Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

Check Ground Connections
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body, see Figure and Refer to GROUND INSPECTION .
  OK or NG
  1. OK: go to 2.
  2. NG: Repair or replace ground connections.
Check EVAP Control System Pressure Sensor Connector For Water
1. Disconnect EVAP control system pressure sensor harness connector. See Figure .
2. Check sensor harness connector for water.
  1. 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
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: go to 4.
2. NG: Replace EVAP control system pressure sensor.
Check Intermittent Incident
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT . For Wiring Diagram, Refer to WIRING DIAGRAM .
1. Inspection end

Factory Service Tools

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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.