Fault Code 3, Tunnel Sensor Circuit Is Defective.
WARNING: This page is about a different car, the 1993 Nissan Sentra, 1993 Nissan NX, 1993 Nissan Maxima, 1993 Nissan Altima, and 1993 Nissan 300ZX. However, it is still accessible from the selected car via links, so may be relevant.
- Possible Causes Yellow/Red wire and/or Yellow/Black wire are open or are shorted to each other. Yellow/Black wire from control unit terminal No. 6 to tunnel sensor is shorted to battery voltage.
- Corrective Action Visually check harness connections. Replace safing sensor and tunnel sensor as a unit. Replace control unit. Replace main harness.