97 SC Camshaft Sensor Code - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-23-2005, 01:26 PM   #1
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Default 97 SC Camshaft Sensor Code

After changing water pump etc. Drove the car a couple hours everything seems great.

Friday night go to take the car to the store and I get a SES light. Camshaft sensor code. Checked the FSM'* and most likely it had to do with me there.

Anyone have experience and or ideas besides get back in there and check wiring? I assum I either pinched a wire or hit it with the TA mount. Either way I guess I'm going back in from the wheel well to see what'* going on. This is the sensor that is actually located on the crankshaft correct?

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Old 10-23-2005, 01:29 PM   #2
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When you pulled the Water Pump pulley you should have seen the sensor on the left of the timming cover... That would be the Cam Sensor...

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Old 10-24-2005, 11:08 AM   #3
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Great.. thanks now I can see if it came unplugged or anything.

Let'* just say that the car ran beautifully while having the issue all through bfest!
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Old 10-24-2005, 12:12 PM   #4
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Quote:
Originally Posted by BillBoost37
Let'* just say that the car ran beautifully while having the issue all through bfest!
i FULLLLY agree
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Old 10-24-2005, 12:58 PM   #5
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I'll dig out the FSMs when I get home for you so we can locate and diagnose.
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Old 10-24-2005, 07:56 PM   #6
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Camshaft Sensor located behind water pump pulley. 3-Way F Metri-Pack Connector
Pin out: A - CMP Sensor Signal
B - Sensor Ground
C - 10 volt reference
Bill, you mentioned that you may have splashed it with coolant. I'd pull the connector off to check for any evidence of moisture. Could be grounded CMP signal, or grounded 10 volt ref. I think you should see that 10 volt reference with ign on, engine off. Just shooting out ideas here. I'll try to do some reading up on diagnostics.
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Old 10-24-2005, 07:59 PM   #7
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Quote:
Originally Posted by 1993 SLE
Quote:
Originally Posted by BillBoost37
Let'* just say that the car ran beautifully while having the issue all through bfest!
i FULLLLY agree
me too
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Old 10-25-2005, 11:19 AM   #8
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Mark..I was totally with you.

I picked up the manuals from Randy and determined the location from some of the connector pictures in the back of the book. These are more helpful than the locator pictures that only give a rough idea.

The connector is located at the bottom left side of the waterpump pulley and can be felt with a well placed finger or two.

My finger felt something loose. I gently (using two fingers) checked position and slid the connector back onto the sensor. Quick trip to Advance for a clearing of the codes, I am back in business w/o a check engine light. Didn't have to take anything off the car to fix it.

Thanks to all that jumped in to help out.
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Old 10-25-2005, 05:43 PM   #9
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Glad to hear you got that thing resolved, good work Bill. The actual sensor is located close proximity to the cam shaft sprocket, which I guess is close to the water pump pulley. Also, you probably already know this, but in the absence of CMP sensor input to the PCM, the Fuel Injection system will default to the calculated Sequential Mode and set a DTC. I'm guessing that this mode is a degraded mode of operation. Normally with correct CMP sensor input, the PCM is able to calculate true Sequential Fuel Injection (SFI). Alright, schools out, I'm taking a nap.
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Old 10-25-2005, 07:29 PM   #10
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Quote:
Originally Posted by markwb
Glad to hear you got that thing resolved, good work Bill. The actual sensor is located close proximity to the cam shaft sprocket, which I guess is close to the water pump pulley. Also, you probably already know this, but in the absence of CMP sensor input to the PCM, the Fuel Injection system will default to the calculated Sequential Mode and set a DTC. I'm guessing that this mode is a degraded mode of operation. Normally with correct CMP sensor input, the PCM is able to calculate true Sequential Fuel Injection (SFI). Alright, schools out, I'm taking a nap.
Very true... what it does is uses the last known reference for the Fuel Injection calibration... and it is degreded at that...

In the past we have seen people dissconnect the battery with a problem as such and wonder why the car ran sooo crappy... If there is no signal from the Cam sensor the PCM will never find #1 TDC which it uses for true SFI...

Glad you got it fixed, and that it was an easy problem Bill...

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