Diagnostic Instructions
DTC Descriptor
DTC P009E: Fuel Rail Pressure Relief Valve Performance
Circuit/System Description
The engine control module (ECM) uses the fuel rail pressure (FRP) sensor to monitor the high side fuel pressure and the fuel rail pressure relief valve performance. The fuel rail pressure relief valve is designed to release fuel pressure in the event of
an overpressure condition. This diagnostic looks for excessive fuel rail pressure decay to detect an open fuel rail pressure relief valve.
Conditions for Running the DTC
• | Fuel rail pressure is more than 189 MPa. |
• | This diagnostic runs continuously. |
Conditions for Setting the DTC
• | The stored fuel pressure deviation values, during three diagnostic events, are all above the calibrated limits. |
• | The sum of the stored fuel pressure deviation values are above the calibrated limits. |
• | One or two fuel pressure deviation values are above the calibrated limits and the fuel rail pressure valve is stuck in the open position. |
Action Taken When the DTC Sets
• | DTC P009E is a Type A DTC. |
• | The ECM commands the engine to operate in the Reduced Engine Power mode. |
• | A message center displays Reduced Engine Power |
Conditions for Clearing the DTC
DTC P009E is a Type A DTC.
Diagnostic Aids
• | Fuel level below 11 percent may cause this DTC to set. |
• | A restricted fuel filter, kinked or damaged fuel lines may cause this DTC to set. |
• | The valve will leak fuel into the fuel return system causing this DTC to set if the fuel pressure relief valve is not torqued correctly. Refer to
Fastener Tightening Specifications
. |
• | An intermittent electrical connection at the fuel rail pressure sensor may cause this DTC to set. |
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Circuit/System Testing
If any other DTCs are set other than DTC P009E, refer to
Diagnostic Trouble Code (DTC) List - Vehicle
.
- Remove the fuel pressure relief valve return hose and plug the hose to prevent fuel leakage.
- Install a section of rubber fuel hose on the fuel pressure relief valve connection and place loose end of hose into a clean fuel container.
| Important: Fuel that is contaminated with gasoline may cause permanent damage to the fuel pressure relief valve. Refer to
Contaminants-in-Fuel Diagnosis
.
|
• | If the engine cranks but does not start, crank the engine for 15 seconds. Observe for no fuel leaking from fuel pressure relief valve. |
• | If the engine starts and runs, idle the engine while commanding the fuel rail pressure to 180 MPa with a scan tool. Observe for no fuel leaking from fuel pressure relief valve. |
⇒ | If the fuel pressure relief valve tested normal, refer to Diagnostic Aids. |
Repair Instructions
Important: During code clearing, the ECM must be powered down. Power down is achieved by turning off the ignition key and waiting for loss of communication, indicating power down. The time to power down may vary from vehicle to
vehicle. After power down is achieved, turn the ignition key to the ON position and clear the trouble code using the scan tool clear code function and power down ECM. Repeat power down if the trouble code does not clear on first attempt.
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Fuel Pressure Relief Valve Replacement