DTC Confirmation Test

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

Misfire is detected when crankshaft position sensor detects a fluctuation in engine speed. Possible causes are:

Incorrect spark plugs.
Insufficient compression.
Incorrect fuel pressure.
Defective EGR valve.
Injector circuit open or shorted.
Defective injectors.
Intake air leak.
Secondary ignition circuit open or shorted.
Lack of fuel.
Defective drive plate or flywheel.
Defective front Air-Fuel Ratio (A/F) sensor (sensor 1).

Connect scan tool to Data Link Connector (DLC). See Figure . Using scan tool, select DATA MONITOR. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and drive vehicle at 1500-3000 RPM for at least 3 minutes. Hold accelerator pedal as steady as possible. If first trip DTC is sets, perform DIAGNOSTIC PROCEDURE . If first trip DTC is not set, problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM.