Removal, overhaul and installation procedures (when given by manufacturer) are covered in this article. If component removal and installation is primarily an unbolt and bolt-on procedure, only a simple torque specification may be supplied.
IGNITION SYSTEM POWERTRAIN CONTROL MODULE (PCM)
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 PCM or other electronic components containing integrated circuits. Before servicing PCM, ground yourself and ground work area to discharge stored 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.
Servicing PCM Using 3M Anti-Static Mat Courtesy of General Motors Corp.
NOTE: Before replacing PCM, carefully inspect all wiring and control components. Failure to test for short circuits may result in repeated PCM failure due to grounds and Quad-Driver failure. To prevent internal damage to PCM, ensure ignition switch is in OFF position when disconnecting or reconnecting PCM connectors or 12-volt components.
NOTE: When replacing defective PCM, remove knock sensor module or PROM from defective PCM. New PCM does not come equipped with knock sensor module or PROM (if applicable). Install knock sensor module or PROM into new PCM.
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Saturday, June 12, 2010
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