2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1365
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0452
- Fuel Tank Pressure Sensor Circuit Low Voltage
DTC P0453
- Fuel Tank Pressure Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The evaporative emission (EVAP) system is used to store fuel vapors in order to reduce the amount of fuel vapors into the atmosphere. The fuel
tank pressure sensor is only used for EVAP system diagnostics. The fuel tank pressure sensor is a transducer that varies resistance according to
changes in the fuel tank pressure. The engine control module (ECM) monitors the fuel tank pressure sensor signal in order to detect vacuum decay
and excess vacuum during the EVAP system diagnostic test. The ECM supplies a 5-volt reference and a low reference circuit to the fuel tank
pressure sensor.
Conditions for Running the DTC
* The engine is operating.
* The DTCs run continuously once the above conditions are met for 14 seconds, 10 seconds for LLT.
Conditions for Setting the DTC
P0452
The ECM detects the fuel tank pressure sensor signal voltage is less than 0.12 volt for 4 seconds, or a cumulative of 30 seconds.
P0453
The ECM detects the fuel tank pressure sensor signal voltage is greater than 4.85 volts for 4 seconds, or a cumulative of 30 seconds.
Action Taken When the DTC Sets
DTC P0452 and P0453 are Type B DTCs.
Conditions for Clearing the MIL/DTC
