Detonation Retard Operation
WARNING: This page is about a different car, the 1989 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
Problems with the detonations retard circuit should set a trouble code 34. If code is present, see code 34 chart in TESTS W/CODES article. Check knock sensor wire for open or short to ground. Check knock sensor shield ground wire for continuity to ground. Check routing of knock sensor wire. Wire should not be routed close to spark plug wires or high output accessories.