Overall Function Check

Use this procedure to check the overall function of the EVAP control system purge flow monitoring. During this check, a 1st trip DTC might not be confirmed.

WITH GST

1. Lift up drive wheels.
2. Start engine (VDC switch OFF) and warm it up to normal operating temperature.
3. Turn ignition switch OFF, wait at least 10 seconds.
4. Start engine and wait at least 70 seconds.
5. Set voltmeter probes to ECM terminals 32 (EVAP control system pressure sensor signal) and ground.
6. Check EVAP control system pressure sensor value at idle speed and note it.
7. Establish and maintain the following conditions for at least 1 minute.
   AIR CONDITIONER SWITCH CHART
   
   

   Air conditioner switch	ON
   Headlamp switch	ON
   Rear window defogger switch	ON
   Engine speed	Approx. 3, 000 RPM
   Selector lever position	Any position other than P, N or R

   Fig 1: Checking ECM Voltage

   Courtesy of NISSAN MOTOR CO., U.S.A.
8. Check that EVAP control system pressure sensor value stays 0.1V less than the value at idle speed (measured at step 6) for at least 1 second.
9. If NG, go to "DIAGNOSIS PROCEDURE ".