Xterra XE 4WD V6-3.3L SC (VG33ER) (2002)
Voltage Check Method
To help in understanding the diagnosis of open circuits please refer to the 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 above example.
Testing For "Shorts" In the Circuit
TESTING FOR "SHORTS" IN THE CIRCUIT
Resistance Check Method
1. Disconnect the battery negative cable and remove the blown fuse.
2. Disconnect all loads (SW1 open relay disconnected and solenoid disconnected) powered through the fuse.