Control Module: Service and Repair

MEM-CAL (Memory and Calibration Unit)
Information for specific Transmission and Vehicle is programmed using an integrated circuit called a MEM-CAL. This allows one model of controller to be used for many different Vehicles.

The MEM-CAL is located inside the Transmission Control Module (TCM) and has information on the Transmission, shift map, and several others.

MEM-CAL Replacement
If the diagnostic procedures require MEM-CAL replacement, the MEM-CAL should be replaced using the following procedures.

CAUTION: The Ignition must be "OFF", when disconnecting or reconnecting the TCM connector, to prevent internal damage to the TCM.

CAUTION: To prevent possible Electrostatic discharge damage to the TCM, do not touch the connector pins or soldered components on the circuit board.

MEM-CAL Replacement Procedure




1. Remove the TCM from driver compartment:
a. Switch "OFF" the Ignition key.
b. Remove connectors from TCM.
c. Remove the TCM from passenger compartment.
d. Remove MEM-CAL access cover.

NOTE: Do not remove any of the other screws.




2. Remove MEM-CAL from TCM.
- Using two fingers, pinch both retaining clips and remove MEM-CAL from the MEM-CAL socket.

CAUTION: Using unapproved MEM-CAL removal methods may cause damage to the MEM-CAL or socket.

3. Check new MEM-CAL.
- Check the part number of the new MEM-CAL to make sure it is the correct replacement part.

4. Install new MEM-CAL.




- Small notches in the MEM-CAL must be aligned with small notches in the MEM-CAL socket.




- Gently press down on the ends of the MEM-CAL until the clips are locked. Listen for the click.

5. Install TCM to passenger compartment:
a. Install MEM-CAL access cover.
b. Install TCM to passenger compartment.
c. Connect TCM connectors.
d. Do an Ignition Cycle and verify correct "CHECK TRANS" Indicator operation.