You have to take it to a truck repair shot or dealership. The fault codes can only be read with software and a special adapter to link up to a computer.
Hook up a laptop with the appropriate software to read Cat fault codes.
In order to find instructions on how to read the fault codes of a 2000 Freightliner FLD 112 with a C12 engine you should go to heavydutypowertrain.com where they have an extensive selection of instructional material including how-to videos.
If you have the Detroit motor, you can read the fault codes off the dash. Call them in to any Freightliner dealer or Detroit Diesel mechanic, and they can tell you what those codes are. If you have the MBE4000, Cummins, or Caterpillar motors, you'll need to have the computer hooked up to read off the codes.
Your ECU has registered a fault code. You need to get them read by a codereader to find the fault.
What you're describing appears to be an ignition problem. If that's the case, the computer will have detected it and has stored a "fault code" that you can read. Borrow, rent or buy a code scanner and read the fault code.
You need a scan tool to read fault codes.
Turn on the switch, and hold the override switch. Count the number of flashes for the first number of fault, then wait for a pause in the flash, then count the number of flashes for the second digit in the fault. Count the number of flashes until it cycles back around. Examples of codes would be 2 yellow or red flashes, then a pause, then 5 yellow or red flashes then a pause would be a code 25
The "Check Engine" light means that the computer has stored a fault code. You need to use a code scanner to read the fault code. Code scanners can be borrowed, rented or purchased at most auto parts retail stores.
A person can read the fault codes on a Hyundai Sonata by connecting an OBD II code reader to the vehicle's computer. It displays all the errors detected, as well as a brief description.
Jumper wire between te1 and e1 terminals ,binary code reads out as flashes on engine fault light.
Trouble code P0700 means: Read Fault Memory of Control Unit ETC
The light is only a signal that some event has posted a Code in the vehicles computer storage. Until you read the code with a Scan Tool, you will not know what the Fault was. Your Dealer, Mechanic, or an AutoZone Store will read the Code for you. The AutoZone will read it for FREE.