Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999LUMINA V6-3.8L VIN KREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIR
1999 Chevrolet Lumina V6-3.8L VIN K
Engine Control Module: Service and Repair
1999 Chevrolet Lumina V6-3.8L VIN KSECTION Service and Repair
PCM Replacement/Programming
NOTICE: In order to prevent possible Electrostatic Discharge damage to the PCM, Do Not touch the connector pins or the soldered components on the circuit board.
Service of the PCM should normally consist of either replacement of the PCM or EEPROM programming.
If the diagnostic procedures call for the PCM to be replaced, PCM should be checked first to see if it is the correct part. If it is, remove the faulty PCM and install the new service PCM.
THE SERVICE PCM EEPROM WILL NOT BE PROGRAMMED. DTC P0602 indicates the EEPROM is not programmed or has malfunctioned.
REMOVAL PROCEDURE
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Remove the negative battery cable.
2. Remove the engine coolant reservoir purge hose.
3. Remove the fuse block.
4. Remove the PCM access cover.
5. Remove the connectors from the PCM.
6. Remove the PCM from engine compartment.
INSTALLATION PROCEDURE
1. Install the PCM in the engine compartment.
2. Install the connectors to the PCM.
3. Install the PCM access cover.
4. Install the fuse block.
5. Install the engine coolant reservoir purge hose.
6. Install the negative battery cable.
If a new PCM is being installed, program the EEPROM. Testing and Inspection
NOTICE: In order to prevent possible Electrostatic Discharge damage to the PCM, Do Not touch the connector pins or the soldered components on the circuit board.
Service of the PCM should normally consist of either replacement of the PCM or EEPROM programming.
If the diagnostic procedures call for the PCM to be replaced, PCM should be checked first to see if it is the correct part. If it is, remove the faulty PCM and install the new service PCM.
THE SERVICE PCM EEPROM WILL NOT BE PROGRAMMED. DTC P0602 indicates the EEPROM is not programmed or has malfunctioned.
REMOVAL PROCEDURE
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Remove the negative battery cable.
2. Remove the engine coolant reservoir purge hose.
3. Remove the fuse block.
4. Remove the PCM access cover.
5. Remove the connectors from the PCM.
6. Remove the PCM from engine compartment.
INSTALLATION PROCEDURE
1. Install the PCM in the engine compartment.
2. Install the connectors to the PCM.
3. Install the PCM access cover.
4. Install the fuse block.
5. Install the engine coolant reservoir purge hose.
6. Install the negative battery cable.
If a new PCM is being installed, program the EEPROM. Testing and Inspection
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.