Problem Diagnosis

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Infiniti QX4, 2003 Infiniti Q45, 2003 Infiniti M45, 2003 Infiniti I35, and 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Perform the following procedure when problem was not found after performing testing procedure, when Diagnostic Trouble Code (DTC) cannot be verified using DTC CONFIRMATION TESTS, or when reported symptom does not recur.

Clear DTCs. See appropriate SELF-DIAGNOSTICS article. Inspect affected circuit ground connections by removing ground bolt or screw. Inspect all mating surfaces for rust, dirt or corrosion. Clean all mating surfaces as necessary. Reinstall bolt or screw.
Check for aftermarket electrical accessories which may be interfering with ground circuit. Perform INTERMITTENT SIMULATION under TEST PROCEDURES.
The most common cause of an intermittent problem is poor electrical connections. Inspect affected harness connectors for loose connections, corrosion or loose connections.