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.

Malfunction is detected when EGR flow is detected under conditions that do not call for EGR. Possible causes are:

EGR volume control valve circuit open or shorted.
EGR volume control valve stuck open or leaking.
Defective EGR temperature sensor.

Connect scan tool to Data Link Connector (DLC). See Figure . Turn ignition on. Using scan tool, ensure engine coolant temperature is 14-122°F (-10-50°C). Using a DVOM, backprobe PCM harness connector and measure voltage between ground and terminal No. 72 (Purple wire) at PCM harness connector. See Figure and Figure . Voltage should be less than 4.8 volts. Start engine and let idle for at least 80 seconds. Turn ignition off. Turn ignition on. Using scan tool, ensure engine coolant temperature is 14-122°F (-10-50°C). Using a DVOM, backprobe PCM harness connector and measure voltage between ground and terminal No. 72 (Purple wire) at PCM harness connector. Voltage should be less than 4.8 volts. Start engine and let idle for at least 80 seconds. 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.