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: To prevent internal VCM damage, the ignition must be turned OFF before disconnecting or reconnecting power to the VCM (for example, battery cable, VCM fuse, jumper cables, etc.).
Important: When replacing the production VCM with a service VCM (controller), it is important to transfer the broadcast code and production VCM number to the service VCM label. This will allow positive identification of VCM parts throughout the service life of the vehicle.
Service of the VCM consists of either replacement of the VCM or reprogramming of the VCM. If the diagnostics call for replacement of the VCM, it will be necessary to transfer the Elecronic Spark Control Module (PROM) and program the VCM using the procedure in this section.
Removal Procedure
Important:
• The PROM/Electronic Spark Control Module must be transferred to
the replacement VCM. • Do not remove the cover of the PROM. Use of an unapproved PROM
removal method may cause damage to the PROM or the socket. • The replacement VCM must be programmed before the vehicle will
run. • The replacement VCM must also have the CKP System Variation Learn
Procedure completed. If this procedure is not completed a DTC P1336 will set.
- Disconnect the negative battery cable.
- Remove the connectors from the VCM.
- Remove the spring retainer off the edge of the VCM.
- Slide the VCM out of the bracket at an angle.
- Remove the PROM/Electronic Spark Control Module access cover.
- Remove the PROM/Electronic Spark Control Module by gently squeezing the PROM locks together.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Installation Procedure
Important: Press only on the ends of the PROM/Electronic Spark Control Module. Gently press on the PROM until it is firmly seated in the socket. Listen for the click.
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.
- Align the notches of the PROM/Electronic Spark Control Module with the notches in the PROM socket.
- Install the PROM in the PROM socket.
- Install the access cover on the VCM.
- Install the VCM in the engine compartment.
- Install the retaining spring over the edge of the VCM.
- Install the connectors to the VCM.
- 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.
- Connect the negative battery cable.
- Proceed to the VCM programming.
VCM Programming
- Take the following steps in order to set-up for the VCM (EEPROM) Programming.
- Refer to up-to-date Techline terminal and equipment user's instructions in order to program the VCM.
- If the VCM fails to program, do the following functions:
- Perform CKP System Variation Learn Procedure.
- For a functional check perform the Powertrain On-Board Diagnostic (OBD) System Check.
| • | The battery is fully charged. |
| • | The ignition is ON. |
| • | The Data Link Connector (DLC) is secure. |
| • | Check all the VCM connections. |
| • | Check the Techline terminal and equipment for the latest software version. |
| • | Try again to program the VCM. If it fails again, replace the VCM. |
