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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
- Evaporative Emissions (EVAP) System Flow During Non-Purge

Circuit 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 purge solenoid valve OFF and the vent solenoid valve ON. The ECM monitors the fuel tank pressure (FTP) 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 purge and vent solenoid valves.






Conditions for Running the DTC

* DTC P0068, P00C8, P00C9, P010C, P010D, P012B, P012C, P012D, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0125, P0128, P0191, P0192, P0193, P0222, P0223, P0443, P0449, P0452, P0453, P0454, P0458, P0459, P0498, P0499, P0502, P0503, P0601, P0604, P0606, P16A0, P16A1, P16A2, P160D, P160E, P16F3, P0722, P0723, P1104, P1221, P1682, P2100, P2101, P2102, P2103, P2135 is not set.

* The ignition voltage is between 11-32 V.

* The engine OFF time is greater than 8 h,

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

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

* The fuel tank level is between 10-90 %.

* The barometric pressure (BARO) is greater than 70 kPa.

* DTC P0496 runs once per cold start, for up to 17 min, when the above conditions are met.

Conditions for Setting the DTC

* The ECM detects more than 10 in H2O vacuum for 5 s during a non-purge condition.

* This test will run with the purge valve closed and the vent valve closed.

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

An intermittent condition could be caused by an improperly installed or damaged EVAP purge solenoid valve, or by a temporary blockage or restriction in the EVAP purge solenoid valve or system tubing.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views A/C Compressor Clutch

Description and Operation

Evaporative Emission Control System Description Description and Operation

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 Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, engine OFF, seal the EVAP system using the Purge/Seal function with a scan tool. This may be done by selecting Not Venting.

2. Start the engine.

3. Observe the FTP sensor with a scan tool. The FTP sensor parameter should be less than 1.7 V.

• If the FTP sensor parameter is greater than the specified range, go to Circuit/System Testing.

Note: After exiting the seal function the EVAP Purge Solenoid Valve Command may be greater than 0 %.

4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Circuit/System Testing

1. Disconnect the Q12 Evaporative Emission Purge Solenoid Valve electrical harness connector.

2. Start the engine.

3. Command the EVAP vent solenoid valve closed (Not Venting) with a scan tool.

4. Increase the engine speed to 1,200-1,500 RPM.

5. Observe the scan tool FTP sensor parameter. Verify the parameter is -0.5 to +0.5 in. H2O.

• If not within the specified range, replace the Q12 Evaporative Emission Purge Solenoid Valve.

Note: Exhaust system heat will cause the fuel vapor pressure to vary.

6. Ignition ON, engine OFF, disconnect the Q12 Evaporative Emission Purge Solenoid Valve pipe.

7. Observe the scan tool FTP sensor parameter. Verify the parameter is -0.5 to +0.5 in. H2O.

• If not within the specified range, replace the B150 Fuel Tank Pressure Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Evaporative Emission Canister Purge Solenoid Valve Replacement Service and Repair

* Fuel Tank Pressure Sensor Replacement Service and Repair

Repair Verification

1. Start the engine.

2. Command the EVAP vent solenoid valve closed (Not Venting) with a scan tool.

3. Increase the engine idle to 1,200-1,500 RPM.

4. Observe the scan tool FTP sensor parameter. Verify the parameter is -0.5 to +0.5 in. H2O.

5. Clear the DTCs with a scan tool.

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