P0497
DTC P0497
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 P0497
- Evaporative Emission (EVAP) System No Flow During Purge
Circuit/System Description
This DTC tests for proper intake manifold vacuum flow to the evaporative emission (EVAP) system. The engine control module (ECM) opens the EVAP purge solenoid valve and the EVAP vent solenoid valve. The ECM then monitors the fuel tank pressure (FTP) sensor and EVAP leak detection pump pressure sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is less than a predetermined value within a predetermined time, this DTC sets.
Conditions for Running the DTC
* DTCs P0068, P0071, P0072, P0073, P0106, P0107, P0108, P0122, P0123, P0222, P0223, P0443, P0449, P0451, P0452, P0453, P0455, P0458, P0459, P0498, P0499, P0502, P0503, P0606, P0722, P0723, P16F3, P1104, P1458, P1459, P145A, P145D, P145E, P2100, P2101, P2102, P2103, P2400, P2401, P2402, P2418, P2419, P2420, P2422, P2450 is not set.
* The EVAP purge solenoid is open.
* The EVAP vent solenoid is open.
* The EVAP leak detection pump switching valve transitions from vent to not vent, pumping, to vent.
* The EVAP leak detection pump is OFF.
* The ignition voltage is greater than 11 V.
* The barometric pressure (BARO) is between 70-110 kPa (10-16 PSI).
* The outside air temperature is between 4-35°C (39-95°F).
* The engine RPM to enable is between 1500-3400.
* The engine RPM to re-enable is between 1600-3300.
* The engine vacuum to enable is between 10-37 kPa (1.5-5.4 PSI).
* The engine vacuum to re-enable is between 11-35 kPa (1.6-5.1 PSI).
* The engine airflow to enable is between 9-34 gps.
* The engine airflow to re-enable is between 10-32 gps.
* The purge flow to enable is greater than 0.14 gps.
* The purge flow to re-enable is greater than 0.13 gps.
* The purge duty cycle to enable is greater than 15 %.
* The purge duty cycle to re-enable is greater than 16 %.
* The requested purge flow to enable is greater than 1.45 %.
* The delivered purge flow to re-enable is greater than 1.40 %.
* The delivered purge flow to enable is greater than 1.10 %.
* The engine is running.
* The purge is enabled.
* The refueling request button is not pressed.
* The device control is less than 0.5 s.
* The fuel tank protection is not active.
DTC P0497 will run once per trip with propulsion system active and engine ON.
Conditions for Setting the DTC
* After an initial time delay of 3 s when the FTP sensor reading is greater than 0.39 kPa (0.056 PSI).
Or
* After an initial time delay of 3 s when the FTP sensor reading is less than 0.39 kPa (0.056 PSI), plus an EVAP leak detection pump switching valve delay time of 0.2 s.
* If the EVAP leak detection pump pressure sensor, gauge, indicates a vacuum change less than 2 kPa (0.29 PSI) for 20 s, then a low purge flow failure has been detected.
Action Taken When the DTC Sets
DTC P0497 is a Type B DTC.
Conditions for Clearing the MIL/DTC
DTC P0497 is a Type B DTC.
Diagnostic Aids
* A temporary blockage in the EVAP purge solenoid valve, purge pipe or EVAP canister could cause an intermittent condition. Inspect and repair any restriction in the EVAP system.
* A EVAP vent solenoid valve stuck closed can cause this DTC to set.
* A EVAP leak detection pump switching valve stuck in the vent or pump position can cause this DTC to set.
* A fuel tank fuel pump module assembly not fully seated in the fuel tank can cause this DTC to set.
* A loose fuel cap can cause this DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
* Evaporative Emission Control System Description Description and Operation
* Hybrid Modes of Operation Description Hybrid Modes of Operation Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* 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 Programming and Relearning for scan tool information
Special Tools
* CH-48096 - EVAP Service Access Port Tool
* GE-41413-A - Evaporative Emissions System Tester (EEST)
* GE-41413-300 - EVAP Cap And Plug Kit
* GE-41413-SPT - High Intensity White Light
For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Diagnostic Tools).
Circuit/System Verification
Warning: Refer to Fuel and Evaporative Emission Pipe Warning Fuel and Evaporative Emission Pipe Warning.
Caution: Refer to Clean, Dry, Low Pressure Gas Source Caution Clean, Dry, Low Pressure Gas Source Caution.
1. Verify the following conditions do not exist in the EVAP system:
* A loose, missing, or damaged fuel fill cap.
* A stuck closed, blocked, or restricted EVAP purge solenoid valve.
* A blockage or restriction in the EVAP purge solenoid valve vacuum supply hose, purge pipe, EVAP canister or vapor pipe.
• If you find any of the above conditions, repair as necessary.
Caution: Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution.
Note: Refer to GE-41413-A - evaporative emissions system tester operation manual for detailed instructions in Evaporative Emission Control System Diagnosis Evaporative Emission Control System Diagnosis.
2. Connect the CH-48096 - service access port tool to the EVAP purge solenoid valve. Connect the GE-41413-A - evaporative emissions system tester to CH-48096 - service access port tool.
3. Be sure the EVAP leak detection pump switching valve is in the vent position and the vent solenoid is open.
4. Use the flow meter on the GE-41413-A - evaporative emissions system tester calibrated to 0.51 mm (0.020 in) to determine there is no leak in the EVAP system.
• If a leak is detected, use the GE-41413-A - evaporative emissions system tester to apply smoke to the EVAP system until the leak is located following the Evaporative Emission Control System Diagnosis Evaporative Emission Control System Diagnosis.
5. To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the GE-41413-SPT - high intensity white light.
6. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
Circuit/System Testing
Note: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
1. Remove the GE-41413-A - evaporative emissions system tester installed during verification then install a vacuum gauge to the CH-48096 - service access port tool.
2. Engine running observe the vacuum gauge. Vacuum should not be present.
• If there is vacuum present test or replace the Q12 evaporative emission purge solenoid valve.
3. Observe the vacuum gauge while commanding the Q12 evaporative emission purge solenoid valve on with the scan tool. Vacuum should be present from 10-100 %.
• If no vacuum is present test or replace the Q12 evaporative emission purge solenoid valve.
4. Command the EVAP Test and observe the FTP sensor voltage with a scan tool. The FTP sensor parameter should be less than 0.60 V within 60 s.
• If the FTP sensor parameter is less than the specified range, repair the blocked purge path.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Evaporative Emission Canister Purge Solenoid Valve Replacement Service and Repair
* Evaporative Emission Canister Vent Solenoid Valve Replacement Service and Repair
* Evaporative Emission Canister Replacement Service and Repair
* Evaporative Emission System Vacuum Leak Detection Pump Replacement Service and Repair