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#1
11-24-2003, 02:57 PM
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Service Engine Soon
My 1999 Suburban 1500 service engine soon light comes on when i am climbing up hill at a constant speed. it generally resets itself about 1 day later. Does anyone have some help for me?
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#2
11-25-2003, 05:20 AM
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Re: Service Engine Soon
When the PCM sees a problem with the emissions system or its componants..it sets a trouble code and turns on the MIL (SES light)...If you can pull the code (some auto parts stores will do this for free) we can give you some ideas on what is going on
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Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#5
12-02-2003, 09:29 AM
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Re: Service Engine Soon
'99 has OBD2 diagnostics and you can't pull a code simply by grounding the aldl terminals like the older GM's. It requires an OBD2 code scanner. Autozone normally will read your codes for free. Let us know what it says before you go buying any parts.
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#6
12-03-2003, 01:50 AM
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Re: Service Engine Soon
I bought an ODBII scanner. I was told by Kragen that a parts store got sued because they misdiagnosed a problem so they dont check codes anymore. Anyways I got mine on sale for 129.99 + a $30 rebate. So pretty much $100. Is that a good price?
ANYWAYS.... I got a P0446 Code - Evaporative Emnissions Control System Vent Malfunction. Ummm...Any help on this. I went off roading in some dunes a couple of days before I got the SES light.
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2000 Suburban 4x4 lifted 1989 Civic Sedan Mut Motor Turbo 1985 CRX Si Free - Project Car 1965 Chevelle SS - Some Day Project car (twin turbo V-8??!!)
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#7
12-03-2003, 06:35 AM
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Re: Service Engine Soon
Absolutely everything can and will cause a check engine light or SES light. From a loose gas cap (computer sees a pressure loss in the fuel tank) to a bad sensor or a bad computer (one that has no ability to make things happen or see fault codes the tech creates) , to a vacuum leak, a bad fuel pump, a bad spark plug, a plugged fuel filter or a broken, pinched or disconnected wire.
So when your check engine light or SES light comes on, the procedure is the same for all cars. Someone needs to pull the code, check the circuit, test a few sensors, see what’s going on and determine what it is the computer is really seeing and why it doesn’t like what it sees. I typically use a scanner to perform many of these tasks and the scanner will allow me to watch what’s going on. It will allow me to see what the coolant sensor, speed sensor, throttle position sensor is telling the computer. So as I watch the serial stream data, I should know if it is right or not. For instance, if I knew the engine was warmed up but I saw the coolant sensor was telling the computer the engine temperature was -40, I would know the connection at the coolant sensor was defective or the sensor was open. If I saw the coolant sensor was telling the computer the engine was 150F and I knew it was well over 220F, I would replace the sensor, clear the code and test drive the car to see if the code reset or the SES light came back on.
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