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.
2012 Infiniti QX56 RWDFACTORY OEM SERVICE PROCEDURE
High Fuel Pressure Check
NOTE:
Since the fuel pressure gauge kit cannot be connected, follow the method shown below to check high fuel pressure.
WITH CONSULT
- Start engine.
- Check "FUEL PRES SEN V" in "DATA MONITOR" mode with CONSULT.
Monitor Item Condition Values/Status FUEL PRES SEN V Idle 980 - 1, 200 mV Revving engine from idle to 4, 000 rpm quickly 1, 100 - 2, 900 mV WITHOUT CONSULT
- Start the engine.
- Check fuel rail pressure sensor signal voltage.
+ - Condition Value (Approx.) Fuel rail pressure sensor Connector Terminal F26 2 Ground Engine speed: idle 0.98 - 1.2 V Engine speed: Revving engine from idle to 4, 000 rpm quickly 1.1 - 2.9 V
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.
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