Wednesday, March 25, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1423

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1423



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 (FTP) sensor is only used for EVAP system diagnostics. The FTP sensor is a transducer that varies resistance according to changes in



the fuel tank pressure. The engine control module (ECM) monitors the FTP 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 FTP sensor.



Conditions for Running the DTC



* The engine is operating.



* The DTCs run continuously once the above conditions are met for 10 seconds.



Conditions for Setting the DTC



P0452



The ECM detects the FTP sensor signal voltage is less than 0.20 volt for 4 seconds, or a cumulative of 30 seconds.



P0453



The ECM detects the FTP 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



DTC P0452 and P0453 are Type B DTCs.



Diagnostic Aids



If a shared 5-volt reference circuit is shorted to ground or shorted to a voltage, other 5-volt reference circuits may be affected.



Reference Information



Schematic Reference



Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics



(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)



Electrical Information Reference

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