P0453
DTC P0451-P0454 (LUJ)
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 provide an overview of each diagnostic category.
DTC Descriptors
DTC P0451
- Fuel Tank Pressure Sensor Performance
DTC P0452
- Fuel Tank Pressure Sensor Circuit Low Voltage
DTC P0453
- Fuel Tank Pressure Sensor Circuit High Voltage
DTC P0454
- Fuel Tank Pressure Sensor Circuit Intermittent
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The fuel tank pressure sensor measures air pressure or vacuum in the evaporative emission (EVAP) system. The engine control module (ECM) supplies a 5 V reference and a low reference circuit to the fuel tank pressure sensor. The fuel tank pressure sensor signal voltage varies depending on EVAP system pressure or vacuum. The ECM also uses this fuel tank pressure sensor signal to determine atmospheric pressure for use in the small leak test, DTC P0442.
Conditions for Running the DTC
P0451
* This diagnostic runs when the engine off natural vacuum small leak test, DTC P0442, is in progress.
* This diagnostic can be tested 2 times during the engine off period.
P0452 and P0453
* The average fuel level is between 6-40 L (0-10 gal).
* DTCs P0452 and P0453 run continuously when the ignition is ON.
P0454
* This diagnostic runs when the engine off natural vacuum small leak test, DTC P0442, is in progress.
* This diagnostic can be tested 1 time during the engine off period.
* The ECM does not detect a refueling event.
Conditions for Setting the DTC
P0451
DTC P0451 will set if the controller is unable to re-zero the fuel tank pressure sensor voltage within a calibrated range. The length of the test can be up to 10 min.
P0452
The fuel tank pressure sensor voltage is less than 0.15 V for more than 0.1 s.
P0453
The fuel tank pressure sensor voltage is more than 4.85 V for more than 0.1 s.
P0454
The ECM detects an abrupt change in the fuel tank pressure sensor voltage, other than a refueling event. The length of the test can be up to 10 min.
Action Taken When the DTC Sets
P0451 or P0454
DTCs P0451 and P0454 are Type A DTCs.
P0452 or P0453
DTCs P0452 and P0453 are Type B DTCs.
Conditions for Clearing the DTC
P0451 or P0454
DTCs P0451 and P0454 are Type A DTCs.
P0452 or P0453
DTCs P0452 and P0453 are Type B DTCs.
Diagnostic Aids
* A restriction in the EVAP canister or vent lines may prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the reset procedure may not complete successfully, which may cause this code to set.
* Ensure that the reference port on the fuel tank pressure sensor is unobstructed.
* Scan tool output controls, snapshot, and the plot function can help detect erratic sensor operation. To observe the fuel tank pressure sensor signal under vacuum conditions, use the quick snapshot and the EVAP purge/seal function to capture data while commanding purge to 20%. Then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor range by applying pressure with EN 41413-200 - Evaporative
Emissions System Tester while taking a snapshot with the scan tool.
Reference Information
Schematic Reference
Engine Controls Schematics (LUJ) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
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
Special Tools
EN 41413-200 - Evaporative Emissions System Tester
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Remove the fuel cap.
2. Ignition ON, engine OFF.
3. Observe the scan tool Fuel Tank Pressure Sensor parameter.
4. The Fuel Tank Pressure Sensor parameter should be 1.3-1.7 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector X401 Body Harness & Fuel Tank Harness.
2. Ignition OFF, ensure that the ECM completely powers down and test for less than 5 ohm between the X401 Body Harness & Fuel Tank Harness low reference circuit male side terminal L and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
3. Ignition ON, test for 4.8-5.2 V between the X401 Body Harness & Fuel Tank Harness 5 V reference circuit male side terminal H and ground.
• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
4. Verify the scan tool Fuel Tank Pressure Sensor parameter is less than 0.2 V.
• If greater than the specified range, test the X401 Body Harness & Fuel Tank Harness signal circuit male side terminal K for a short to voltage. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
5. Install a 3 A fused jumper wire at the X401 Body Harness & Fuel Tank Harness signal circuit male side terminal K and the 5 V reference circuit male side terminal H. Verify the scan tool Fuel Tank Pressure Sensor parameter is greater than 4.7 V.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
6. If all circuits test normal, replace the B47 Fuel Pressure Sensor and connect the harness connector at B47 Fuel Pressure Sensor.
7. Verify the DTC does not reset.
• If the DTC resets, replace the harness between X401 Body Harness & Fuel Tank Harness and B47 Fuel Pressure Sensor.
Repair Instructions
* For DTC P0452 00 or P0453 00, perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* For DTC P0451 00 or P0454 00, clear DTCs with a scan tool.
* Control Module References Control Module References ffor ECM replacement, programming and setup