Re: 2002 ranger no start
Lets start here.
There are several factors that can cause non-communications. Some of the most common causes are:
o Damaged Data Link Connector (DLC): The data link connector (DLC) is damaged or has been tampered with and the connection to the on-board diagnostic (OBD) computer is not possible. For example, the DLC may be broken or melted, the DLC is used to power up an accessory, or something is plugged into the DLC.
o Blown Fuse: If the vehicle fails to communicate, check the fuses for the cigarette lighter. On most vehicle makes and models, the system on the vehicle that communicates with the test equipment gets its power from the same circuit as the cigarette lighter. If the cigarette lighter fuse is burned out, the vehicle will not communicate with the test equipment during the OBD inspection. The fuse is faulty if it is dark inside like the inside of a blown light bulb or if the electrical wires within the fuse are burnt apart and not connected.
o Improperly Installed Aftermarket Systems: Some installers of aftermarket systems, such as radios, security systems, navigation systems, etc. are tapping into the wiring harness of the DLC, or OBD port to power the radio or other aftermarket devices. This is considered tampering and may cause the vehicle to be unable to establish communication with the test equipment during the OBD inspection..
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