Yes, a 1995 Jeep Grand Cherokee does have OBD2. All 1996 and newer model year cars and light trucks sold in the United States are required to be OBD2 compliant. However, since the 1995 Grand Cherokee was manufactured before the 1996 mandate, some models may have OBD2 while others may have the earlier OBD1 system. The easiest way to determine if your 1995 Jeep Grand Cherokee has OBD2 is to look for the diagnostic connector. The OBD2 connector is typically located under the dashboard on the driver’s side. It’s a trapezoidal-shaped connector with 16 pins.
If you’re still unsure, you can check your vehicle’s owner’s manual or contact a Jeep dealership. They will be able to tell you for certain which system your vehicle uses. Another clue can be the presence of a “Check Engine” light. While not a definitive indicator, vehicles with OBD2 typically have a consistently illuminated Check Engine Light.
While your 1995 Jeep Grand Cherokee might have OBD2, keep in mind that the system might not be as comprehensive as those found in later models. Early OBD2 systems sometimes had limited diagnostic capabilities.
Addressing potential injector issues in a 1995 Jeep Grand Cherokee can sometimes be tricky. Before diving into diagnostics, if you recently had work done on the injectors, allow the computer some time to learn and adjust. It can take up to 50 start cycles for the system to fully adapt.
If you are experiencing symptoms like rough idling or poor performance, checking the injector harness is a good starting point. Use a voltmeter to verify the presence of a 12-volt signal at each injector connector with the ignition on. Voltage significantly lower than 12 volts can point to a problem within the harness itself, such as bad splices which were a known issue in some earlier Jeep models.
The negative side of the injector circuit can be tested using an ohmmeter to check for continuity between each injector and the corresponding pin on the Powertrain Control Module (PCM). Finding the specific pinouts for your PCM will require consulting a wiring diagram specific to the 1995 Jeep Grand Cherokee.
While an injector tester can be a helpful diagnostic tool, remember that it might not catch subtle voltage drops in the harness that could still be causing problems. A thorough voltage and resistance check is always recommended for accurate diagnosis. Remember to consult a reliable repair manual for your specific model year when working on your vehicle’s electrical system. This will provide essential information like wiring diagrams, connector pinouts, and component locations.
