OEM 2009 Cadillac STS Engine Control Module

2009 Cadillac STS Parts Questions & Experts Answers

• Q: How to replace the Engine Control Module (ECM) on 2009 Cadillac STS?

  A: The first step for ecm replacement begins with a step to turn off the ignition to protect connectors and power system when removing power. Touching either the metal case of the control module with battery voltage or handling the connector pins and solder components will result in electrostatic discharge damage to the system. The connector surfaces of the control module should be free of debris and gaskets need appropriate installation to stop contaminants from entering. You need to note the current life values of engine oil and automatic transmission fluid because the replacement module requires this data to work properly; otherwise it will reset to 100 percent resulting in premature oil change at 5000 kilometers (3,000 miles) and transmission fluid change at 83000 kilometers (50,000 miles) respectively. Begin the work with a scan tool to retrieve and record existing fluid lives and proceed by taking out the negative Battery Cable. To replace the ecm the engine wiring harness connectors must first be unlocked along with disconnecting their connectors until the retainers for the ecm bracket can be released to remove the ecm. When you need to replace the ecm bracket you must push down the locking tabs first before removing it. To install the ecm bracket properly put the new bracket piece inside before confirming proper bracket lock. First insert the ecm into the bracket with careful retention checking then lock both wiring harness connectors of the engine system onto the ecm. The negative Battery Cable reinstallation should be followed by any required ecm programming procedures. Turn off the ignition during at least 5 seconds after completing the programming steps.