Vauxhall Workshop Service and Repair Manuals

DTC P0252-P0254 - LPL or LPV

Diagnostic Instructions

DTC Descriptor

Diagnostic Fault Information

Circuit/System Description

The fuel pressure regulator is used to control the fuel pressure at the high pressure pump. The fuel pressure regulator is pulse width modulated (PWM). The engine control module (ECM) supplies the voltage directly to the fuel pressure regulator. The ECM controls the solenoid by grounding the control circuit with a solid state device called a driver.

Conditions for Running the DTC

Conditions for Setting the DTC

P0252 00

The ECM detects an overtemperature at the output control driver of the fuel pressure regulator or fuel pressure regulator stuck.

P0253

The ECM detects the fuel pressure regulator control circuit is shorted to ground for more than 1 second.

P0254

The ECM detects the fuel pressure regulator control circuit is shorted to voltage for more than 1 s.

Action Taken When the DTC Sets

DTCs P0252 00, P0253 and P0254 are type A DTCs.

Conditions for Clearing the DTC

DTCs P0252 00, P0253 and P0254 are type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. DTCs P0252 00, P0253 or P0254 should not set.
2. 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 OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.
2. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance.

3. Disconnect the X2 harness connector at the K20 Engine Control Module.
4. Ignition ON, test for less than 0.3 V between the signal circuit at the harness connector from G18 High Pressure Fuel Pump terminal 2 and ground.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

5. Ignition OFF, test for greater than 500 kΩ between the signal circuit terminal 2 and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

6. Test for less than 5 Ω between the signal circuit at the harness connector from G18 High Pressure Fuel Pump terminal 2 and the signal circuit at the K20 Engine Control Module terminal 5.

⇒	If greater than the specified range, test the signal circuit for an open circuit. If the circuit tests normal, replace the K20 Engine Control Module.

7. Inspect and repair one of the following conditions:

High Pressure

•	Restricted fuel return

•	Fuel injection pump stuck open

•	Fuel rail pressure regulator stuck closed

•	Restricted fuel injector

8. If all circuit tests normal, replace the G18 High Pressure Fuel Pump.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.