2. Detect Malfunctioning Part

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Check the following.

Harness connectors E131, M92
Harness connectors F44, F101
IPDM E/R harness connector E122
Harness for open or short between intake valve timing control solenoid valve and IPDM E/R
Harness for open or short between intake valve timing control solenoid valve and ECM
1. Repair harness or connectors.