Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

RETIGHTEN GROUND SCREWS
Loosen and retighten engine ground screws.
1. GO TO 2.
  
  Fig 1: Tightening Engine Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
  
  Fig 2: Disconnecting EVAP Control System Pressure Sensor Harness Connector (P0453)
  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.
  
  Fig 3: Checking EVAP Control System Pressure Sensor Power Supply Circuit (P0453)
  Courtesy of NISSAN MOTOR CO., U.S.A.
Voltage: Approximately 5V

OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B2, M9
- Harness connectors M82, F102
- 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 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 .
  Continuity should exist.
3. 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 B2, M9
- Harness connectors M82, F102
- 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.
3. Refer to WIRING DIAGRAM .
  Continuity should exist.
4. 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 B2, M9
- Harness connectors M82, F102
- 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 RUBBER TUBE FOR CLOGGING
1. Disconnect rubber tube connected to EVAP canister vent control valve.
2. Check the rubber tube for clogging.
OK or NG
1. OK: GO TO 10.
2. NG: Clean the rubber tube using an air blower.
CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK: GO TO 11.
2. NG: Replace EVAP canister vent control valve.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to "COMPONENT INSPECTION ".

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 rubber tube using an air blower, repair or replace rubber tube.
CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Check if water will drain from the EVAP canister.
  
  Fig 4: Checking EVAP Control System Pressure Sensor Saturation With Water
  Courtesy of NISSAN MOTOR CO., U.S.A.
Yes or No
1. Yes: GO TO 14.
2. No: GO TO 16.
CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

The weight should be less than 2.1 kg (4.6 Ib).

OK or NG
1. OK: GO TO 16.
2. NG: GO TO 15.
DETECT MALFUNCTIONING PART
Check the following.
- EVAP canister for damage
- EVAP hose between EVAP canister and vehicle frame 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