Pinpoint Test Instructions

- Do not perform any of the Pinpoint Tests unless instructed to do so.

- Each Pinpoint Test assumes that you are diagnosing causes for a specific symptom described in the Diagnostic Routines and that every cause with a higher probability has been checked and verified to be operating properly.

- If more than one Diagnostic Trouble Code (DTC) is received, always start service with the first code received.

- Probable systems listed in the Diagnostic Routines should be diagnosed only when the Diagnostic Quick Test steps have resulted in a pass code. With the knowledge of the symptom, a close observation can be made of each specified component, by performing the associated pinpoint test.

- Performing a complete visual inspection will often lead to the source of a problem without performing any test step. For example, when directed to a Pinpoint Test, look carefully at the electrical schematic and special notes. Check each component and the related wiring to the control module for any evidence of damage. Loose connections, corrosion, overheating, and physical damage are often the cause of failure.

- Do not replace any parts unless the test result indicates they should be replaced.

- Do not measure voltage or resistance at the control module or connect any test lights to it, unless otherwise specified.

- Do disconnect solenoids and switches from the harness before measuring for continuity or resistance, or before energizing with a power source

- Do start with the first pinpoint test step and follow the appropriate result in order, until the cause of a fault is found.

- Do erase codes and perform Diagnostic Quick Test after recommended action has been taken to ensure any repairs made are effective.