the ICM. The two sensors talk through each other. Check this harness carefully for abrasion damage.

This is the magnet properly installed:
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Note that it'* in a plastic carrier.

This is the back side (ignore the gray epoxy):
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The magnet is the little square in the middle of the plastic. Is this what you saw? You should have seen the plastic sticking out like the second pic above when you look through the sensor hole.
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Old 06-17-2007, 01:15 AM   #5
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Thanks a ton for the pics Will, they really help me to understand what I'm looking at.

I'm going to have to remove my sensor again and take a look at the magnet. I thought it was bigger than that (like the whole thing was a magnet).

I think that the plastic may have melted over it or something.
Like I said earlier it had a weird residue on it that I couldn't wipe off with a rag but it still looks circular so thats probably a good sign.

When I tested the pins of the Cam sensor harness the voltages were with in specs "Pins A-B 5 - 7 volts and B-C 8 -12 volts".

Any idea about why the voltage is different at the Coil Pack vs the PCM on the Black wire (Cam Signal Output from the ICM) ?
According to my wiring scematic this Black wire goes directly from the ICM to the PCM, without going through any sensors.
Isn't the voltage reading supposed to be the same anywere you check along this wire ?


Thanks again,
Dutch
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