Other newer cars and trucks may work the same. Make sure you buy the correct ALDL cable setup for your car or cars. You can buy an ALDL Cable with an OBD1 12 pin connector shell, or OBD2 style 16 pin connector shell, or a cable with just a bare male pin, to plug into your cars female connector serial data pin location (pin M or E or 9 on the diagrams above). The ALDL cable with the male OBD1 connector shell will allow you to just feel under the dash and plug the cable in. The cable with just the bare pin requires you to look under the dash and plug into the correct pin on the car side of the connector. If you have both 12 pin and 16 pin cars to diagnose and data log, you can buy just the bare pin USB cable, but is less convenient to use. Since we are looking at the connector pins, it should be mentioned here that a quick method to see which trouble code or codes are being set in your cars ECM is to jumper the A and B pins of the 12 pin ALDL OBD1 connector with a paper clip. While the car is off, sitting still, turn the ignition key forward while this jumper is in place. The Service Engine Soon ( SES ) light will flash in a repeating sequence, telling which trouble codes have been set in the ECM. LAPTOP CAR TUNING SOFTWARE MANUALĪ service manual for your year car will have a chart outlining what each trouble code stands for, or this Trouble Code website can be of help. This paper clip method will tell you the trouble code or codes set in your ECM, but it will not tell you what conditions the trouble code is being set under, or let you clear the trouble codes on the fly, as the ALDL cable and PC setup will. You will need a PC to run your scanning or diagnostic software, preferably a laptop PC. The hardware requirements for the PC are largely dictated by what scanning or diagnostic software you plan on running. Some of the scanning programs are very simple DOS based programs, others are more graphically intensive. Look at the software links we have posted and read the hardware requirements for the program you are thinking of using. For the most part, the simple DOS programs can be run on very old, 486 based laptops with very little memory ( <16MB ). The more advanced graphical scanning programs, such as TTS Datamaster and EFILive, still have very modest hardware requirements, requiring Windows 95 or newer, a 90Mhz or greater pentium CPU, and 32MB of RAM or greater.
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