Diagnostic Procedure

RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
  
  Fig 1: Identifying Engine Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  1. GO TO 2.
CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
  
  Fig 2: Identifying EVAP Control System Pressure Sensor & Components
  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 3.
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 EVAP control system pressure sensor terminal 3 and ground with CONSULT-II or tester.
  Voltage: Approximately 5V
OK or NG
1. OK: GO TO 5
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B1, M14
- Harness connectors M59, F27
- 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. Disconnect ECM harness connector.
3. Disconnect TCM harness connector (A/T models).
4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 7.
2. NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B1, M14
- Harness connectors M58, F26
- Harness for open or short between EVAP control system pressure sensor and TCM
- 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 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 32 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.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B1, M14
- Harness connectors M58, F26
- 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 CONTROL SYSTEM PRESSURE SENSOR
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 10.
2. NG: Replace EVAP control system pressure sensor.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. INSPECTION END