Engine Control Module: Installation
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Install the ECM. Ensure that the mounting tabs are engaged. Secure the spring latch to the ECM. Connect the ECM electrical connectors. Tighten the ECM electrical connector bolts to specification. See TORQUE SPECIFICATIONS .
- Install the ECM cover. If equipped with the Allison transmission, install the engine harness clip to the ECM cover. Connect the negative battery cables. Tighten negative battery terminal bolts to specification.
- If a NEW ECM was installed, program the ECM. See ENGINE CONTROL MODULE under PROGRAMMING.