2010 Cadillac Truck SRX AWD V6-3.0L Page 1506
DTC P0452
- Fuel Tank Pressure Sensor Circuit Low Voltage
DTC P0453
- Fuel Tank Pressure Sensor Circuit High Voltage
DTC P0454
- Fuel Tank Pressure Sensor 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 5V 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 controller also uses this fuel tank pressure signal to determine atmospheric pressure for use in the
engine-off small leak test, DTC P0442. Before using this signal as an atmospheric reference it must first be re-zeroed.
Conditions for Running the DTC
P0451
* DTC P0451 runs only when the engine-off natural vacuum small leak test, P0442, executes.
* The number of times this test runs can range from 0-2 per engine-off period. The length of the test can be up to 10 minutes.
P0452 and P0453
DTC P0452 and P0453 run continuously when the ignition is ON.
P0454
* DTC P0454 runs only when the engine-off natural vacuum small leak test, P0442, executes.
* This test can run once per engine-off period. The length of the test can be up to 10 minutes.
* A refueling event is not detected.
Conditions for Setting the DTC
P0451
This DTC will set if the controller is unable to re-zero the fuel tank pressure sensor voltage within a calibrated range during the engine-off small
leak test, P0442.
P0452
The fuel tank pressure sensor voltage is less than 0.1V for more than 5 seconds.
P0453
The fuel tank pressure sensor voltage is more than 4.9V for more than 5 seconds.
