OEM 2003 Cadillac CTS Engine Control Module

2003 Cadillac CTS Engine Control Module Parts and Q&A

• Q: How to remove and install the engine control module (ECM) on 2003 Cadillac CTS?

  A: Begin the ECM removal by switching off ignition to defend its internal components. You must remove the screw which maintains the connection of the engine control module ground wire to the ECM. Widen the release levers to open position while disconnecting ECM connectors from the ECM device and avoid handling the pins because electrostatic discharge can damage the system. The ECM bracket should be released by removing its attached nuts to extract the ECM from its position. Position the ECM to the ECM bracket when the ignition is off and attach the nuts while tightening them to 8 N.m (71 lb in). Let the harness connectors align with the ECM connectors before manually pressuing them inside their positions during lever movement into locking position. Follow the installation steps to fix the ECM ground wire with its securing screw to the ECM while tightening it to 4.5 N.m (40 lb in). Program the ECM with the Service Programming System (SPS) and apply theft deterrent system programming if you use an ECM which came from a different vehicle. The new ECM from GM will immediately acquire the fuel continue password once the programming phase finishes. Using SPS, the theft deterrent system components require programming when the ECM comes from another vehicle. To learn the current vehicle's fuel continue password, you must follow either the 10-minute procedure or the 30-minute procedure after programming. The idle learn procedure must be executed as the last step.