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How do you reset the computer on a 1999 Jeep Cherokee?

How do you reset the computer on a 1999 Jeep Cherokee?

  1. Disconnect the battery by removing the positive battery cable.
  2. Ground the positive cable to the negative cable for 30 seconds to erase the electric charge in the capacitors.
  3. Reconnect the positive cable to the battery.
  4. Turn the key to on but do not start.
  5. Turn the headlights on.
  6. Turn the headlights off.

How do you reset the PCM on a Jeep Grand Cherokee?

Jeep Cherokee and Jeep Grand Cherokee 1984-2004: How to Reset ECU

  1. Step 1 – Prepare to reset the ECU.
  2. Step 2 – Disconnect the battery.
  3. Step 3 – Ground positive cable to the negative cable.
  4. Step 4 – Reconnect the battery.
  5. Step 5 – Turn the headlights on and then off.
  6. Step 6 – Turn key to the “OFF” position.

What is the PCM on a Jeep?

The Powertrain Control Module (PCM) is the computer that controls most of your Jeep’s essential systems. The PCM controls the engine timing, the fuel to air ratio, the transmission, and the anti-lock brakes, along with dozens of other smaller functions.

How do you clear the codes on a Jeep Cherokee?

How to Reset the Fault Code on a Jeep Cherokee

  1. Pull the release lever to open the hood from inside the vehicle.
  2. Open the hood and place the support rod into position to prop up the hood.
  3. Remove the nut connecting the negative battery terminal to the battery, using an open end wrench.
  4. Allow the computer to reset.

How do you reset the transmission on a Jeep Grand Cherokee?

Reset Automatic TransmissionTransmission Adaptation

  1. Press the gas pedal down and keep it pressed.
  2. Turn ignition on without starting the engine.
  3. Keep ignition on (engine off) and the gas pedal pressed for thirty seconds.
  4. Turn the ignition off.
  5. Release the gas pedal.

How do I know if my Jeep needs a computer reset?

When it detects a malfunction in any of the vehicle’s systems, it will alert you with a warning light on the instrument panel. It will also let you know when your Jeep needs regular servicing. After you have had the repairs or servicing done, you or your mechanic will need to reset the computer to keep it functioning properly.

What does the PCM do on a Jeep Cherokee?

The PCM (power train control module) or computer controls the Cherokee’s ignition, fuel system, emission and other systems. When it detects a malfunction in any of the vehicle’s systems, it will alert you with a warning light on the instrument panel. It will also let you know when your Jeep needs regular servicing.

How do you reset the computer after a car is serviced?

After you have had the repairs or servicing done, you or your mechanic will need to reset the computer to keep it functioning properly. Find the Data Link Connector port next to the fuse panel under the driver’s dashboard. Plug the computerized scan tool into this port.

How do I clear the error code on my computer?

Disconnect the negative battery cable and leave it disconnected overnight. Reconnect the negative battery cable in the morning and all but any hard codes will be cleared. By disconnecting the battery, you are essentially giving the computer a form of amnesia, whereby the computer forgets any stored codes.