Control Module: Service and Repair

1. 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 TCM and has information on the transmission, shift map, etc. several others.

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

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

NOTICE: 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 TCM from passenger compartment:
- Switch OFF the ignition key.
- Remove connectors from TCM.
- Remove TCM from passenger compartment.
- 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.
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 MEMCAL until the clips are locked. Listen for the click.
5. Install TCM to passenger compartment:
- Install MEM-CAL access cover.
- Install TCM to passenger compartment.
- Connect TCM connectors.
- Do an IGNITION CYCLE and verify correct CHECK TRANS indicator operation.