Before Programming The Engine Control Module

NOTE:

DO NOT program a control module unless you are directed by a service procedure or you are directed by a service bulletin. Programming a control module at any other time will not permanently correct a customer's concern.

The following criteria must be met before performing the programming or learning procedure:

There are no charging system concerns. All charging system concerns must be repaired before programming a control module.
Battery voltage is between 12-16 V. The battery must be fully charged before programming the control module.
A battery charger is NOT connected to the vehicle battery. Incorrect system voltage or voltage fluctuations from a battery charger may affect programming or control module damage.
Note the engine oil life remaining percentage.
Turn OFF or disable any of the following systems that may put a load on the vehicle battery:
- Twilight sentinel
- Interior lights
- Daytime running lights
- HVAC systems
- Radio
- Engine cooling fans, etc
The ignition switch is in the proper position. The scan tool prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure, unless instructed to do so.
All of the following tool connections are secure:
- The connection at the data link connector (DLC)
- The voltage supply circuits

DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, the control module programming may be affected or control module damage may occur.