Engine Control Module: Service and Repair

PCM Mounting:

PCM Bracket Removal:

NOTE: To prevent internal PCM damage, the ignition must be "OFF", when disconnecting or reconnecting power to the PCM.

Remove or Disconnect:
1. Disconnect negative battery cable
2. Disconnect PCM mounting hardware

PCM And Connectors:

3. Disconnect PCM electrical connectors
4. Remove PCM from engine compartment

PCM Access Cover:

5. Remove PCM access cover

Knock Sensor Module - Removing From PCM:

6. Remove knock sensor module from PCM

Install or Connect:
1. Install knock sensor module and access cover
2. Install PCM in vehicle
3. Connect PCM electrical connectors
4. Connect PCM mounting hardware
5. Connect negative battery cable

EEPROM Programming

CAUTION: The software/calibration used for PCM reprogramming must match the vehicle application, or improper operation and/or damage may occur.

^ Ensure battery is charged
^ Turn ignition "ON"
^ Ensure connections to the Data Link Connector (DLC) and battery/cigar lighter are secure
^ Follow the most current Techline terminal/equipment instructions

PCM Reprogramming Failure

^ Check PCM connections
^ Check Decline terminal/equipment for latest software version
^ Repeat reprogramming procedures. If it fails again, replace the PCM. The replacement PCM must be programmed.

PCM Functional Check

^ Refer to DIAGNOSIS, TESTING AND INSPECTION PROCEDURES.