Wednesday, April 13, 2022

2010 Cadillac Truck SRX FWD V6-3.0L Page 1511

2010 Cadillac Truck SRX FWD V6-3.0L Page 1511



* Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service



and Repair)



* For DTC P0452 or P0453, always perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic



procedure.



* For DTC P0451 or P0454, clear DTCs with a scan tool.



* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming



P0455



DTC P0455 (LF1)



Diagnostic Instructions



* 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 Descriptor



DTC P0455



- Evaporative Emission System Large Leak Detected



Circuit/System Description



The ECM tests the evaporative emission (EVAP) system for a large leak or restrictions to the purge path in the evaporative emission system. When



the enabling criteria has been met the ECM commands the EVAP canister vent solenoid valve ON and the EVAP canister purge solenoid valve ON,



allowing vacuum into the evaporative emission system. The ECM monitors the fuel tank pressure sensor voltage to verify that the system is able to



reach a predetermined level of vacuum within a set amount of time.



Conditions for Running the DTC



* Before the ECM can report DTC P0455 failed, DTC P0496 must run and pass.



* DTCs P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0442, P0443, P0449, P0451,



P0452, P0453, P0454, P0464, P0496, P0608, P0609, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128,



P2135, P2138 are not set.



* The ignition voltage is between 11-18 V.



* The barometric pressure (BARO) is more than 74 kPa.



* The fuel level is between 10-90 percent.



* The engine coolant temperature (ECT) at start-up is less than 35掳C (95掳F).



* The intake air temperature (IAT) is between 4-30掳C (39-86掳F).



* DTC P0455 runs once per cold start when the above conditions are met.



Conditions for Setting the DTC



The EVAP system is not able to achieve or maintain a calibrated level of vacuum within a set amount of time.



Action Taken When the DTC Sets



DTC P0455 is a Type B DTC.



Conditions for Clearing the MIL/DTC



DTC P0455 is a Type B DTC.



Diagnostic Aids



* Inspect for a loose, missing, damaged, or incorrect fuel fill cap.



* Inspect for a damaged fuel filler neck seal surface.



* A blockage or restriction in the evaporative emission purge solenoid valve, purge pipe, evaporative emission canister, or vapor pipe, can



cause this DTC to set.



* The evaporative emission system can be filled with smoke more quickly and completely by opening the system opposite the end where the



smoke is injected. For example, when injecting smoke at the service port remove the fuel fill cap, or temporarily leave the vent open, until



smoke is observed, then close the system and continue testing.



* To help locate intermittent leaks using the J 41413-200 - EEST , move all evaporative emission components while observing smoke with the



J 41413-SPT - White Light.

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