• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Fuel System Description

• DTC U0076 = Not set
• Ignition=On
• Ignition Voltage=Greater than 11 V

Frequency the DTC runs=Continuously—After the running conditions are met

5V Reference Circuit=Less than 4.88 VorGreater than 5.13 V—For greater than 1 s

DTCs listed in the DTC Descriptor category=Type A DTC

DTCs listed in the DTC Descriptor category=Type A DTC

Engine Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify the scan tool parameter:
• { P1176 }Fuel Pump Driver Control Module 5V Reference 1=4.8 to 5.2 V
• { P1177 }Fuel Pump Driver Control Module 5V Reference 2=4.8 to 5.2 V
• If not the specified value

  Refer to: Circuit/System Testing

• If the specified value
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

   Verify the DTC does not set.

• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC is not set
4. All OK.

1. Ignition/Vehicle » Off

Note: Additional DTCs will set when disconnecting the components.

2. Disconnect the electrical connector at one of the following components, depending on the DTC that is set:
• { P1176 }B150 Fuel Tank Pressure Sensor
• { P1177 }B47 Fuel Pressure Sensor—If the device is supplied with power—K111 Fuel Pump Driver Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Verify the scan tool parameter:
• { P1176 }Fuel Pump Driver Control Module 5V Reference 1=5.01 V
• { P1177 }Fuel Pump Driver Control Module 5V Reference 2=5.01 V
• If not the specified state after disconnecting a component from the circuit

  Test or replace the component:The component that was disconnected last.

• If the specified state after disconnecting a component from the circuit
5. Test for 4.8 to 5.2 V between the test points:
• { P1176 }5 V Reference circuit terminal 3@Component harness&Ground
• { P1177 }5 V Reference circuit terminal 1@Component harness&Ground
• If less than 4.8 V
1. Ignition/Vehicle » Off
2. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
3. Test for infinite resistance between the test points:
• { P1176 }5 V Reference circuit terminal 10@Control module harness&Ground
• { P1177 }5 V Reference circuit terminal 12@Control module harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:K111 Fuel Pump Driver Control Module
• If greater than 5.2 V
1. Ignition/Vehicle » Off
2. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:
• { P1176 }5 V Reference circuit terminal 10@Control module harness&Ground
• { P1177 }5 V Reference circuit terminal 12@Control module harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K111 Fuel Pump Driver Control Module
• If between 4.8 and 5.2 V
6. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Fuel Tank Pressure Sensor Replacement—B150 Fuel Tank Pressure Sensor
• For control module replacement, programming, and setup refer to:Control Module References