Safety Warning

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HOMESERVICE MANUALSNISSAN-DATSUN2004ALTIMA S, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEM - 2.5LDTC P045: EVAP CONTROL SYSTEM PRESSURE SENSORDIAGNOSTIC PROCEDURE

2004 Nissan-Datsun Altima S, Automatic

Diagnostic Procedure

2004 Nissan-Datsun Altima S, AutomaticSECTION Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Checking Ground Connections
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 2.
2. NG : Repair or replace ground connections.
CHECK CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
  
  Fig 2: Disconnecting EVAP Control System Pressure Sensor Harness Connector
  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.
  
  Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B105, F55
- 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. Disconnect ECM harness connector.
3. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67.
  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 7.
2. NG : GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B105, F55
- 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. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.
  Refer to Wiring Diagram .
  
  Continuity should exist.
2. 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 B105, F55
- 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

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.