VOLTAGE CHECK METHOD Nissan Sentra B15

VOLTAGE CHECK METHOD

To help in understanding the diagnosis of open circuits please refer to the previous schematic.

In any powered circuit, an open can be found by methodically checking the system for the presence of voltage. This is done by switching the DMM to the voltage function.

1. Connect one probe of the DMM to a known good ground.
2. Begin probing at one end of the circuit and work your way to the other end.
3. With SW1 open, probe at SW1 to check for voltage. Voltage; open is further down the circuit than SW1. No voltage; open is between fuse block and SW1 (point A).
4. Close SW1 and probe at relay. Voltage; open is further down the circuit than the relay. No voltage; open is between SW1 and relay (point B).
5. Close the relay and probe at the solenoid. Voltage; open is further down the circuit than the solenoid. No voltage; open is between relay and solenoid (point C).

Any powered circuit can be diagnosed using the approach in the previous example.