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Codes by Knight_Rider
Started on: 08-26-2002 07:40 PM
Replies: 5
Last post by: Knight_Rider on 08-27-2002 09:23 AM
Knight_Rider
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Report this Post08-26-2002 07:40 PM Click Here to See the Profile for Knight_RiderSend a Private Message to Knight_RiderDirect Link to This Post
Ok... This is going to seem like the must newbie question to you guys and you will probably laugh but I realy need to know. What exactly are codes, how do you know when you have a particular code and how do you deal with the code shown. Can someone please explain because I don't have a manuel, or any type repair manuel so I have no idea. I am currently trying to get hold of a haynes manuel for future reference.
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Knight_Rider
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Report this Post08-26-2002 08:20 PM Click Here to See the Profile for Knight_RiderSend a Private Message to Knight_RiderDirect Link to This Post
Comeon guys I know all you must know the answer. There was a point many years ago when you would have no idea about this either.
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nyte2000
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Report this Post08-26-2002 08:59 PM Click Here to See the Profile for nyte2000Send a Private Message to nyte2000Direct Link to This Post
There are so many codes and each code can have a different combination of things attached to it ( mechanical or eletrical ). the first code is 12. When the proper terminals are jumpered the service engine soon light will flash code 12 three times. like this....flash......falshflash.......flash......flashflash......Flash.....flashflash. Then if any codes are stored then it will tell you afterwards. Maybe someone here can guide you to a possible link that may explain the codes and what are attached to them or you can buy a manual hehehe.
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84Bill
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Report this Post08-26-2002 11:01 PM Click Here to See the Profile for 84BillClick Here to visit 84Bill's HomePageSend a Private Message to 84BillDirect Link to This Post
Codes are "fault indicators"
The ECM monitors and controls the engine through various sensors and adjusts various things to maintain proper emissions levels. The ECM knows each sensors "normal range" and when a sensor or condition exceeds the given range the ECM logs the error and iluminates the "Check Engine" light.
Each sensor is given a code and certian conditions are given codes as well.

For example If an O2 sensor were to get coated with soot it will not be able to transmit accurate O2 levels in the exhaust. The mixture of air and fuel that goes into the engine will not be accurate either.
The ECM controls the Fuel/Air ratio by controlling the "Pulse width" of the injector. There is a max pulse range and a min pulse range stored into the ECMs memory for a given set of conditions (throttle position, air temp, engine load, vehicle speed, engine temp, ect ect ect). The ECM will try to bring the O2 levels back into a normal range by adjusting the (pulse width) mixture. Once the ECM reaches a point where it can no longer adjust the mixture to maintain proper O2 levels, the ECM sets a code and turns on the "idiot light" on the instrument panel.

Simple, huh?

The ECMs in our cars handle only a handfull of engine parameters compared to ones in newer cars. Our cars have only 1 ECM while newer cars have several and they can comunicate with each other to boot.

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Jeff of NC
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Report this Post08-26-2002 11:29 PM Click Here to See the Profile for Jeff of NCSend a Private Message to Jeff of NCDirect Link to This Post
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Knight_Rider
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Report this Post08-27-2002 09:23 AM Click Here to See the Profile for Knight_RiderSend a Private Message to Knight_RiderDirect Link to This Post
Ok thanks for that. It is simple once you put it into perspective.
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