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Resetting a TJ ECM:
After making any sort of engine or drivetrain modification to a TJ you should clear the ECM's adaptive memory so the ECM will adapt or make the necessary changes for your modifications.
These need to be done in order:
1. Disconnect the positive cable and touch it to the negative battery post for 30 seconds.
2. Reconnect the positive cable.
3. Turn the ignition switch to the on position.
4. Turn the headlights on.
5. Turn the headlights off.
6. Turn the ignition switch to the off position.

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