• 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:Evaporative Emission Control System Description

• DTC P0442=Running
• Ignition=Off

Frequency the DTC runs=2 times—After the running conditions are met

• DTC P1001, P1005, U18A2 = Not set
• Ignition=On

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

• DTC P0442=Running
• Ignition=Off
• Refueling Event Detected=No—For greater than 10 min

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

Fuel Tank Pressure Sensor=Not within a calibrated range

Fuel Tank Pressure Sensor=Less than 0.15 V—For greater than 10 s

Fuel Tank Pressure Sensor=Greater than 4.85 V—For greater than 10 s

Fuel Tank Pressure Sensor=Signal Erratic

• DTC P0451, P0454=Type A DTC
• DTC P0452, P0453=Type B DTC

• DTC P0451, P0454=Type A DTC
• DTC P0452, P0453=Type B DTC

• Do not replace K111 control module if only DTC P0451 is set.
• A restriction in the vent system could prevent fuel vapor pressure from bleeding off fast enough. If the pressure cannot bleed off fast enough a DTC sets.
• Ensure that the fresh air inlet, reference port, or vent of the component is clean, dry, and unobstructed:B150 Fuel Tank Pressure Sensor

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

• CH-48096 - EVAP Service Port Access Tool
• GE-41413-A / B / C - Evaporative Emissions System Tester (EEST)
• GE-41415-60 - Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter

Equivalent regional tools:Special Tools

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC P1176 is not set
• If the DTC is set

  Refer to:DTC P1176 or P1177

• If the DTC is not set
3. Verify with the customer the following did not exist:Poor fuel fill quality
• If a condition exists
1. Ignition/Vehicle » Off
2. Verify the condition does not exist with the component and repair as necessary:
1. Evaporative Emission Vent FilterorEvaporative Emission Canister Air Inlet Hose—Blocked/Dirty/Ice/Restricted/Visible Damage
2. Q13 Evaporative Emission Vent Solenoid Valve—Blocked/Restricted/Visible Damage
3. Evaporative Emission Canister Vent HoseorPipe—Blocked/Kinked/Restricted/Visible Damage
4. Evaporative Emission Canister—Restricted/Visible Damage
5. Evaporative Emission Hose—Kinked/Restricted/Visible Damage
6. Evaporative Emission Pipe—Kinked/Restricted/Visible Damage
• If no condition exists
4. Verify the following conditions do not exist:
• Evaporative Emission Canister—Restricted/Visible Damage
• Evaporative Emission Hose—Kinked/Restricted/Visible Damage
• Evaporative Emission Pipe—Kinked/Restricted/Visible Damage
• If a condition exists

  Repair or replace as necessary

• If no condition exists
5. Disconnect the component:Quick Connect Fitting@Q12 Evaporative Emission Purge Solenoid Valve
6. Install»CH-48096 - EVAP Service Port Access Tool—Between:Evaporative Emission Canister Purge Tube&Q12 Evaporative Emission Purge Solenoid Valve
7. Install»GE-41413-A / B / C - Evaporative Emissions System Tester (EEST)—Hose@CH-48096 - EVAP Service Port Access Tool
8. Ignition » On / Vehicle » In Service Mode
9. Perform the following action:
1. Perform the scan tool function:Evaporative Emission Canister Vent Valve»Not Venting
2. Select»Nitrogen@GE-41413-A / B / C - Evaporative Emissions System Tester (EEST)
3. Press and release the switch:Remote Switch@GE-41413-A / B / C - Evaporative Emissions System Tester (EEST)—Special Tool=OnorActivated

   Use the tool to achieve a gauge reading of 9.3 mmHg (5.0 in H2O)

4. Verify the scan tool parameter:Fuel Tank Pressure Sensor&Gauge@GE-41413-A / B / C - Evaporative Emissions System Tester (EEST)=Within 1.9 mmHg (1.0 in H2O) of each other
• If not within 1.9 mmHg (1.0 in H2O) of each other

  Replace the component:B150 Fuel Tank Pressure Sensor

• If within 1.9 mmHg (1.0 in H2O) of each other
10. Perform the scan tool function:Evaporative Emission Canister Vent Valve»Venting

    Verify the scan tool parameter:Fuel Tank Pressure Sensor=-1.9 to 1.9 mmHg (−1.0 to 1.0 in. H2O)—Within 3 s

• If not between -1.9 to 1.9 mmHg (-1.0 to 1.0 in. H2O)orDoes not decrease within the specified time
1. Ignition/Vehicle » Off
2. Verify the condition does not exist with the component and repair as necessary:
• Evaporative Emission Canister—Incorrect connection/Restricted/Visible Damage
• Evaporative Emission Hose—Defective/Incorrect connection/Kinked/Restricted/Visible Damage
• Evaporative Emission Pipe—Defective/Incorrect connection/Kinked/Restricted/Visible Damage
• If between -1.9 to 1.9 mmHg (-1.0 to 1.0 in. H2O)&Decreases within the specified time
11. Perform the following action:
• {Cap Type Fuel Fill}Remove»Fuel Tank Filler Cap
• {Capless Type Fuel Fill}Install»GE-41415-60 - Engine Induction System Leak Test Adapter/Capless Fuel Fill Adapter@Door@Fuel Tank Filler Pipe
12. Ignition » On / Vehicle » In Service Mode
13. Verify the scan tool parameter:Fuel Tank Pressure Sensor=1.3 to 1.7 V
• If not between 1.3 and 1.7 V

  Refer to: Circuit/System Testing

• If between 1.3 and 1.7 V
14. Verify the scan tool parameter:Fuel Tank Pressure Sensor=The parameter value should not change

    Perform the action while monitoring the parameter:

• Wiggle the harness and connector(s):B150 Fuel Tank Pressure Sensor
• Wiggle the harness and connector(s):K111 Fuel Pump Driver Control Module
• If the parameter value changes

  Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)

• If the parameter value does not change
15. 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
16. All OK.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:B150 Fuel Tank Pressure Sensor
3. Test for less than 5 Ω between the test points:Low Reference circuit terminal 2&Ground
• If 5 Ω or greater
1. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 2@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K111 Fuel Pump Driver Control Module
• If less than 5 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Test for 4.8 to 5.2 V between the test points:5 V Reference circuit terminal 3&Low Reference circuit terminal 2
• 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:5 V Reference circuit terminal 3@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance
4. Test for less than 2 Ω between the test points:5 V Reference circuit terminal 3@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » 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:5 V Reference circuit terminal 3@Component 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. Verify the scan tool parameter:Fuel Tank Pressure Sensor=Less than 0.2 V
• If 0.2 V or greater
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:Signal circuit terminal 1@Component 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 less than 0.2 V
7. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 1&5 V Reference circuit terminal 3
8. Verify the scan tool parameter:Fuel Tank Pressure Sensor=Greater than 4.7 V
• If 4.7 V or less
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect the electrical connector:K111 Fuel Pump Driver Control Module
3. Test for infinite resistance between the test points:Signal circuit terminal 1@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance
4. Test for less than 2 Ω between the test points:Signal circuit terminal 1@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K111 Fuel Pump Driver Control Module
• If greater than 4.7 V
9. Test or replace the component:B150 Fuel Tank Pressure Sensor

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

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