Chrysler Town, Dodge Caravan. Manual — part 637
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
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.
Inspect the vacuum port at the throttle body for any damage or plugging.
Were any problems found?
All
Yes
→ Repair the vacuum supply hose/tube as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
356
DRIVEABILITY - NGC
P0441-EVAP PURGE SYSTEM PERFORMANCE —
Continued
Symptom List:
P0442-EVAP SYSTEM MEDIUM LEAK
P0455-EVAP SYSTEM LARGE LEAK
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0442-EVAP SYSTEM MEDIUM
LEAK.
When Monitored and Set Condition:
P0442-EVAP SYSTEM MEDIUM LEAK
When Monitored:
Engine Running. Cold start test. Fuel Level greater than 12%. Ambient
Temperature between 4°C and 32°C (39°F and 89°F) Close Loop fuel system. Test runs
when small leak test is maturing.
Set Condition:
The PCM activates the EVAP Purge Solenoid to pull the EVAP system into
a vacuum to close the NVLD swtich. Once the NVLD swtich is closed, the PCM turns the
EVAP Pugre solenoid off to seal the EVAP system. If the NVLD switch reopens before the
calibrated amount of time for a Medium leak an error is detected. Two Trip Fault.
P0455-EVAP SYSTEM LARGE LEAK
When Monitored:
Engine Running. Cold start test. Fuel Level greater than 12%. Ambient
Temperature between 4°C and 32°C (39°F and 89°F) Close Loop fuel system. Test runs
when small leak test is maturing.
Set Condition:
The PCM activates the EVAP Purge Solenoid to pull the EVAP system into
a vacuum to close the NVLD swtich. Once the NVLD switch is closed, the PCM turns the
EVAP Purge solenoid off to seal the EVAP system. If the NVLD switch reopens before the
calibrated amount of time for a Large leak an error is detected. Two Trip Fault.
POSSIBLE CAUSES
INTERMITTENT CONDITION
VISUAL AND PHYSICAL INSPECTION
EVAPORATIVE EMISSION LEAK DETECTION
EVAP PURGE SOLENOID OPERATION
NVLD SWITCH OPERATION
357
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
1
NOTE: Since a hot vehicle can conceal a leak, it is best to perform this test
at room temperature.
NOTE: A loose gas cap could have caused this DTC to set. Make sure gas cap
is tight and in good condition. Ensure the gas cap meets OEM specifications.
Ignition on, engine not running.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→ Go To 2
No
→ Go To 7
2
Perform a visual and physical inspection of the entire Evaporative Emission system.
Check for the follow conditions:
- Holes or cracks
- Loose seal points
- Evidence of damaged components
- Incorrect routing of hoses and tubes
- Fuel Cap gasket seal
Were any of the above conditions found?
All
Yes
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 6 - NGC.
No
→ Go To 3
358
DRIVEABILITY - NGC
P0442-EVAP SYSTEM MEDIUM LEAK —
Continued
TEST
ACTION
APPLICABILITY
3
To continue testing you will need Miller Tool #8404 Evaporative Emission Leak
Detector (EELD).
WARNING: Keep lighted 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 the EELD to the battery positive terminal and the
black ground lead to battery negative terminal.
NOTE: See Charts and Graph support material EELD Calibration Setup for
an example.
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 appropriate calibration orifice
on the tester’s control panel (based on DTC leak size).
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 is now
calibrated the flow meter in liters per minute to the size leak indicated by the DTC
set in the PCM.
Install the service port adapter #8404-14 on the vehicle’s service port.
Connect the Air supply hose from the EELD to the service port.
Press the remote button to activate AIR flow.
NOTE: Larger volume fuel tanks, lower fuel levels or if the vehicle is
equipped with a Flow Management Valve may indicate high flow and will
require 4 to 5 minutes to fill
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?
All
Yes
→ Go To 4
No
→ Go To 7
359
DRIVEABILITY - NGC
P0442-EVAP SYSTEM MEDIUM LEAK —
Continued
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст