P0496
DTC P0496
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0496
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Evaporative Emission (EVAP) System Flow During Non-Purge
Circuit/System Description
This DTC tests for undesired intake manifold vacuum flow to the evaporative emission (EVAP) system. The engine control module (ECM) seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. The ECM monitors the fuel tank pressure sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a predetermined value within a predetermined time, this DTC sets. The following table illustrates the relationship between the ON and OFF states, and the open or closed states of the EVAP canister purge solenoid and EVAP canister vent solenoid valves.
Conditions for Running the DTC
* DTCs P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0119, P0122, P0123, P0128, P0222, P0223, P0443, P0449, P0452, P0453, P0454, P0606, P2101, and P16F3 are not set.
* The ECM is not commanding reduced engine power.
* The ignition voltage is between 11-32 V.
* The barometric pressure (BARO) is more than 70 kPa (10.15 PSI).
* The fuel level is between 10-90%.
* The start up engine coolant temperature (ECT) is less than 36°C (96.8°F).
* The start up intake air temperature (IAT) is between 4-30°C (39-86°F).
* The ignition is OFF for greater than 12 h.
* The EVAP canister purge and EVAP vent valves are closed.
* The DTC run once an ignition cycle when the above conditions are met.
Conditions for Setting the DTC
The fuel tank pressure sensor indicates vacuum during a non-purge condition.
Action Taken When the DTC Sets
DTC P0496 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0496 is a Type B DTC.
Diagnostic Aids
The EVAP system tests run when engine is first started and meets the Conditions for Running the DTC. An intermittent condition could be caused by an improperly installed or damaged EVAP canister purge solenoid valve.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Electrical Information Reference
* Circuit Testing Circuit Testing
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Troubleshooting with a Test Lamp Troubleshooting with a Test Lamp
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
EN 41413-300 - EVAP Cap And Plug Kit
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Testing
1. Disconnect the EVAP vent pipe from the Q13 Evaporative Emission Vent Solenoid Valve.
2. Seal the EVAP vent pipe using a plug from the EN 41413-300 - EVAP Cap and Plug Kit.
3. Observe the scan tool Fuel Tank Pressure Sensor parameter. The Fuel Tank Pressure Sensor parameter should be less than 1.7 V.
• If the scan tool Fuel Tank Pressure Sensor parameter is greater than the specified range, replace the Q12 Evaporative Emission Purge Solenoid Valve.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Evaporative Emission Canister Replacement Service and Repair