Programming and Relearning

Electrically Erasable Programmable Read Only Memory (EEPROM)
The electrically erasable programmable read only memory (EEPROM) is a permanent memory chip that is physically soldered within the PCM. The EEPROM contains the program and the calibration information that the PCM needs to control powertrain operation.

Unlike the PROM used in past applications, the EEPROM is not replaceable. If the PCM is replaced, the new PCM will need to be programmed. Equipment containing the correct program and calibration for the vehicle is required to program the PCM.


EEPROM Programming

Reprogramming the PCM
Reprogramming of the PCM is done without removing it from the vehicle . This provides a flexible and cost-effective method of making changes in software calibrations. Refer to the latest Techline information on reprogramming or flashing procedures.

1. Set-up - Ensure that the following conditions have been met:
- The battery is fully charged.
- The ignition is "ON."
- The Vehicle Interface Module cable connection at the DLC is secure.

2. Program the PCM using the latest software matching the vehicle. Refer to up-to-date Techline equipment user's instructions.

3. If the PCM fails to program, proceed as follows:
- Ensure that all PCM connections are OK.
- Check the Techline equipment for the latest software version.
- Attempt to program the PCM. If the PCM still cannot be programmed properly, replace the PCM. The replacement PCM must be programmed.

Functional Check
1. Perform the On-Board Diagnostic System Check.
2. Start the engine and run for one minute.
3. Scan for DTCs using the Tech 2.