How to Read OBD1 Automobile Diagnostic Codes Step 2 To. finding electric problems in a car can be challenging. It is very difficult to trace one of the hundreds of wires in a vehicle. You need a specialized electric automotive repair shop to find most electric problems in a vehicleget your ehicle to display the OBD1 codes to you you have to connect to the service connector. Some cars may have them under the hood along the firewall, somewhere under the dash or else where. In OBD1 Hondas, the drive indicator "D" will flash in a similar way to represent the trouble codes for the transmisson system. Step 4 Once you have all of the codes that have been reported to you, you will need to research them. Auto delaerships, auto repair shops, auto parts stores, repair manuals and the internet are all good places to research the meaning and possible solutions to the car problems reported by the diagnostic codes. Automobile Onboard Diagnostics systems are designed to identify problem components in vehicles and report them to you through indicators or codes. At this time your check engine light will begin to flash. Using your repair manual or some internet research to determine the location of your connector. For example, on OBD1 Hondas, you could use a paperclip to jump the two wires in the service connector Things You Will Need you may need a paperclip and some basic hand tools depending on where your OBD1 connector is located. http://www.infobarrel.com/How_to_Read_OBD1_Automobile_Diagnostic_Codes Step 1 Once you are sure your car is equiped with an OBD1 system, you will need to identify where your port or service connector is located. Turn your ignition to the on position and record the codes displayed to you on your instrument panel. Add these numbers together to get the code the system is reporting to you. You do not want to start the car, but just get it to the on position so that the electrical systems are powered. With OBD1, this is generally done by jumping the wires and reading the flashes on a dashboard indicator. Once you have identified the location and have access to it, you are ready to proceed. Have a pencil and paper handy to write down your codes when reading them. Step 3Once you have successfully jumped the service connector, turn the car ignition to the on position. if you are handy you can probably replace the battery and or automotive electrical repairs alternator in your car. The problem is that the problem with your vehicle might not be caused by the battery or the alternator! It might be a short in a wire, a bad ground or just a sticky relay that causes the battery to drain or the alternator to not charge the battery. That is why there are professional auto repair shops! OBD1 codes are represented by a series of long and short flashes; long flashes represent the number 10, short flashes represent the number 1. OBD1, the first generation of these