Pinpoint Test Notes

- The No Module Communication Test must be performed to verify power and ground to the suspect module before performing any of the following pinpoint tests. Refer to referencing component system for test.

- Do not perform any of the following pinpoint tests unless you are so instructed. Each pinpoint test assumes that a fault has been detected in the system with direction to enter a specific diagnostic routine. Performing any pinpoint test without direction may produce incorrect results and replacement of working components. Correct test results are dependent on the proper operation of related components/systems. It may be necessary to correct any concerns in these areas before passing the test.

- Do not replace any parts unless the test results indicate they should be replaced.

- When more than one DTC is received, always start with the first DTC received.

- Follow correct pinpoint test procedures steps in order as listed. Follow each step until a condition is found.

- After completing any service to the communication system, verify all components are properly reconnected, then clear all DTCs. Refer to NGS Hook-up procedure for DTC clearing procedure.