Determining whether your 1999 Dodge Durango uses OBD1 or OBD2 can be crucial for effective vehicle diagnostics and repair. Many Durango owners find themselves questioning which system their SUV employs when facing issues like engine starting problems or trouble retrieving diagnostic trouble codes (DTCs). Like the user of a 1997 Dodge Dakota who encountered starting issues and OBD-II communication failure, understanding your Durango’s diagnostic system is the first step in troubleshooting.
For the 1999 model year, the Dodge Durango falls squarely into the OBD2 era. OBD2, or On-Board Diagnostics II, became the standard for all cars sold in the United States starting in 1996. This system provides a standardized way to access vehicle health information, emission controls, and engine performance data. Unlike older OBD1 systems which were manufacturer-specific and less comprehensive, OBD2 offers a universal diagnostic language, making it easier for mechanics and DIYers to diagnose problems using standard scan tools.
If you’re experiencing issues connecting your scan tool to your 1999 Durango, similar to the Dakota owner’s “link error,” the problem likely isn’t OBD1 vs OBD2 confusion. Instead, consider these common culprits:
- Scan Tool Compatibility: Ensure your scan tool is indeed OBD2 compliant and known to work with Dodge vehicles. While OBD2 is a standard, some older or basic scanners might have compatibility limitations.
- Diagnostic Port Issues: Inspect the OBD2 port under your Durango’s dashboard for any damage or corrosion. A faulty port can prevent proper communication.
- PCM (Powertrain Control Module) Problems: The PCM is your Durango’s computer. If it’s malfunctioning, it might not communicate with the scan tool. The Dakota owner in the original post suspected a PCM issue due to the inability to connect with an OBD-II scanner.
- Wiring Problems: Issues in the wiring between the OBD2 port and the PCM can disrupt communication. Check for any frayed, broken, or shorted wires.
- Power and Ground Issues: The PCM and OBD2 port need proper power and ground to function. The Dakota owner checked voltages to the PCM, which is a good step. Ensure these connections are solid in your Durango as well.
It’s important to locate and inspect the OBD2 port, typically found under the dashboard on the driver’s side of your 1999 Dodge Durango.
While spark and fuel delivery are essential for starting, as highlighted by the Dakota owner’s investigation into spark quality and fuel pump function, a communication problem with the OBD2 system often points towards electrical or computer-related issues. If you’re confident your 1999 Durango is OBD2 compliant (which it should be), focus your diagnostic efforts on the potential causes of communication failure rather than questioning the OBD standard itself. Troubleshooting these electrical and computer aspects will likely be key to resolving both your diagnostic and starting problems.
