DTC P0451-P0454 (LUJ)
Diagnostic Instructions
DTC Descriptors
| DTC P0451 00: Fuel Tank Pressure Sensor
Performance |
| DTC P0452 00: Fuel Tank Pressure Sensor
Circuit Low Voltage |
| DTC P0453 00: Fuel Tank Pressure Sensor
Circuit High Voltage |
| DTC P0454 00: Fuel Tank Pressure Sensor
Circuit Intermittent |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
High Resistance
|
Open
|
Short to Voltage
|
Signal Performance
|
Fuel Tank Pressure Sensor 5 V Reference
|
P0107 00, P0452 00, P0532 00, P0641 00
|
P0451 00
|
P0452 00
|
P0453 00, P0641 00
|
-
|
Fuel Tank Pressure Sensor Signal
|
P0452 00
|
P0451 00
|
P0452 00
|
P0453 00
|
P0451 00, P0454 00
|
Fuel Tank Pressure Sensor Low Reference
|
-
|
P0446 00, P0451 00
|
P0446 00
|
-
|
-
|
|
| |
Typical Scan Tool Data
Fuel Tank Pressure Sensor Voltage
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: Ignition ON,
Engine OFF
Parameter Normal Range: 1.3-1.7 V
|
Fuel Tank Pressure Sensor 5 V Reference
|
0 V
|
0-1.5 V
|
5 V
|
Fuel Tank Pressure Sensor Signal
|
0 V
|
0 V
|
5 V
|
Fuel Tank Pressure Sensor Low Reference
|
-
|
4.5 V
|
-
|
|
| |
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
00.
Conditions for Running the DTC
P0451 00
| • |
DTCs P0452 00, P0453 00, P0642
00, P0643 00 are not set. |
| • |
The engine has been running
for more than 10 s. |
| • |
The fuel tank pressure sensor
signal is between 0.2-4.9 V. |
| • |
The vehicle speed reached once
during drive cycle of 20 km/h (14.2 MPH). |
| • |
The evaporative emission
(EVAP) system has reached full purge and no purge once during drive
cycle. |
| • |
The EVAP system is
purging. |
| • |
DTC P0451 00 runs continuously
when the above conditions have been met. |
P0452 00 and P0453 00
| • |
DTCs P0642 00 and P0643 00 are
not set. |
| • |
The average fuel level is
between 6-40 L (0-10 gal). |
| • |
DTCs P0452 00 and P0453 00 run
continuously when the ignition is ON. |
P0454 00
| • |
DTCs P000A 00, P000B 00, P0010
00, P0013 00, P0016 00, P0017 00, P0030 00, P0031 00, P0032 00,
P011 001, P0112 00, P0113 00, P0114 00, P0117 00, P0118 00, P0119
00, P0121 00, P0122 00, P0123 00, P0131 00, P0132 00, P0133 00,
P0134 00, P0135 00, P0171 00, P0172 00, P0201 00, P0202 00, P0203
00, P0204 00, P0221 00, P0222 00, P0223 00, P0261 00, P0262 00,
P0264 00, P0265 00, P0267 00, P0268 00, P0270 00, P0271 00, P0300
00, P0301 00, P0302 00, P0303 00, P0304 00, P0335 00, P0336 00,
P0340 00, P0341 00, P0365 00, P0366 00, P0442 00, P0443 00, P0446
00, P0451 00, P0452 00, P0453 00, P0454 00, P0455 00, P0456 00,
P0458 00, P0459 00, P0496 00, P0498 00, P0499 00, P0500 00, P0501
00, P0506 00, P0507 00, P0562 00, P0563 00, P0601 00, P0602 00,
P0603 00, P0604 00, P0605 00, P0606 00, P0607 00, P061A 00, P0642
00, P0643 00, P2088 00, P2089 00, P2090 00, P2091 00, P2100 00,
P2101 00, P2119 00, P2176 00, P2297 00, P2301 00, P2304 00, P2307
00, P2310 00, and P2A00 00 are not set. |
| • |
The barometric pressure (BARO)
is more than 75 kPa (11 PSI). |
| • |
The engine coolant temperature
(ECT) sensor is less than 110°C (230°F). |
| • |
The vehicle speed is 0 km/h (0
MPH). |
| • |
The fuel level is between 6-40
L (2-10 gal). |
| • |
The fuel tank pressure sensor
is between -3 to +1 kPa (-0.4 to +0.1 PSI). |
| • |
The intake air temperature
(IAT) is between -8.25 to +70°C (+17 to +158°F).
|
| • |
The battery voltage is more
than 10 V. |
| • |
The engine is operating in
closed loop fuel control. |
| • |
DTC P045 004 runs once per
drive cycle when the above conditions have been met. |
Conditions for Setting the DTC
P0451 00
The maximum minus the minimum fuel tank pressure sensor signal
voltage is less than 0.039 V for 5 s.
P0452 00
The fuel tank pressure sensor voltage is less than 0.1 V for more
than 1 s.
P0453 00
The fuel tank pressure sensor voltage is more than 4.9 V for more
than 1 s.
P0454 00
The maximum minus the minimum fuel tank pressure is more than 0.1
kPa (0.02 PSI) for 5 s.
Action Taken When the DTC Sets
DTCs P045 001, P0452 00, P0453 00, and P0454 00 are Type B
DTCs.
Conditions for Clearing the DTC
DTCs P0451 00, P0452 00, P0453 00, and P045 004 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 (EEST) while taking a snapshot with the scan
tool. |
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EN 41413-200 Evaporative Emissions System Tester
(EEST)
For equivalent regional tools, refer to
Special Tools .
Circuit/System Verification
| 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 Ω 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 P0451 00 or P0454 00,
clear DTCs with a scan tool. |
|
