OEM 2005 Cadillac CTS Engine Control Module

2005 Cadillac CTS Parts Questions & Experts Answers

• Q: How to replace the Engine Control Module (ECM) on 2005 Cadillac CTS?

  A: The replacement process of the Engine Control Module (ECM) must begin with switching off the ignition to protect component elements. Users should obtain and save replacement time data from the scan tool because failing to program new module values will result in defaults that trigger early engine oil replacement at 5000 km (3,000 mi) and automatic transmission fluid replacement at 83000 km (50,000 mi) after the most recent service. Check the main relay circuit voltage at the ecm Fuse inside the underhood Fuse block using a dvom to verify its wire is open circuit from power. To begin service disconnect the battery negative cable followed by removing the ecm Fuse and the tcm/ipc Fuse together with the ecm/tcm Fuse from the underhood Fuse block. You can unlock and remove the chassis side (upper) ecm electrical connector when you depress the lever lock and rotate the clamp lever while depressing the lock slide. Uno the body side (upper) ecm connector by disconnecting it at the outer edge before taking out the connecting pins while preserving their resistance to electrostatic discharge. Start by removing the redundant ground wire bolt along with the wire from the ecm followed by taking out the ecm through its bolts. To change the ecm bracket the electrical connector bracket bolt must be removed with its bracket and the ground wire bolt and wire together with the wire harness retainer bolt and retainer must be removed from the ecm bracket before unfastening the bracket's bolts. The first step for installation involves fitting the ecm bracket along with its bolts before tightening the cylinder head bolts to 10 n.m (89 lb in) and the engine front cover bolt to 23 n.m (17 lb ft). Screw in the wire harness retainer with its bolt and secure the electrical connector bracket and bolt and wiring harness ground wire with its bolt by applying the designated torque specifications. The installation consists of placing the ecm without touching connector pins and by tightening the ecm bolts to 10 n.m (89 lb in) and the redundant ground bolt to 5 n.m (44 lb in). Connect both lower engine and upper body ecm connectors and reinstall the underhood Fuse block components which include the ecm/tcm Fuse, tcm/ipc Fuse and ecm Fuse. Finish the procedure by reattaching the battery negative cable before performing a programming step and finally switching off the ignition and allowing a minimum of 5 seconds for post-programming.