Diagnostic Procedure

CHECK RUBBER TUBE CONNECTED TO THE SENSOR
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.
RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
  
  Fig 1: Tightening Engine Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
1. : GO TO 3.
CHECK HARNESS CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
  
  Fig 2: Identifying EVAP Control System Pressure Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
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 POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between terminal 3 and engine ground with CONSULT-II or tester.
  Voltage : Approximately 5V
  
  Fig 3: Checking Power Supply
  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 C1, M67
- Harness connectors M59, F27
- Harness for open or short between EVAP control system pressure sensor and ECM
  1. : Repair harness or connectors.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between EVAP control system pressure sensor terminal 1 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 8.
2. NG : GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors C1, M67
- Harness connectors M81, F36
- 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 INPUT SIGNAL CIRCUIT
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 .
  
  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 C1, 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 ground or short to power in harness or connectors.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE
1. Turn ignition switch OFF.
2. Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.
OK or NG
1. OK : GO TO 11.
2. NG : Repair it.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected.
  
  Fig 4: Identifying EVAP Control System Pressure Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Remove hose from EVAP control system pressure sensor.
3. 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 -93.3 kPa (-700 mmHg, -27.56 inHg) or over 101.3 kPa (760 mmHg, 29.56 inHg) of pressure.
4. Check output voltage between ECM terminal 62 and engine ground.
  
  Fig 6: Checking Voltage Between ECM Terminal And Engine Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  CAUTION: Discard any 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 12.
2. NG : Replace EVAP control system pressure sensor.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END.