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SERVICE INFORMATION FOR ELECTRICAL INCIDENT GI-47 < BASIC INSPECTION > C D E F G H I J K L M B GI N O P TESTING FOR “OPENS” IN THE CIRCUIT Before you begin to diagnose and test the system, you should rough sketch a schematic of the system. This Continuity Check Method The continuity check is used to find an open in the circuit. The digital multimeter (DMM) set on the resistance tion of the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an over • Connect the probes between SW1 and the relay. Little or no resistance will indicate that portion of the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an over limit or infinite resis- • Connect the probes between the relay and the solenoid. Little or no resistance will indicate that portion of the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an over limit or infi- Any circuit can be diagnosed using the approach in the previous example. Voltage Check Method To help in understanding the diagnosis of open circuits please refer to the previous schematic. voltage: open is further down the circuit than SW1. • Close SW1 and probe at relay. voltage: open is further down the circuit than the relay. • Close the relay and probe at the solenoid. voltage: open is further down the circuit than the solenoid. Any powered circuit can be diagnosed using the approach in the previous example. TESTING FOR “SHORTS” IN THE CIRCUIT SGI846-A |