3. "Exchange EPROM"

This step is used to determine and program a programmable EPROM that is to be installed for DME 3.1 and 3.3 only. The programming procedure is divided into 2 steps.

Step 1 - "Determining EPROM"

The MODIC reads the data (chassis number, part number of the basic control module, and part number of the programmed control module) necessary for determining a replacement control module EPROM from the defective control module and will display the acceptable replacement part number(s)which need to be installed in that vehicle.

If automatic determination is not possible, the data may be read off the label of the defective control module and entered manually into the MODIC.

Step 2 - "Program EPROM"

The MODIC programs the newly installed EPROM with the aid of the data derived in step 1. The new control module label can be printed out by the MODIC station printer, or completed by hand. The MODIC programs the basic control module with the latest data.

An EPROM may only be programmed one time. It is possible however to install a new EPROM and program it.

This procedure takes approximately 3 minutes. Extensive help information is available by pressing the "C" key on the MODIC. This help information is only available when the "C" key is displayed.

Be advised that there may not be an EPROM for all control modules. If this is the case, a preprogrammed control module must be ordered.