Vehicle Control Module (VCM) Replacement/Programming

IMPORTANT: Disconnecting the VCM will not erase the Crankshaft Position (CKP) System Variation Learn as long as the ignition switch is in the OFF position.



REMOVAL PROCEDURE
1. Disconnect the negative battery cable.
2. Pull the spring retainer up and over the rail of the VCM. Slide the VCM out of the bracket at an angle.

VCM Harness Connections:

3. Remove the connectors from the VCM.
4. Remove the VCM access cover.




5. Gently pinch the retaining clip and pull upward to remove the Electronic Spark Control module/PROM.
6. Set the Electronic Spark Control module/PROM aside carefully.

NOTE: The Electronic Spark Control module/PROM will be reused in the replacement VCM.

7. Do not open the Electronic Spark Control module/PROM.
8. Remove the new VCM from the packaging. Check the service number in order to make sure the number matches the defective VCM's number.

INSTALLATION PROCEDURE

NOTICE: In order to prevent possible electrostatic discharge (ESD) damage to the VCM, do not touch the connector pins or soldered components on the circuit board.

IMPORTANT: Press only on the ends of the KS Calibration PROM. Gently press on the Knock Sensor (KS) Calibration PROM until it is firmly seated in the socket. Listen for the click.

1. Align the notches of the Electronic Spark Control module/PROM with the notches in the Electronic Spark Control module/PROM socket.
2. Install the Electronic Spark Control module/PROM in the Electronic Spark Control module/PROM socket.
3. Install the access cover on the VCM.
4. Install the VCM in the engine compartment.
5. Install the connectors to the VCM.
6. The MIL, antilock and brake lamps will continue to be enabled until the VCM is programmed. Once the programming is complete, the lamps will turn off and normal operation will occur.
7. Connect the negative battery cable.

VCM PROGRAMMING
1. Take the following steps in order to set-up for programming the VCM (EEPROM).
^ The battery is fully charged.
^ The ignition is ON.
^ The Data Link Connector (DLC) is secure.
2. Refer to an updated Techline terminal and follow the user's instructions for VCM programming.
3. If the VCM fails to program, do the following functions:
^ Check all the VCM connections.
^ Check the Techline terminal and equipment for the latest software version.
^ Try again to program the VCM. If the programming fails again, replace the VCM.
4. Perform the Vehicle Theft Deterrent (VTD) Password Learn Procedure. Refer to Password Learn Procedure.
5. Perform the CKP System Variation Learn Procedure. Refer to CKP System Variation Learn Procedure.
6. For a functional check, perform the Powertrain On-Board Diagnostic (OBD) System Check.