The 1995 Jeep Cherokee does not have OBDII systems. OBDII systems became mandatory for all vehicles sold in the United States starting in the 1996 model year. While your 1995 Cherokee might have some diagnostic capabilities, it won’t utilize the standardized OBDII connector or protocols.
If you’re experiencing issues with your 1995 Cherokee, you’ll likely need to use model-specific diagnostic procedures. This might involve checking for trouble codes using a specific code reader designed for Chrysler vehicles of that era. For example, if you recently replaced your fuel injectors and a code hasn’t cleared, it’s important to remember that the computer system in a 1995 Cherokee may take several more start cycles to clear the code. This can sometimes require up to 50 starts.
Troubleshooting a 1995 Cherokee often involves manual checks. One common area to investigate is the wiring harness, particularly if you suspect a problem with the fuel injectors. Using a voltmeter, you can check the positive 12-volt signal at each injector plug with the ignition on. Each injector should read approximately 12 volts. The positive signal originates from either the distributor or the coil plug and is split off through various splices in the harness. Issues with these splices have been known to occur in some Jeep models.
You can also check the negative line of each injector leading to the Powertrain Control Unit (PCU) using an ohmmeter. If you need a wiring diagram or pinout information for the PCU, consulting a 1995 Cherokee service manual is recommended.
While an injector tester can be a helpful tool, keep in mind that it might not always detect a voltage drop in the harness that’s sufficient to cause problems. A thorough voltage check with a voltmeter is always a good practice.
