4 Check Intake Sensor Circuit Between Intake Sensor And Auto Amp.

WARNING: This page is about a different car, the 2004 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect auto amp. harness connector.
Check circuit continuity between intake sensor harness connector terminal No. 1 and auto amp. harness connector terminal No. 1.

Fig 1: Checking Intake Sensor Circuit Between Intake Sensor And Auto Amp
Courtesy of NISSAN MOTOR CO., U.S.A.

Continuity should exist.

If OK, check harness for short.

OK or NG

OK:

Replace auto amp.
Go to FUNCTION CONFIRMATION PROCEDURE and perform self-diagnosis STEP-2.
Confirm that code No. 20 is displayed.

NG: Repair harness or connector.