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Old 11-14-2009, 01:12 PM
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DTC REPORT P 0440, what does that mean???

Few days ago the "check gas cap" warning came on. I checked the cap and all was fine. I took the neg off battery to clear it now the engine check light came on. I did the key cycle to get the code and DTC REPORT P 0440, what does that mean???
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Old 11-14-2009, 01:14 PM
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Re: DTC REPORT P 0440, what does that mean???

might need a new gas cap
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Old 11-14-2009, 01:20 PM
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Re: DTC REPORT P 0440, what does that mean???

Well this jeep got to spend a day at the dealer. Here's a list of what's wrong

1- drivers door squeeks
2- I hear wind noise and pass feel a draft from the pass side door
3- glove box strut fail
4- brakes squeek (might just change pads myself)
5- nav is slo
6- gas cap/engine check light
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Old 11-14-2009, 01:22 PM
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Re: DTC REPORT P 0440, what does that mean???

you have a strut on your glove box?
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Old 11-14-2009, 01:23 PM
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Re: DTC REPORT P 0440, what does that mean???

that sucks Nate! that code probably something to do with the EVAP control system. sensor? gascap? leak? I had the same thing and it was the sensor. got it replaced with the warranty.
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Old 11-14-2009, 01:24 PM
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Re: DTC REPORT P 0440, what does that mean???

spray some wd-40 on the door hinges and should be good as new
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Old 11-14-2009, 01:25 PM
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Re: DTC REPORT P 0440, what does that mean???

Kinda open the pass door and pop the side panel off to the dash and there's a plastic strut that the rubber gasket is out of place and I can't figure out how it goes.
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Old 11-14-2009, 01:27 PM
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Re: DTC REPORT P 0440, what does that mean???

yeah it definitely pretains to the Evaporative Control System.
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Old 11-14-2009, 01:28 PM
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Re: DTC REPORT P 0440, what does that mean???

It's behind the door panel that squeeks when I go to close the door or I push on it
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Old 11-14-2009, 01:30 PM
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Re: DTC REPORT P 0440, what does that mean???

Here ya go!

P0440-GENERAL EVAP SYSTEM FAILURE (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The theory behind the Natural Vacuum Leak Detection (NVLD) is adherence to the Ideal Gas Law. Pressure in a
sealed vessel will change linearly as a function of the temperature of the gas in the vessel. Even small leaks will
allow the pressure in the vessel to come to equilibrium with the atmospheric pressure. After key-off and a calibrated
amount of time, cool down from operating temperatures or diurnal ambient temperature the system pressure will
force the system to go negative or draw a vacuum if there is no leak. When the vacuum level reaches 1” H2O (0.25
KPA) the NVLD vacuum switch closes. This sends a signal to the NGC freezing a timer and registering a pass. If
a switch closure is not detected an assessment of leak size will be made.
When Monitored:
Engine Running. Fuel Level greater than 12%. Ambient Temperature between 4C and 32C (39F and 89F).
Set Condition:
The PCM does not see the NVLD switch close during the medium/large leak test. The PCM then will increase
the vacuum supply to the EVAP system by increasing flow through the EVAP Purge valve. If the switch does
not close with an increase in vacuum an error is detected. Two Trip Fault. Three good trips to turn off the MIL.
Possible Causes
EVAP PURGE SOLENOID VACUUM SUPPLY
(Z42) GROUND CIRCUIT OPEN
(K107) NVLD SWITCH SIGNAL CIRCUIT OPEN
EVAPORATIVE EMISSION LEAK DETECTION
NVLD ASSEMBLY
EVAP PURGE SOLENOID
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1. ACTIVE DTC
NOTE: If any of the following DTCs are set (P0443, P0452, P0453, P0498 or P0499) diagnose them first
before continuing with P0440.
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Yes >> Go To 2
No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 478 ENGINE ELECTRICAL DIAGNOSTICS WK
P0440-GENERAL EVAP SYSTEM FAILURE (CONTINUED)
2. VISUAL AND PHYSICAL INSPECTION
Turn the ignition off.
Perform a visual and physical inspection of the entire Evaporative Emission system.
Check for the following conditions:
- Hoses disconnected or left off
- Holes or cracks
- Loose seal points
- Evidence of damaged components
- Incorrect routing of hoses and tubes
- Fuel Cap left off or bad gasket seal
Were any of the above conditions found?
Yes >> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No >> Go To 3
3. EVAP VACUUM SUPPLY HOSE INSPECTION
Carefully inspect the Evap Purge Solenoid vacuum supply hose for proper routing.
Check for a pinched or plugged hose from the throttle body to the Purge Solenoid.
Make sure the vacuum port at the throttle body is free from any blockage.
Were any problems found?
Yes >> Repair the vacuum supply, hose/tube as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No >> Go To 4
4. CHECKING EVAP PURGE SOLENOID FUNCTIONALITY
Disconnect the vacuum supply hoses form the EVAP Purge Solenoid.
Using a hand vacuum pump, apply 10 in Hg to the 9CAN9 side of the EVAP Purge Solenoid.
Ignition on, engine not running.
Observe the vacuum gauge.
With the scan tool, actuate the EVAP Purge Solenoid.
Does the vacuum drop when the solenoid is actuated?
Yes >> Go To 5
No >> Replace the Evap Purge Solenoid.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
WK ENGINE ELECTRICAL DIAGNOSTICS 9 - 479
P0440-GENERAL EVAP SYSTEM FAILURE (CONTINUED)
5. NVLD SWITCH OPERATION
Connect the previously disconnected vacuum hose.
Start the engine.
Allow the engine to idle.
Using the scan tool, perform the NVLD FORCED MONITOR TEST.
Monitor the NVLD Switch state.
NOTE: As the test runs, the NVLD Switch should go from an OPEN state to a CLOSED state and then return
to OPEN when the test is complete.
Did the NVLD Switch operate as described above?
Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No >> Go To 6
6. VERIFY EVAPORATIVE EMISSION LEAK
To continue testing you will need Miller Tool #8404 Evaporative Emission Leak Detector (EELD).
WARNING: Keep lit cigarettes, sparks, flames, and other ignition sources away from the test area to prevent
the ignition of explosive gases. Keep the test area well ventilated.
NOTE: The fuel tank should have between 20% and 80% of fuel tank capacity to properly test the Evap
system.
Connect the red power lead of EELD to the battery positive terminal and the black ground lead to battery negative
terminal.
Block the vent hose of the EVAP Canister.
Connect shop air to the EELD.
Set the smoke/air control switch to AIR.
Insert the tester’s AIR supply tip (clear hose) into the .040 orifice on the tester’s control panel.
Press the remote smoke/air start button.
Position the red flag on the air flow meter so it is aligned with the indicator ball.
When the calibration is complete, release the remote button. The EELD flow meter is now calibrated in liters per
minute.
Install the service port adapter #8404-14 on the vehicle’s service port (if equipped) or install the #8404-ADP into the
filter line.
Connect the Air supply hose from the EELD to the service port (if equipped) or to the #8404-ADP adapter.
Press the remote button to activate AIR flow.
Compare the flow meter indicator ball reading to the red flag.
ABOVE the red flag indicates a leak present.
BELOW the red flag indicates a sealed system.
Is the indicator ball above the red flag?
Yes >> Go To 7
No >> Go To 8
9 - 480 ENGINE ELECTRICAL DIAGNOSTICS WK
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Old 11-14-2009, 01:31 PM
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Re: DTC REPORT P 0440, what does that mean???

