2010 Cadillac Truck SRX FWD V6-3.0L Page 1506

2010 Cadillac Truck SRX FWD 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.