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P00C8





DTC P0090-P0092, P00C8, P00C9, or P00CA

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 P0090
- Fuel Pressure Regulator Control Circuit

DTC P0091
- Fuel Pressure Regulator Control Circuit Low Voltage

DTC P0092
- Fuel Pressure Regulator Control Circuit High Voltage

DTC P00C8
- Fuel Pressure Regulator High Control Circuit

DTC P00C9
- Fuel Pressure Regulator High Control Circuit Low Voltage

DTC P00CA
- Fuel Pressure Regulator High Control Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

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 engine control module (ECM) provides battery 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 ECM monitors the voltage on the circuits to detect a failure.

Conditions for Running the DTC

* The ignition voltage is greater than 11 V.

* The engine speed is greater than 50 RPM.

* The DTCs run continuously within the enabling conditions.

Conditions for Setting the DTC

P0090

* The ECM detects an open circuit in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P0091

* The ECM detects a short to ground in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P0092

* The ECM detects a short to voltage in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P00C8

* The ECM detects an open circuit in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

P00C9

* The ECM detects a short to ground in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

P00CA

* The ECM detects a short to voltage in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

Action Taken When the DTC Sets

* DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.

* A message center or an indicator displays Reduced Engine Power.

Conditions for Clearing the DTC

DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Fuel System Description 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 Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify DTC P0090, P0091, P0092, P00C8, P00C9, P00CA, P0685, or P1682 is not set.

• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

• If none of the DTCs are set

3. Command the Fuel Pressure Regulator ON and OFF with a scan tool while observing the following control circuit status parameters:

* Fuel Pressure Regulator Control Circuit High Voltage Test Status

* Fuel Pressure Regulator Control Circuit Open Test Status

* Fuel Pressure Regulator Control Circuit Low Voltage Test Status

* Fuel Pressure Regulator High Control Circuit High Voltage Test Status

* Fuel Pressure Regulator High Control Circuit Open Test Status

* Fuel Pressure Regulator High Control Circuit Low Voltage Test Status

• If Malfunction is displayed
Refer to Circuit/System Testing.

• If OK or Not Run is displayed

4. 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.

5. Verify the DTC does not set.

• If the DTC sets
Refer to Circuit/System Testing

• If the DTC does not set

6. All OK

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the G18 High Pressure Fuel Pump.

2. Ignition ON, verify that a test lamp does not illuminate between the high control circuit terminal 1 and ground and the low control circuit terminal 2 and ground.

• If the test lamp illuminates

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.

2. Test for less than 1 V between the appropriate control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K20 Engine Control Module.

• If the test lamp does not illuminate

3. Verify that a test lamp does not illuminate between the high control circuit terminal 1 and B+ and the low control circuit terminal 2 and B+.

• If the test lamp illuminates

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the appropriate control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If the test lamp does not illuminate

4. Connect a 3 A fused jumper wire between the high control circuit terminal 1 and ground.

5. Verify the Fuel Pressure Regulator High Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator High Control Circuit Low Voltage Test Status transitions from OK to Malfunction.

• The parameters do not change

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the high control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• The parameters change

6. Connect a 3 A fused jumper wire between the low control circuit terminal 2 and B+.

7. Verify the Fuel Pressure Regulator Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator Control Circuit High Voltage Test Status transitions from OK to Malfunction.

• The parameters do not change

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the low control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• The parameters change

8. Test or replace the G18 high pressure fuel pump.

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 ohms in order to prevent misdiagnosis.

2. Test for 0.46-0.51 ohms between the high control circuit terminal 1 and the low control circuit terminal 2.

• If not between 0.46-0.51 ohms
Replace the G18 high pressure fuel pump.

• If between 0.46-0.51 ohms

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

• If less than infinite resistance
Replace the G18 high pressure fuel pump.

• If infinite resistance

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Fuel Pump Replacement Fuel Pump Replacement

* Control Module References Control Module References for K20 Engine Control Module replacement, setup, and programming

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