VCM Replacement/Programming

NOTE: 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:
^ Service of the VCM consists of either replacement of the VCM or reprogramming of the VCM.
^ If the VCM is being replaced the knock Sensor (KS) module must be transferred to the replacement VCM.
^ The replacement VCM must be programmed before the vehicle will run.
^ The replacement VCM must have the Passlock Reprogramming procedure performed before the vehicle will run.
^ The replacement VCM must have the CKP System Variation Learn procedure performed or a DTC P1336 will set.

A shorted solenoid, relay coil, or harness will not damage the output driver module (ODM) in the VCM. A shorted solenoid, relay coil, or harness will cause the circuit and the controlled component to be inoperative.

When the circuit fault is not present or the technician has repaired the fault, the output driver module (ODM) will again operate in a normal manner due to its fault protected design.

Removal Procedure

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

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




1. Disconnect the negative battery cable.
2. Remove the VCM protective cover.




3. Install the access cover on the VCM.

NOTE: Refer to Fastener Notice in Service Precautions.

4. Install the access cover screws.

Tighten
Tighten the access cover screws to 4.8 N.m (42 lb in).




5. Connect the VCM connectors and retainer clips.




6. Insert the VCM into the VCM bracket. Ensure that the VCM is fully seated, so that the snap retainer is up into its normal position and is capable of retaining the module.




7. Fasten the snap retainer.




8. Install the VCM protective cover.
9. Connect the negative battery cable.
10. Program the VCM.

VCM Programming

IMPORTANT: Do not attempt to start the engine until the VCM has been programmed. False DTCs may be set.

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. Testing and Inspection
3. If the VCM fails to program, do the following functions:
^ Check all the VCM connections.
^ Check the ITCS terminal and equipment for the latest software version.
^ Try again to program the VCM. If the programming fails again, replace the VCM.

NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.




5. Remove the ECT sensor.

Installation Procedure




1. Coat the threads (only) with P/N 12346004 sealer or equivalent.

NOTE: Refer to Component Tightening Notice in Service Precautions.

2. Install the ECT sensor in the engine.

Tighten
Tighten the sensor to 20 N.m (15 lb ft).




3. Connect the ECT sensor harness connector.
4. Refill the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
5. Connect the negative battery cable.