My 2002 Silverado has the Service Engine Soon light on constantly, but when I tried to download trouble codes, none came up. What gives? Is there a programming which will not tell you what is the problem?
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The following directions will help you decode your 2002-2006 Nissan Altima's Service Engine Soon (SES) light and reset it.<br />
<span style="font-weight: bold;">Obtain The Trouble Code</span><br />
<li>Turn the ignition key to the ON position and wait three seconds.</li>
<li>Put the accelerator pedal to the floor and release it five times in less than five seconds.</li>
<li>Wait exactly seven seconds. Put the accelerator pedal to the floor for ten seconds until the SES light flashes.</li>
<li>Release the accelerator pedal and start counting flashes to obtain the four-digit trouble code.<br /></li></ol>
<li>Long flashes (0.6 seconds) indicate the first digit of the code; count
the blinks one through nine and write down the first digit. (Ten blinks
indicates a zero.) </li>
The next three digits blink
faster (0.3 second) and have a 1 second pause between digits.</li>
<li>The ECM code repeats until you turn the ignition key to the OFF
<li>You can look up the trouble codes in the Service Manual.</li>
<li>If you get four blinks of ten, or 0000, the ECM indicates no malfunction.<br /></li></ul>
<br style="font-weight: bold;" /><span style="font-weight: bold;">Clear The Trouble Code</span><br />
Clear the code and the SES light by holding the
accelerator pedal down to the floor for 10 seconds or more while the SES light is
<li>When the pedal is released, the ECM will erase the trouble
The service engine light is on because the built in onboard diagnostic system it trying to tell you that it has diagnosed a problem and stored it as a trouble code in the vehicles computer. Disconnecting the battery wont make it go away. You should get the codes read, and the code reader can reset the light, but if the problem is still there the light will come back on pretty soon. Most major auto parts stores will read these codes for you for no charge. Write down the code that is in your trucks computer so you will know what the computer logged as trouble.
The computer or ECM constantly tests operation of all sensors and
When any of the sensor signals is missing or out of normal range, the
ECM sets a fault and illuminates the "Check Engine" or "Service Engine
Soon" light also called MIL (Malfunction Indication Light)
storing the corresponding Diagnostic Trouble Code (DTC) in the ECM
The same happens if a mechanical component of controlled system fails.
For example, mechanical problem inside the transmission also can turn
the "check engine" light on. Even not properly closed gas cap will cause
the "check engine" light to come on - the ECM constantly checks if the
gas tank is sealed properly.
To sum up, when the "Check Engine" or "Service Engine Soon" light comes
on and stays on, there is a problem with your vehicle. This could be a
problem with the engine, transmission, or some emission-related
component or system.
The stored trouble code can be retrieved with the special scan tool by
the technician. The code itself does not tell exactly which part to
replace, it only gives a direction where to look for - the technician
has to perform certain tests specific for each code to find the exact
cause of the problem.
Scanning for knowed exactly what fault code you have there.
one is service engine soon referring to the engine and trans. systems, and one is service vehicle soon, referring to body, abs, hvac, etc. systems two different lights for 2 different types of trouble codes
Why my Check Engine/Service/Check Engines Soon light comes on? The engine computer or PCM/ECM All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions. The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.
without knowing the trouble code that is set in memory anytime the check engine light comes on there is no way to know the problem or if there is a fix under any type of recall, there are over 200 fault codes poss in this system, have it tested for which code turned the light on.
you might try unhooking the battiey for 20min both + and - posties cuz that will force the computor to have to resest only if you have addressied the fuel pressure problem which taht would most likly be your filter which isn't all that much