DTC Confirmation Test "B"

WARNING: This page is about a different car, the 2002 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Engine coolant temperature must remain less than 194°F (90°C) during confirmation test "B".

Malfunction "B" is detected when ECM receives an incorrect voltage from IAT sensor, compared to Engine Coolant Temperature (ECT) sensor voltage. Possible causes are:

IAT sensor circuit open or shorted.
Defective IAT sensor.

To set DTC, ensure engine is cold. Turn ignition on. Using scan tool, select DATA MONITOR. Start engine and test drive vehicle at 44 MPH or more for 100 consecutive seconds. If first trip DTC is detected, go to DIAGNOSTIC PROCEDURE .