Theory Of Operation
The purpose of the following procedure is to demonstrate different methods of checking for a short to voltage in a circuit. When diagnosing a DTC it might be necessary to verify that proper voltage is on a circuit or that a circuit is not shorted high.
NOTE:
The circuit shown in the illustration is an example, and is intended for demonstrational purpose only.
The following are circuit tests covered in this procedure:
- Testing For A Short To Battery Voltage Using A Voltmeter
- Testing For A Short To Switched Battery Voltage Using A Voltmeter
- Testing For A Short To Battery Voltage Using A 12-Volt Test Light
- Testing For A Short To Switched Battery Voltage Using A 12-Volt Test Light
NOTE:
Perform the following test using a known good test light or functioning multimeter.
Below is a list of possible causes that could be related to a Short To Voltage condition.
| Possible Causes |
|---|
| SHORTED CIRCUIT (CHAFED, PIERCED OR PINCHED WIRES) |
| SHORTED IN-LINE CONNECTOR (BENT, PUSHED OUT OR CORRODED TERMINALS) |