P228C

DTC P0089, P00C6, P228C, or P228D (LF1, LFW)

Diagnostic Instructions

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

DTC Descriptors
DTC P0089
- Fuel Pressure Regulator Performance

DTC P00C6
- Fuel Rail Pressure Low During Engine Cranking

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

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

Circuit/System Description

The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.

High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump actuator is a solenoid valve. The ECM provides a voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground.

The high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail.

The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.

Conditions for Running the DTC

P0089, P228C, or P228D
* DTC P0090, P0091, P0092, P0191, P0192, or P0193 is not set.
* The ignition voltage is less than 18 V.
* The deceleration fuel cut-off (DFCO) is inactive.
* The engine speed is greater than 25 RPM.
* The air bag is not deployed.
* The DTCs run continuously when the above conditions are met for 5 s.

P00C6
* DTC P0090, P0091, P0092, P00C8, P00C9, P00CA, P0116, P0117, P0118, P0128, P0192, P0193, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, P0391, P0627, P0628, P0629 are not set.
* The ignition voltage is more than 8 V.
* The engine coolant temperature is between -100 and +65°C (-148 and +149°F).
* The low side fuel pressure is more than 0 kPa (0 psi).
* The engine is not running.
* The DTC runs once for each engine start.

Conditions for Setting the DTC

P0089

The high pressure fuel pump actuator command necessary to maintain the desired fuel rail pressure is +/-2.5 MPa (363 psi) of the command expected by the controller. The condition exists for greater than 5 s.

P00C6

The ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.

P228C

The actual fuel rail pressure is 1.5 MPa (218 psi) less than the desired fuel pressure. The condition exists for greater than 5 s.

P228D

The actual fuel rail pressure is 3.6 MPa (522 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 s.

Action Taken When the DTC Sets

* DTCs P0089 and P00C6 are Type B DTCs.
* DTCs P228C and P228D are Type A DTCs.
* A message center or an indicator displays Reduced Engine Power.

Conditions for Clearing the DTC

* DTCs P0089 and P00C6 are Type B DTCs.
* DTCs P228C and P228D are Type A DTCs.

Diagnostic Aids

* A restricted fuel feed pipe between the fuel feed pipe fuel pressure sensor and the high pressure fuel pump may set a DTC.
* A condition with the fuel tank fuel pump module or fuel pump flow control module may set a DTC.
* A skewed fuel rail pressure sensor, or an intermittent condition in the fuel rail pressure sensor circuits may set a DTC.
* A leaking or restricted fuel injector may set a DTC.
* A short to voltage in the crankshaft position signal circuit may set a DTC.
* A short to voltage in the camshaft position actuator solenoid valve control circuit may set a DTC.

Reference Information
Schematic Reference

Engine Controls Schematics (LAU) ([1][2]Electrical Diagrams)Engine Controls Schematics (LF1) ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Fuel System Description (LF1) (Fuel System Description)Fuel System Description (LAU or LY7) (Fuel System Description)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P0627, P0628, P0629, P069E, or U0109 should not set.

• If a DTC is set refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Attempt to start and idle the engine.
3. Observe the DTC information with a scan tool. DTCs P0089, P00C6, P228C, and P228D should not set.
4. Engine idling, observe the Fuel Rail Pressure Sensor parameter with a scan tool. The pressure should be approximately 1.9-2.1 Mpa (279-305 psi).
5. Command an increase and decrease in Fuel Pressure with a scan tool. Observe the scan tool Fuel Rail Pressure Sensor parameter. The Fuel Rail Pressure Sensor parameter should increase or decrease with each commanded state.
6. 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

Note: Circuit/System Verification must be performed first or misdiagnosis may result.

1. Ignition ON, observe the scan tool Fuel Pump Control Module Fuel Pressure Sensor parameter. Command an increase in Fuel Pressure with a scan tool. Verify the Fuel Pressure Sensor parameter increases to greater than 414 kPa (60 psi) as commanded.

• If less than the specified range, refer to Fuel System Diagnosis (LF1 China) (Fuel System Diagnosis (China))Fuel System Diagnosis (LF1 Except China) (Fuel System Diagnosis (Except China))Fuel System Diagnosis (LAU China) (Fuel System Diagnosis (China))Fuel System Diagnosis (LAU Except China) (Fuel System Diagnosis (Except China)).

Note: As little as 2 ohm on either circuit of the high pressure fuel pump actuator will cause these DTCs to set. Test the circuits of the high pressure fuel pump actuator for a high resistance if you suspect a condition.

2. Remove the G18 high pressure fuel pump and visually inspect the lobes on the camshaft for unusual wear.

• If the lobes appear normal, replace the G18 high pressure fuel pump.
• If the lobes are worn, replace the camshaft.

Component Testing
Static Test

1. Ignition OFF, disconnect the harness connector at the G18 high pressure fuel pump.

Note: The DMM and test leads must be calibrated to 0 ohm in order to prevent misdiagnosis.

2. Test for 10 ohm plus/minus 1 ohm at 25°C (77°F) between the low control circuit terminal 1 and the high control circuit terminal 2.

• If not within the specified range, replace the G18 high pressure fuel pump.

3. Test for infinite resistance between each terminal and the G18 high pressure fuel pump housing.

• If not the specified value, replace the G18 high pressure fuel pump.

Repair Instructions

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

* Camshaft Replacement - Right Side (Camshaft Replacement - Right Side)
* Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail (Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail)
* Fuel Pump Replacement (Fuel Pump Replacement)