Sunfire L4-2.2L VIN 4 (1996)
A simple tester (J 34764) can detect a blown fuse. To check a fuse, the tester is applied directly to the fuse in the Fuse Block. Two probes contact the
fuse, either into the slots of a flat fuse or to the metal ends of a glass fuse. With power ON, a red Light Emitting Diode (LED) in the tester lights if the
fuse is open. The handle of the tester is a tool for removing either type of fuse.
Special Tools
Circuit Breakers
A circuit breaker is a protective device designed to open the circuit when a current load is in excess of rated breaker capacity. If there is a short or other
type of overload condition in the circuit, the excessive current will open the circuit between the circuit breaker terminals. There are two basic types of
circuit breakers used in GM vehicles: cycling and non-cycling.
Cycling Circuit Breaker
The cycling breaker will open due to heat generated when excessive current passes through it for a period of time. Once the circuit breaker cools,
