Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws. See Figure .

1. : GO TO 2.

1. Disconnect EVAP control system pressure sensor harness connector.
2. Check sensor harness connector for water.

   Water should not exist. 

OK or NG 

1. OK: GO TO 3.
2. NG: Repair or replace harness connector.

1. Turn ignition switch ON.
2. Check voltage between EVAP control system pressure sensor terminal 1 and ground with CONSULT-II or tester.
   Fig 1: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 1 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   Voltage: Approximately 5V 

OK or NG 

1. OK: GO TO  5 .
2. NG: GO TO 4.

• Harness connectors B2, M2
• Harness connectors M81, F49
• Harness for open or short between EVAP control system pressure sensor and ECM

1. : Repair harness or connectors.

1. Turn ignition switch OFF.
2. Check harness continuity between EVAP control system pressure sensor terminal 3 and engine ground.

   Refer to Wiring Diagram.

   Continuity should exist. 

3. Also check harness for short to power.

OK or NG 

1. OK: GO TO  7 .
2. NG: GO TO 6.

Check the following.

• Harness connectors B2, M2
• Harness connectors M81, F49
• Joint connector-20
• Harness for open between EVAP control system pressure sensor and ECM
• Harness for open between EVAP control system pressure sensor and TCM (Transmission Control Module)

1. : Repair open circuit or short to power in harness or connectors.

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 60 and EVAP control system pressure sensor terminal 2.

   Refer to Wiring Diagram.

   Continuity should exist. 

3. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO  9 .
2. NG: GO TO 8.

Check the following.

• Harness connectors B2, M2
• Harness connectors M81, F49
• Harness for open or short between ECM and EVAP control system pressure sensor

1. : Repair open circuit or short to ground or short to power in harness or connectors.

1. Remove EVAP control system pressure sensor with its harness connector connected
   CAUTION: Never apply force to the air hole protector of the sensor if equipped. See Figure .
   Fig 2: Checking EVAP Control System Pressure Sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Remove hose from EVAP control system pressure sensor.
3. Turn ignition switch ON.
4. Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in Figure .
   CAUTION:

   • Always calibrate the vacuum pump gauge when using it.
   • Do not apply below -2 kPa (-150 mmHg, -5.91 inHg) or over 20 kPa (150 mmHg, 5.91 inHg) of pressure.
5. Check input voltage between ECM terminal 60 and ground. See Figure and Figure .
   CAUTION: Discard and EVAP control system pressure sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.

OK or NG 

1. OK: GO TO 10.
2. NG: Replace EVAP control system pressure sensor.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

1. : INSPECTION END