Refer to the appropriate system or the schematics of the engine harness if a troubleshooting procedure instructs the user to “Analyze and Repair the Harnessing”.
Continuity checks and resistance checks should be performed at the connector locations in order to locate a failure in the harness. At a component connector, always check the ground circuit. Less than five ohms of resistance is required from the ground contacts to frame ground. A problem can be incorrectly diagnosed if resistance is greater than 5 ohms in the ground circuit.
During a troubleshooting procedure, inspect all component and harness connections before a component is replaced. If these connections are not clean and tight, the connection can cause an electrical problem.
A problem can be persistent or intermittent. Ensure that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are performed. A failure of a connection of one electrical component can cause the failure of another electrical component. Always attempt to find a failure of a connection. Correct the failed connection before replacing a component.