Service engine soon light - Page 2 - 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 03-22-2006, 12:20 AM   #11
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Quote:
Originally Posted by vital49
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Which car? SES and CE lights are one in the same.
92 SSEi. No, the SES, and CE lights are not one in the same on this car.

The check engine light is on the DIC. The SES light is over by the Security light. The SES light stays on while the car is running. The CE light only comes on when you start the car, then goes off with all other system monitor lights on the DIC.

Maybe a picture is in order....
The DIC has a Check Engine light? Are you talking about the engine icon looking thing? The only time I ever see that on is when the key is on, engine off, oh, and when I was low on oil once. Is that what you are talking about?

Rotating the TPS all the way will give you a code for high or low TPS signal.
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Old 03-22-2006, 09:31 AM   #12
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Quote:
Originally Posted by J Wikoff
Quote:
Originally Posted by vital49
Quote:
Originally Posted by J Wikoff
Which car? SES and CE lights are one in the same.
92 SSEi. No, the SES, and CE lights are not one in the same on this car.

The check engine light is on the DIC. The SES light is over by the Security light. The SES light stays on while the car is running. The CE light only comes on when you start the car, then goes off with all other system monitor lights on the DIC.

Maybe a picture is in order....
The DIC has a Check Engine light? Are you talking about the engine icon looking thing? The only time I ever see that on is when the key is on, engine off, oh, and when I was low on oil once. Is that what you are talking about?

Rotating the TPS all the way will give you a code for high or low TPS signal.
Yes, that is the light I'm talking about.

Is the TPS supposed to be dead center? That how I had it before.

I'll test it again when I get home tonight.
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Old 03-22-2006, 09:40 AM   #13
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TPS should be hooked behind the pin, so the arm moves when the throttle is advanced.

The curved face of the arm should be in contact with the throttle shaft pin. Ignore code 58. It'* a known bug in the 92 PCM.
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Old 03-22-2006, 09:49 AM   #14
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Quote:
Originally Posted by willwren
TPS should be hooked behind the pin, so the arm moves when the throttle is advanced.

The curved face of the arm should be in contact with the throttle shaft pin. Ignore code 58. It'* a known bug in the 92 PCM.
Yes, that'* exactly how I have it now, just the entire assembly is on a slight angle. I'm thinking that would get rid of my code 22. If not, I'll move it back to center. If that doesn't work, maybe it'* time for a new TPS.
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Old 03-22-2006, 09:51 PM   #15
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Update....

I couldn't get the Code 22 to go away. So, I checked the voltage at the harness. 4.98 volts. Perfect.

So, I then tried to test the TPS according to the procedure in the Chiltons. It seemed to not pass the test. So, I bought a new TPS. Installed it. Took the battery cable off for 20 minutes. Before I even started it, I pulled codes. Had the code 22 again. Test drove it. The light was coming on/going off intermittenly. Seemed to go off when I pressed the gas.

Repulled codes. Still a 22. If there was a fault in the wiring, I would expect a 21 or 22. Not just a 22. Anyone, anyone?
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Old 03-23-2006, 09:09 AM   #16
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Bumpidy bump.....
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Old 03-23-2006, 09:14 AM   #17
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The book would probably suggest checking the connector and pins, looking over the wiring etc.
Also having recently thought I was the victim of an intermittant ground issue, I would suggest cleaning the grounds. (It'* actually easy, once you get to it).
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Old 03-23-2006, 09:22 AM   #18
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Quote:
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The book would probably suggest checking the connector and pins, looking over the wiring etc.
Also having recently thought I was the victim of an intermittant ground issue, I would suggest cleaning the grounds. (It'* actually easy, once you get to it).
Connector and pins are all in good shape. I have 5 volts at the harness.

The ground you're talking about....the one under the driver'* seat?
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Old 03-23-2006, 09:44 AM   #19
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In your case, yes..I would clean those grounds well. Actually along the drivers inner door sill. Knowing that the car had water leaks, that would be the first place to check. Then at the battery, under the coil pack, front of the motor where the battery cable is hooked up, then at the back of the motor by the oil pressure sender. (this last one is easiest to get to through the passenger wheel well.
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Old 03-23-2006, 09:50 AM   #20
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Does your voltage vary smoothly from .2-.7 volts at the bottom to about 4 volts at the top?

What effect does it have if you wiggle and shake the harness while checking voltage?

Inspect your pins on the harness. I'd rule out a pin problem on the new sensor.

Code 22 sets if the ignition is on and the TPS voltage is less than .2 volts for 4 seconds or more at any time.

Code 21 sets if TPS voltage is higher than 4.8 volts at any time.
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