• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
This DTC tests for continuous intake manifold vacuum flow to the Evaporative Emission (EVAP) System. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve Closed and the EVAP canister vent solenoid valve Closed. The control module 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.
FTP Sensor Signal Voltage | Fuel Tank Pressure |
---|---|
High, Approximately 1.5 Volts or More | Negative Pressure/Vacuum |
Low, Approximately 1.5 Volts or Less | Positive Pressure |
• | Before the engine control module (ECM) can report DTC P0496 failed, DTCs P0451, P0452, and P0453 must run and pass. |
• | DTCs P0100, P0101, P0102, P0103, P0111, P0112, P0113, P116, P0117, P0118, P0119, P0125, P0443, P0446, P0449, P0451, P0452, P0453, P0458, P0459, P0496, P0498, P0499, P0560, P0562, P0563, P0721, P0722, P2122, P2123, P2127, P2128, P2138, P2227, P2228, and P2229 are not set. |
• | The fuel system is in closed loop. |
• | The engine run time is more than 16 minutes or the long term fuel trim is stable. |
• | The vehicle speed sensor (VSS) is less than 3 km/h (2 mph). |
• | The engine is idling. |
• | The ignition voltage is between 10-18 volts. |
• | The FTP is between -18.7 to +7.5 mm Hg (-10.0 to +4.0 in H2O). |
• | The ambient air temperature is between 2-32°C (36-90°F). |
• | The start-up engine coolant temperature (ECT) is within 10°C (18°F) of ambient air temperature |
• | The fuel tank level is between 12-88 percent. |
• | The volumetric efficiency is less than 35 percent. |
• | The barometric pressure (BARO) is more than 68 kPa. |
• | The above conditions are met for more than 4 seconds. |
• | DTC P0496 will attempt to run up to 10 times or the test completes successfully once per ignition cycle. |
• | The control module detects vacuum during a non-purge condition. |
• | The condition exists for more than 4 seconds or for a cumulative of 50 seconds. |
DTC P0496 is a Type A/B DTC.
DTC P0496 is a Type A/B DTC.
• | Observe the Freeze Frame/Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition occurs that caused the DTC to set . This may assist in diagnosing the condition. |
• | 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 , or by a temporary blockage or restriction in the EVAP canister purge solenoid valve. |
Evaporative Emission Control System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
⇒ | If the FTP sensor in H2O parameter is greater than the specified range, replace the EVAP purge solenoid valve. |
⇒ | If the FTP sensor parameter is greater than the specified range, replace the FTP sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for engine control module replacement, setup, and programming |