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.
High Pressure Fuel System Test
The high pressure fuel system test commands the PCM to increase the engine speed and fuel pressure. The test increases the fuel pressure to a maximum pressure of 170 MPa (24,650 psi) in several increments. The high pressure fuel system test monitors the amount of time the vehicle is able to maintain the requested fuel pressures. This procedure may be used to assist in diagnosing several driveability concerns. The high pressure fuel system test is located on the scan tool under the tool box tab. Select Powertrain, Fuel, Fuel System Test to access high pressure fuel system test.
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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.