Captiva

DTC P0089, P00C6, P228C, or P228D

The high fuel pressure necessary for direct injection is supplied by the high pressure fuel pump. The pump is mounted on the rear of the engine and is driven by a three-lobe cam on the Bank 2 exhaust camshaft. This pump also regulates the fuel pressure using an actuator in the form of an internal solenoid-controlled valve. In order to keep the engine running efficiently under all operating conditions, the engine control module (ECM) requests pressure ranging from 2 to 15 MPa (290 to 2176 psi), depending on engine speed and load. Output drivers in the ECM provide the pump control circuit with a 12 V pulse-width modulated (PWM) signal, which regulates fuel pressure by closing and opening the control valve at specific times during pump strokes. This effectively regulates the portion of each pump stroke that is delivered to the fuel rail. When the control solenoid is NOT powered, the pump operates at maximum flow rate. In the event of pump control failure, the high pressure system is protected by a relief valve in the pump that prevents the pressure from exceeding 17.5 MPa (2538 psi).

The fuel rail fuel pressure sensor provides the feedback necessary to the ECM to control the pump and the injectors. This sensor is diagnosed separately from the fuel pressure control system.

The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressures are within a predetermined range during engine cranking and at all times while the engine is running. The ECM also monitors the fuel pump actuator to make sure it is operating within expected limits.

P0089, P228C, or P228D

P00C6

P0089

The high pressure fuel pump has exceeded it's control limits. This condition exists when the high pressure fuel pump actuator command is 0 ° or greater than 240 °. The condition exists for greater than 10 s.

P00C6

The ECM detects that the fuel rail pressure is not rising greater than 3 MPa (435 psi) or has fallen below 2 MPa (290 psi) during engine cranking, depending on initial pressure when cranking begins.

P228C

The actual fuel rail pressure is 3 MPa (435 psi) less than the desired fuel rail 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.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description : LF1

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Attempt to start and idle the engine.
2. Observe the DTC information with a scan tool. DTCs P0089, P00C6, P228C, and P228D should not set.

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

3. 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).
4. 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.

Warning: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any manoeuvres that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

5. Road test the vehicle and perform a wide open acceleration from a stop until the transmission shifts into second gear. On manual gearbox applications, shift to second gear or stop the test near 7000 RPM. Repeat the test at least three times. DTCs P0089, P228C, and P228D should not set.
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.

Warning: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any manoeuvres that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.

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

1. Road test the vehicle and perform a wide open acceleration from a stop until the transmission shifts into second gear. On manual gearbox applications, shift to second gear or stop the test near 7000 RPM. Repeat the test at least three times. Observe the scan tool Fuel Rail Pressure Sensor parameter during the test. Near 7000 RPM the Fuel Rail Pressure Sensor parameter should reach 14-17 MPa (2031-2466 psi).

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

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.

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 Ω in order to prevent misdiagnosis.

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.

⇒	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.

Perform the Diagnostic Repair Verification