Electronic Service Precautions
GENERAL ELECTRONIC SERVICE PRECAUTIONS1. Discharge any static electrical charges before handling sensitive parts by touching ground or maintaining a ground connection to a bare skin area like the wrist, when servicing sensitive parts.
2. Fully release electrical connector locks prior to disconnecting, and ensure connectors are fully seated with insulators and shields in place when reconnecting.
3. Never ground or apply full battery voltage to a component unless directed to do so in a test procedure. Directly grounding or applying battery voltage to a circuits could damage the control unit or system components.
4. When replacing electronic components, disconnect the battery ground.
NOTE: Before removing battery ground, access trouble codes. control unit memory will be erased if ground cable is removed.
5. Do NOT try to disassemble the control unit.
6. Never touch the control unit connector pins, integrated circuit connector pins, or soldered components on the control unit circuit board.
7. To prevent deforming control unit harness connectors, do not probe terminals directly. Instead, insert a pin from the harness side and perform measurements through pin.
8. When measuring voltage at the control unit harness connector, disconnect harness connector first, then turn ignition "ON" as necessary.
9. Use a digital multi-meter with a minimum 10 Meg-ohms internal impedance when testing the control unit or related components, unless use of an analog meter is specified by the testing procedure.
10. Use CAUTION NOT to create an arc while checking the continuity of a circuit.
11. Avoid getting water on any of the Fuel and Engine Control System Components.
12. Before performing electrical welding (for instance, spot welding), disconnect the climate control, injection, cruise control, control unit and radio.
13. In cases when temperatures may exceed 176°F (80°C), (example: infra-red spray booth), remove all control units.
14. Always verify that the battery is properly connected to the vehicle prior to starting the engine.
15. Do NOT disconnect the battery while the engine is running.
16. When charging a battery, be sure vehicle battery cables are disconnected.
17. The battery contains acid and produces explosive gas (hydrogen), avoid creating sparks near battery.
18. Never connect or disconnect electrical connections with the ignition switch in the "ON" position unless specifically directed to do so in a test procedure.
19. In order to disable the ignition system, unplug the primary connections only. NEVER disconnect the secondary leads to disable the ignition system.
20. Never pierce ignition leads or insulator boots to connect timing lights or analyzers. Use proper adapters.
21. When removing a spark plug wire twist the boot one quarter turn and pull on the boot only, never the lead itself.
22. Fuel and Engine Control System wiring should be at least 4 inches away from the high tension cables of the Ignition System, or be routed at a 90° angle.
23. Never use a booster/starter which has a voltage rating above 12 volts to start engine.