Engine Control Module: Notes
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.
CAUTION:
Electronic components used in control systems are designed to carry very low voltages. As little as a 30-volt charge created by static electricity can cause a total or degrading failure in ECM or other electronic components containing integrated circuits. Before servicing ECM, technician must ground himself and work area to discharge static electricity.
CAUTION:
Do not remove part from packaging until ready to install. Ground any static-proof package before opening. DO NOT touch electrical terminals of components unless properly grounded. Do not lay electrical components on car seat, carpeting or dashboard. Use electrostatic protection mat and ground strap whenever possible. Do not touch the connector pins or soldered components on the circuit board in order to prevent possible Electrostatic Discharge (ESD) damage to the PCM. Before replacing ECM, carefully inspect all wiring and control components. Failure to test for short circuits may result in repeated ECM failure due to shorts and Quad-Driver failure. To prevent internal damage to ECM, ensure ignition switch is in OFF position when connecting or disconnecting ECM harness connectors or any electrical components.
NOTE:
Vehicles equipped with Allison transmission use a Transmission Control Module (TCM) for transmission control.