My '99 Cherokee's Check Engine Light Is on and the Cruise Is Jerky
The 1999 Jeep Cherokee was available in both two- and four-wheel-drive drivetrains. It came equipped with either a 2.5-liter in-line four-cylinder engine or a 4.0-liter V-6 engine, based on the model package. The 1999 Cherokee uses an onboard diagnostic computer called an OBD-II control computer to collect data from several sensors on the Jeep. If your "Check Engine" light is on and you are having intermittent cruise control issues, an OBD-II scan of the vehicle is needed. The cruise control system does create OBD-II codes that will cause the "Check Engine" light to illuminate.
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Instructions
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Open the driver's door of the Cherokee. Locate the OBD-II scanner port below the driver's side dashboard. The port is identical in shape to the plug end on your OBD-II scanner. Plug the scanner into the port. Turn the ignition key to the "II" accessories position without starting the Jeep. Press the power button on your scanner to boot it, if needed.
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Use the "Up" and "Down" arrow keys on the scanner to select your vehicle's year, make and model. Select "Read Codes" or "Read Trouble Codes" from the scanner menu. Use the "Read" or "OK" button on the scanner keypad to accept your answers. Allow the scanner to communicate with the Jeep.
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Read the OBD-II codes provided by the scanner. Use the code definition on your scanner to help diagnose and repair the vehicle. The scanner will give you either a generic definition or a complete definition and repair information, depending upon your scanner's quality.
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Tips & Warnings
OBD-II codes P0565 or P0566 are generic codes that could indicate a faulty on or off signal in the cruise control system. If you receive any code P0575 through P0580 sequentially, this indicates that there is also an issue in the cruise control system. These codes are generic, and proper electrical, mechanical and vacuum testing will be needed to determine the problem. Some software manufacturers offer a system that allows you to connect your OBD-II-equipped vehicle directly to your laptop computer. These hardware and software packages allow you to perform diagnostics on your vehicle, and they provide a more in-depth definition of OBD-II related issues. For the advanced mechanic, some of these packages allow you to make adjustments to certain engine systems.
Never erase OBD-II trouble codes without making the proper repairs.
