200SX L4-1998cc 2.0L DOHC MFI (SR20DE) (1995)
DON'T USE
Test lights. They are not recommended due to the possibility of damage to the computer or air-bag circuits.
BE PREPARED
Before attempting to diagnose a circuit for an open or a short, it is important that you:
1.
Have the proper reference material available:
^ Power Supply Routings
^ Applicable Wiring Diagrams
^ Troubleshooting Information
2.
Understand how the system works.
3.
Have a good understanding of what condition you are diagnosing:
^ Situation when the problem occurs. (weather, loads, etc.)
^ What systems interact with the one you are diagnosing?
^ Is it intermittent or a consistent problem?
4.
Have proper equipment to perform the diagnosis such as a digital voltmeter, alligator clips, and probe leads.
Examples of Common Electrical Incidents
The illustration shows some, but not all, areas to check for common electrical incidents.
Ground Inspection
WHY INSPECT GROUND CONNECTIONS
Ground connections are very important to the proper operation of electrical and electronic circuits. They are often exposed to moisture and can get a
corrosive film of rust on the exposed metal.
A loose or corroded ground can alter a circuit. Many computer controlled circuits operate in the 5 volt range and can be seriously affected by a voltage
change as low as one tenth (0.1V) of a volt. A poor or corroded ground can easily affect the circuit by that amount.
HOW TO INSPECT GROUND CONNECTIONS
^ Remove the ground bolt screw or clip.