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

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

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 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 high fuel pressure which is required for direct injection is achieved by a high-pressure pump. The pump is mounted on the rear section of the engine and is driven by a cam lobe on the 2nd exhaust camshaft. This pump regulates the fuel pressure by means of a solenoid valve.

In order for the engine to operate effectively in all driving conditions the engine control unit (ECU) makes sure of requesting a pressure range of between 2 to 15 MPa (290 to 2176 psi), depending on engine speed and load. The output signals in the control module (ECM) supply the pump with a 12 V power pulse signal (PWM), which regulates the fuel pressure by closing or opening the control valve at specified time intervals during the pump cycle.

This effectively regulates the quantity of fuel that is distributed to each fuel nozzle. When the solenoid is NOT energized, the pump operates with maximum fuel supply. In the case where the control module's signals to the pump are not operative, the high-pressure system is protected by a check valve in the pump which prevents pressure from exceeding 17.5 MPa (2538 psi).

The pressure sensor for the fuel nozzles provides the control module (ECM) with sufficient information to control the pump and nozzles. This sensor is diagnosed separately from the fuel pressure control system. The control module (ECM) monitors the pressure sensor for the fuel nozzles as well as the high pressure pump in order to determine whether the recommended and actual pressure are within the predefined range during starting and during the whole time that the engine is running. The control module (ECM) also monitors the fuel pump sensor to ensure that it operating within the expected range.

Conditions for Running the DTC


P0089, P228C, or P228D

• DTCs P0016, P0017, P0018, P0019, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0111, P0112, P0113, P0116, P0117, P0118, P0128, P0192, P0193, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, P0391, P0627, P0628 or P0629 are not activated.

• The ignition voltage is more than 8 V.

• The low side fuel pressure is more than 275 kPa (40 psi).

• Engine is running

• The DTCs run continuously when the above conditions are met for 10 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 lower than 65°°C (149°F).

• The low side fuel pressure is more than 300 kPa (44 psi).

• Diagnostics are run once each time the engine is started.


Conditions for Setting the DTC

P0089

The fuel pump has exceeded its control level. This occurs when the pump's sensors indicate 0° or greater than 240°. The condition exists for longer than 10 s.

P00C6

The ECM registers that the pressure in the fuel rail does not increase to more than 3 MPa (435 psi) or fall below 2 MPa (290 psi).

P228C

The actual fuel rail pressure is 3 MPa (435 psi) lower than the desired pressure. The condition exists for greater than 10 s.

P228D

The actual fuel rail pressure is 3 MPa (435 psi) greater than the desired fuel rail pressure. The condition exists for greater than 10 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 centre or an indicator shows reduced engine power for P228C and P228D.


Conditions for Clearing the DTC


• DTCs P0089 and P00C6 are Type B DTCs.

• DTCs P228C and P228D are Type A DTCs.


Diagnostic support


• A leakage in the fuel pressure system may cause a DTC.

• An defective valve, piston or solenoid valve in the high pressure pump may cause a DTC. A fault in the high pressure pump can almost certainly not be detected just by looking at it.

• A defective fuel pipe between the high-pressure pump and the pressure sensors for the fuel nozzles may cause a DTC.

• Problems with Bank 2 exhaust cam nay generate a fuel pressure DTC due to the location and design of the fuel pump. If DTC P0019 or P0391 is shown or appears in the history then the root cause may be a camshaft sensor.

• A leaking or faulty fuel injector can cause DTC P0089.

• For DTC P00C6, park the vehicle outside overnight and start it next morning.

• A power failure to the camshaft position sensor may cause a DTC.

• These DTCs can be caused by as little as 2 Ω on each circuit on the high-pressure pump's actuator. Check whether the high-pressure pump's actuator has high resistance if you suspect a fault.


Reference Information

Schematic Reference

Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description (LF1) Fuel System Description (LAU or LY7)

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

Circuit/System Verification


1. Attempt to start the vehicle and run the engine at idling speed.

2. Note the DTC information with a diagnostic tool. DTCs P0089, P00C6, P228C, and P228D should not generated.

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

4. Attempt to start and idle the engine.

5. Check the DTC information with a diagnostic tool. DTCs P0089, P00C6, P228C, and P228D should not generated.

6. Engine idling, observe the Fuel Rail Pressure Sensor parameter with a scan tool. The pressure should be approximately 1.9-5.0 Mpa (276-725 psi).

7. 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.

8.
Warning

Road test a vehicle under safe conditions while following all traffic regulations. Do not attempt any maneuvers that could jeopardize progress. Failure to follow these safety precautions may lead to personal injury and damage to the vehicle.


Road test the vehicle and accelerate from stationary until second gear is engaged. On manual gearboxes, change to second gear or stop the test in the vicinity of 7000 RPM. Repeat the test at least 3 times. DTCs P0089, P228C, and P228D should not set.

9. 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.
Warning

Road test a vehicle under safe conditions while following all traffic regulations. Do not attempt any maneuvers that could jeopardize progress. Failure to follow these safety precautions may lead to personal injury and damage to the vehicle.


Note

Circuit/system checking must be carried out first otherwise incorrect diagnosis may arise.


Road test the vehicle and accelerate from stationary until second gear is engaged. On manual gearboxes, change to second gear or stop the test in the vicinity of 7000 RPM. Repeat the test at least 3 times. Note the fuel pipe's fuel pressure sensor parameters during the test. At approx. 7000 RPM the fuel pipe's pressure sensor should reach 14-17 MPa (2031-2466 psi).

2. If the value is not reached then replace the G18 high-pressure pump.

3. Remove the G18 fuel pump and inspect the lobes on the camshaft for abnormal wear.

4. If the lobes appear normal, replace the G18 fuel pump.

5. 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.

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

Note

The DMM and test leads must be calibrated to 0 Ω in order to prevent misdiagnosis.


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

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

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


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Camshaft Replacement - Left Side

• Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail

• Fuel Pump Replacement