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DTC P228C or P228D

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 provides an overview of each diagnostic category.

DTC Descriptors

DTC P228C 00: Fuel Pressure Regulator 1 Control Performance - Low Pressure

DTC P228D 00: Fuel Pressure Regulator 1 Control Performance - High Pressure

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Ignition

P0091 00

P0091 00

-

-

Output Control

P0091 00

P0090 00

P0092 00

-

Circuit/System Description

The fuel pressure regulator solenoid is used to control the fuel pressure from the high pressure fuel pump to the fuel rail. The fuel pressure regulator solenoid is pulse width modulated (PWM). An ignition voltage is supplied to the fuel pressure regulator solenoid. The ECM controls the solenoid by grounding the control circuit with a solid state device called a driver.

Conditions for Running the DTC
    • The ignition is ON or the engine is running.
    • The ignition voltage is less than 16 V.
    • The DTC runs continuously once the above conditions are met.

Conditions for Setting the DTC

P228C 00

The actual fuel rail pressure is more than 11 MPa (1 595 PSI) below the desired fuel rail pressure for more than 8 s.

P228D 00

The actual fuel rail pressure is more than 20 MPa (2 900 PSI) above the desired fuel rail pressure for more than 8 s.

Action Taken When the DTC Sets

DTCs P228C 00, and P228D 00 are Type C DTCs.

Conditions for Clearing the DTC

DTCs P228C 00, and P228D 00 are Type C DTCs.

Diagnostic Aids

P228C

       Note: If the Change Fuel Filter Warning light is ON with DTC P228C, inspect the fuel filter for a restriction or contamination.

    • A restricted fuel supply line, a leakage in the high pressure section, too much or too little fuel in the low pressure line may cause DTCs to set. When ambient temperatures are below 0°C (32°F), the fuel tank pickup screen may be iced over from water in the fuel tank. A restricted, kinked, or damaged fuel supply line may cause DTC P0087 to set.
    • High resistance in either circuit of the fuel pressure regulator will cause a DTC to set.
    • There are no driveability concerns associated with the fuel rail pressure regulator unless a DTC is present. One of the causes of these DTCs is a sticking fuel rail pressure regulator.
    • If the fuel system pressure is actually too high, a fuel knock and smoke condition will exist.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EN 34730-1A Fuel Pressure Gauge

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification
  1. Ignition ON, observe the DTC information with a scan tool. Verify that no other DTCs are set.
    2. ⇒If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  2. Engine running, observe the scan tool DTC information parameter. DTCs P228C 00, or P228D 00 should not set.
  3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Circuit/System Testing
  1. Ignition ON, command the fuel pump ON and OFF with a scan tool. Verify the fuel pump turns ON.
    2. ⇒If the fuel pump does not turn ON, refer to Fuel Pump Electrical Circuit Diagnosis for further diagnosis.
  2. Ignition OFF, install the EN 34730-1A Fuel Pressure Gauge.
  3. Ignition ON, verify the fuel pressure is between 414-550 kPa (60-80 PSI).
    4. ⇒If not within the specified range, refer to Fuel System Diagnosis for further diagnosis.
  4. Ignition OFF, disconnect the harness connector at the Q18 Fuel Pressure Regulator.
  5. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 2 and ground.
    6. ⇒If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance.
  6. Ignition ON, test for 3-4 V between the control circuit terminal 1 and ground.
    7. ⇒If less than the specified range, test the control circuit for an open or a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
    ⇒If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  7. Inspect and repair one of the following conditions:

    8. Low Pressure

    • A fuel system leak
    • Restricted fuel filter
    • Injection nozzle stuck in open position
    • Leakage in the fuel rail pressure regulator
    • Worn fuel injection pump

    High Pressure

    • Restricted fuel return
    • Fuel injection pump stuck open
    • Fuel rail pressure regulator stuck closed
    • Restricted fuel injector
  8. If all circuits test normal, replace the Q18 Fuel Pressure Regulator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Fuel Injection Pump Replacement
    •  Fuel Injector Replacement
    • Control Module References for ECM replacement, setup, and programming
   


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