Diagnostic Procedure

CHECK RUBBER TUBE
1. Turn ignition switch OFF.
2. Check rubber tube connected to the sensor for clogging, vent, kink, disconnection or improper connection.
OK or NG
1. OK: GO TO 2.
2. NG: Reconnect, repair or replace.
Fig 1: Checking Rubber Tube Connected To Sensor For Clogging, Vent, Kink
Courtesy of NISSAN MOTOR CO., U.S.A.
RETIGHTEN GROUND SCREWS
1. Loosen and retighten engine ground screws.
  1. GO TO 3.
Fig 2: Identifying Engine Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK CONNECTOR
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 4.
2. NG: Repair or replace harness connector.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between terminal 3 and ground with CONSULT-II or tester.
  1. Voltage: Approximately 5V
Fig 3: Checking Voltage Between Terminal 3 And Ground With CONSULT-II
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: GO TO 6.
2. NG: GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C3, B113
- Harness connectors B101, M67
- Harness connectors M81, F36
- Harness for open or short between EVAP control system pressure sensor and ECM
  1. Repair harness or connectors.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between EVAP control system pressure sensor terminal 1 and engine ground.
  Refer to Wiring Diagram.
  1. Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C3, B113
- Harness connectors B101, M67
- Harness connectors M59, F27
- Harness for open or short between EVAP control system pressure sensor and ECM
  1. Repair open circuit or short to power in harness or connectors.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 62 and EVAP control system pressure sensor terminal 2.
  Refer to Wiring Diagram.
  1. Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 10.
2. NG: GO TO 9.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C3, B113
- Harness connectors B101, M67
- Harness connectors M59, F27
- 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.
CHECK EVAP CANISTER VENT CONTROL VALVE
With CONSULT-II
1. Perform "VENT CONTROL/V" in "ACTIVE TEST" mode.
2. Check air passage continuity and operation delay time.
  
  Fig 4: Air Passage Continuity Specification
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Air Passage Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Operation takes less than 1 second.
Without CONSULT-II
1. Check air passage continuity and operation delay time under the following conditions.
  
  Fig 6: Air Passage Continuity Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 7: Checking Air Passage Continuity And Operation
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Operation takes less than 1 second.
  
  If NG or operation takes more than 1 second, clean valve using air blower or replace as necessary.
  
  If portion B is rusted, replace control valve.
  
  Make sure new O-ring is installed properly.
OK or NG
1. OK: GO TO 11.
2. NG: Replace EVAP canister vent control valve.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected.
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.
5. Check input voltage between ECM terminal 62 and ground.
Fig 8: Voltage Specification
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 9: Checking Input Voltage Between ECM Terminal 62 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below -93.3 kPa (-700 mmHg, -27.56 inHg) or over 101.3 kPa (760 mmHg, 29.92 inHg) of pressure.
OK or NG
1. OK: GO TO 12.
2. NG: Replace EVAP control system pressure sensor.
CHECK RUBBER TUBE
Check obstructed rubber tube connected to EVAP canister vent control valve.

OK or NG
1. OK: GO TO 13.
2. NG: Clean, repair or replace rubber tube.
CHECK WATER SEPARATOR
1. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A and C are not clogged by blowing air into B with A, and then C plugged.
5. In case of NG in items 2 - 4, replace the parts.
Fig 10: Checking Hoses
Courtesy of NISSAN MOTOR CO., U.S.A.
NOTE:
- Do not disassemble water separator.
OK or NG
1. OK: GO TO 14.
2. NG: replace water separator.
CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Check if water will drain from the EVAP canister.
Fig 11: Identifying EVAP Canister
Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No
1. Yes: GO TO 15.
2. NO: GO TO 17.
CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve attached.

The weight should be less than 1.8 kg (4.0 lb).

OK or NG
1. OK: GO TO 17.
2. NG: GO TO 16.
DETECT MALFUNCTIONING PART
Check the following.
- EVAP canister for damage
- EVAP hose between EVAP canister and water separator for clogging or poor connection
  1. Repair hose or replace EVAP canister.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END.