Here's more!

P0440-GENERAL EVAP SYSTEM FAILURE (CONTINUED)
7. EVAPORATIVE EMISSION LEAK DETECTION
NOTE: A thorough visual inspection of the Evap system hoses, tubes, and connections may save time in
your diagnosis. Look for any physical damage or signs of wetness at connections. The strong smell of fuel
vapors may aid diagnosis also.
To continue testing, you will need Miller Tool #8404 Evaporative Emissions Leak Detector (EELD).
Remove the Air supply hose from the service port or the #8404-ADP adapter.
Connect the SMOKE supply tip (black hose) to the service port (if equipped) or to the #8404-ADP adapter.
Set the smoke/air control switch to SMOKE.
NOTE: The flow meter indicator ball will not move at this point.
Press the remote smoke/air start button.
NOTE: Make sure that smoke has filled the EVAP system by continuing to press the remote smoke/air start
button, remove the vehicle fuel cap, and wait for the smoke to exit. Once smoke is indicated reinstall the
fuel cap.
NOTE: For optimal performance, introduce smoke into the system for an additional 60 seconds; continue
introducing smoke at 15 second intervals, as necessary.
While still holding the remote smoke/air start button, use the white light (#8404-CLL) to follow the EVAP system
path, and look for the source of the leak indicated by exiting smoke.
If a leak is concealed from view (i.e., top of fuel tank), release the remote smoke/air start button, and use the ultraviolet
(UV) black light #8404-UVL and the yellow goggles 8404-20 to look for residual traces of dye that are left
behind by the smoke.
The exiting smoke deposits a residual fluid that is either bright green or bright yellow in color when viewed with a
UV light.
NOTE: Carefully inspect the vent side of the EVAP Canister. Due to the filtering system in the canister the
smoke or dye may or may not be visible. Introducing smoke into the filtered side of the canister may assist
in locating the leak.
Was a leak found?
Yes >> Repair or replace the leaking component as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No >> Go To 11
WK ENGINE ELECTRICAL DIAGNOSTICS 9 - 481
P0440-GENERAL EVAP SYSTEM FAILURE (CONTINUED)
8. NVLD ASSEMBLY
Turn the ignition off.
Disconnect the NVLD electrical harness connector.
Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Connect a jumper wire between the (K107) NVLD Switch Signal circuit
and the (Z42) Ground circuit in the NVLD electrical harness connector.
Monitor the NVLD Switch state on the scan tool.
Does the Switch change from OPEN to CLOSED when the
jumper wire is installed?
Yes >> Replace the NVLD Assembly.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/
POWERTRAIN CONTROL MODULE - DIAGNOSIS AND
TESTING)
No >> Go To 9
NOTE: Remove the jumper wire before continuing.
9. (Z42) GROUND CIRCUIT OPEN
Turn the ignition off.
Measure the resistance between the (Z42) Ground circuit and ground.
Is the resistance below 5.0 ohms?
Yes >> Go To 10
No >> Repair the open in the (Z42) Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE).
9 - 482 ENGINE ELECTRICAL DIAGNOSTICS WK
P0440-GENERAL EVAP SYSTEM FAILURE (CONTINUED)
10. (K107) NVLD SWITCH SIGNAL CIRCUIT OPEN
Disconnect the PCM harness connectors.
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (K107) NVLD Switch Signal circuit from
the NVLD electrical harness connector to the appropriate terminal of
the special tool #8815.
Is the resistance below 5.0 ohms?
Yes >> Go To 11
No >> Repair the open in the (K107) Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
11. PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes >> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No >> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE
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Old 11-14-2009, 01:33 PM
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Re: DTC REPORT P 0440, what does that mean???

Wow you guys are the best! And no I'm not drunk anymore...
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