P009E

DTC P009E

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provide an overview of each diagnostic category.

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

* Engine is running.
* 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
OR
* The sum of the stored fuel pressure deviation values are above the calibrated limits
OR
* 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 control module 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

* The most likely cause of this code setting intermittently is the fuel pressure relief valve.
* A restricted fuel filter may cause this DTC to set.
* Fuel level below 11 percent may cause this DTC to set.

Circuit/System Testing

If any other DTCs are set other than DTC P009E, Refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions

1. Remove the fuel pressure relief valve return hose and plug the hose to prevent fuel leakage.
2. 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. 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 fuel leaks from the fuel pressure relief valve, replace the pressure relief valve. Refer to Fuel Pressure Relief Valve Replacement.

* 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 fuel leaks from the fuel pressure relief valve, replace the pressure relief valve. Refer to Fuel Pressure Relief Valve Replacement.

• If the circuits test normal, go to Diagnostic Aids.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Fuel Pressure Relief Valve Replacement