OEM Cadillac STS Engine Control Module

Cadillac STS Engine Control Module Parts and Q&A

• PCM
  12678511
  Q: How to replace the Engine Control Module (ECM) on Cadillac STS?

  A:

  Proper installation of a new ecm requires turning off the ignition to safeguard against electric damage affecting the connectors and power connections including the Battery Cable and control module fuse. All contact between the control module metal case and battery voltage must be avoided as well as touching soldered components and connector pins since electrostatic discharge poses a threat to device damage. When servicing the control module testers should be cleaned of debris and gasket installation needs verification for contaminant protection. If you do not program engine oil life or automatic transmission fluid data into the new module through a scan tool then the replacement module will automatically reset to 100 percent. This action compels an oil change at 5000 km (3,000 mi) alongside a transmission fluid change at 83000 km (50,000 mi). Remove the battery negative cable first while lifting and supporting the vehicle and then removing the front air deflector. The ecm electrical connectors need disconnection before removing its mounting nuts and extracting the ecm. Install new ecm by positioning it in the vehicle then tightly securing the mounting nuts to 8 n.m (71 lb in) before reattaching electrical connectors and reinstalling the front air deflector and lowering the vehicle and reconnecting the battery negative cable. Programming of the ecm completes the installation process to achieve proper system functioning.
• PCM
  19300016
  Q: How to service the Engine Control Module (ECM) on Cadillac STS?

  A:

  Service of the Engine Control Module (ECM) requires either replacemnt of the ecm or programming electrically erasable programmable read-only memory (EEPROM). Check that the new ecm matches the specifications before taking out the damaged unit for installation of the service ecm. You need to switch off the ignition before working with any control module connectors and power connections to stop damaging their internal components. Touching the pins or soldered components of the control module is prohibited to protect it from electrostatic discharge. Also avoid having the metal module case near battery voltage. The debris surrounding control module connector surfaces must be removed before spot-checking gaskets for proper installation to block contaminants from entering the system. The replacement control module must be programmed after installation but recording the original engine oil life and automatic transmission fluid life remains essential since failing to do so will initialize oil service at 5000 km (3,000 mi) and 83000 km (50,000 mi). The first step involves obtaining fluid lives with a scan tool before cutting off the negative Battery Cable for removal. Open the engine wiring harness connectors on the ecm and remove the ecm by unscrewing its bracket retainers. To remove the ecm bracket users should first depress its locking tabs. The installation process requires users to first lower the ecm bracket onto the locking tabs before fitting the ecm into its place and confirming the retainer connection. Attach the wiring harness connectors to the ecm while using the provided locking mechanisms before reattaching the negative cable to the battery. Programming may be necessary after which you must press the ignition button for at least 5 seconds post programming.