Engine Controls - System & Component Testing: Introduction
Before testing separate components or systems, perform procedures in BASIC DIAGNOSTIC PROCEDURES article. Since the introduction of OBD-II, most all computer-controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction. Information for these components is covered in appropriate SELF-DIAGNOSTICS article.
NOTE:
Testing individual components does not isolate a short or open circuit. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.
NOTE:
For wire color and connector color abbreviation definitions, see WIRE COLOR IDENTIFICATION table.
WIRE COLOR IDENTIFICATION
| Abbreviation | Wire Color |
|---|---|
| B | Black |
| BR | Brown |
| CH | Dark Brown |
| DG | Dark Green |
| G | Green |
| GY | Gray |
| L | Blue |
| LG | Light Green |
| OR | Orange |
| P | Pink |
| PU | Purple |
| R | Red |
| SB | Light Blue |
| W | White |
| Y | Yellow |