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 PCM or other electronic components containing integrated circuits. Before servicing PCM, ground yourself, and ground the work area to discharge stored electricity.
STATIC CHARGE (VOLTS)
| Movement/Action | Relative Humidity 10-20% | Relative Humidity 65-90% |
|---|---|---|
| Handling Clear Plastic Bag | 20,000 | 1200 |
| Handling Vinyl Envelope | 7000 | 600 |
| Sliding On Velour Seat | 15,000 | 400 |
| Walking On Carpet | 35,000 | 1500 |
| Walking On Tile/Vinyl | 12,000 | 50 |
CAUTION:
DO NOT
remove PCM 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 PCM, carefully inspect all wiring and control components. Ensure ignition switch is in OFF position when connecting or disconnecting PCM connector.