Control Unit: Notes
CAUTION:
When certain materials rub together, a transfer of electrons from one material to another may occur under special conditions. This causes electrostatic charge (static electricity) build up in one of the materials. When any conducting material comes in contact with the charged material, electrostatic discharge occurs, transferring electrons to the third material. Electronic components used in control systems are designed to carry very low voltages; 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, ground yourself, and ground the work area to discharge stored electricity.
STATIC CHARGE (VOLTS)
| Movement | Humidity: 10-20% | Humidity: 65-90% |
|---|---|---|
| Walking Across Carpet | 35,000 | 1500 |
| Handling Clear Plastic Bag | 20,000 | 1200 |
| Sliding Across Velour Seat | 15,000 | 400 |
| Walking Across Tile/Vinyl | 12,000 | 50 |
| Handling Vinyl Envelope | 7000 | 600 |
CAUTION:
Static electricity can destroy integrated circuits within ECM. Before servicing ECM, ground yourself and the work area to discharge stored electricity.
CAUTION:
DO NOT
remove ECM from packaging until ready to install. Ground 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. See Fig 1.
NOTE:
Before replacing ECM, carefully inspect all wiring and control components. Ignition switch must be in OFF position when connecting or disconnecting ECM connector.