OEM 2003 Buick LeSabre Engine Control Module

2003 Buick LeSabre Parts Questions & Experts Answers

• Q: How to replace the Engine Control Module (ECM) on 2003 Buick LeSabre?

  A: Before pcm replacement you should ensure that the pcm is both the correct component and shows signs of failure when removing it. The starting point is to switch off ignition and remove the negative Battery Cable. Start by removing the intake duct and then the two screws originating from the upper and lower air cleaner assembly sections before proceeding to detach the upper air cleaner housing assembly. The first step involves taking the pcm and harness outside pcm housing while the connectors stay intact. Next step is to disconnect these connectors. The pcm connector installation procedure needs a 8 n.m (71 lb in) torque for proper connection. Reinstall the pcm and harness inside the pcm housing after which install and tighten the two screws on the upper air cleaner housing assembly to 4 n.m (35 lb in). Reinstall the duct pipe after putting the negative cable battery back in place. The secondary air pump operation on the new pcm remains disabled until 10 miles of accumulated driving occurs according to service programming system (SPS) programming protocols. The system recognition to detect an unprogrammed or malfunctioning eeprom triggers dtc p0602 so it is fundamental to keep away from the connector pins while preventing electrostatic discharge (ESD) damage and to keep the ignition off during pcm connector and power connection maintenance to protect internal components.