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DTC Code PO496 2005 Colorado, I Hear a vacume leak on Back of Valve Cover Area

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Check for a loose hose on the purge valve
DTC Code PO496 2005 Colorado, - jturcotte_1727.gif

Posted on May 18, 2011

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Code is for evap system. leak you hear is vacuum line off or broken

Posted on May 18, 2011

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Its alot but will help

Hope this helps
DTC P0496
System Description
This DTC tests for undesired 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.

The following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent solenoid valves.

Control Module Command
EVAP Canister Purge Solenoid Valve
EVAP Canister Vent Solenoid Valve

ON
Open
Closed

OFF
Closed
Open


Conditions for Running the DTC
DTCs P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0151, P0152, P0153, P0154, P0155, P0156, P0157, P0158, P0160, P0161, P0220, P0442, P0443, P0449, P0452, P0453, P0455, P0502, P0503, P1111, P1112, P1114, P1115, P1121, P1122, P1125, P2135 are not set.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 75 kPa.
The fuel level is between 15-85 percent.
The engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The intake air temperature (IAT) is between 4-30°C (39-86°F).
The start up ECT and IAT are within 9°C (16°F) of each other.
Conditions for Setting the DTC
A continuous open purge flow condition is detected during the diagnostic test.
The fuel tank pressure decreases to less than -11 inches H2O.
Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
• The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

• Clear the MIL and the DTC with a scan tool.

Step
Action
Values
Yes
No

Schematic Reference: Emission Hose Routing Diagram

1
Did you perform the Diagnostic System Check - Engine Controls?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls

2
Start the engine.
Seal the evaporative emission (EVAP) system using the Purge/Seal function with a scan tool.
Increase the engine idle to 1,200-1,500 RPM.
Observe the fuel tank pressure sensor in H2O with a scan tool.
Is the fuel tank pressure sensor parameter within the specified value?
-1 to +1 in H2O
Go to Intermittent Conditions
Go to Step 3

3
Turn OFF the ignition.
Disconnect the EVAP purge pipe from the EVAP purge solenoid valve.
Turn ON the ignition, with the engine OFF.
Observe the fuel tank pressure sensor in H2O with a scan tool.
Is the fuel tank pressure sensor parameter within the specified range?
-1 to +1 in H2O
Go to Step 4
Go to Step 5

4
Replace the EVAP purge solenoid valve. Refer to Evaporative Emission (EVAP) Canister Purge Solenoid Valve Replacement .

Did you complete the replacement?
--
Go to Step 6
--

5
Replace the fuel tank pressure (FTP) sensor. Refer to Fuel Tank Pressure Sensor Replacement .

Did you complete the replacement?
--
Go to Step 6
--

6
Connect all EVAP hardware that was previously disconnected.
Seal the EVAP system using the Purge/Seal function with a scan tool.
Start the engine and idle at 1,200-1,500 RPM.
Observe the fuel tank pressure sensor parameter with a scan tool.
Is the fuel tank pressure sensor parameter within the specified range?
-1 to +1 in H2O
Go to Step 7
Go to Step 2

7
Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?
--
Go to Diagnostic Trouble Code (DTC) List
System OK

Posted on May 18, 2011

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