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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1365

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

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