Cruze

DTC P0088

The engine control module (ECM) uses commanded fuel pump flow to determine a desired fuel rail pressure. The ECM monitors fuel rail pressure with the fuel rail pressure sensor. The fuel pressure regulator solenoid is used to control the fuel pressure. The fuel pressure regulator solenoid is pulse width modulated (PWM). The ECM supplies the voltage directly to the fuel pressure regulator solenoid. The ECM controls the solenoid by grounding the control circuit with a solid state device called a driver.

The ECM detects that the rail pressure exceeds the maximum positive deviation of rail pressure.

DTC P0088 is a Type C DTC.

DTC P0088 is a Type C DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that no other DTCs are set.

⇒	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 P0087, or P0088 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.

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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.