Chrysler PT Cruiser 2001 Service Manual Supplement page 2587

P0442-EVAP LEAK MONITOR MEDIUM (.040) LEAK DETECTED —
Continued
TEST
1 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.
Turn the ignition on.
With the DRBIII , read DTC's.
Is the DTC Specific Good Trip Counter displayed and equal to zero?
Yes → Go To 2
No
2 To continue testing you will need Miller Tools #6872A (Evap System Pressure Pump)
and #8382 (Gas Cap Tester/Adapter).
Warning: The test equipment is designed to be used to pressurize the
vehicles Evaporative System only. Using the equipment in a manner for
which it was not designed could be harmful.
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.
Attach the power source clip (red) of Miller Tool #6872A to Battery (+) and the ground
clip (black) to Battery (-).
Perform the Evaporative System Pressure Pump self test that is specified on the
tester cover.
Remove gas cap and install Miller Tool #8382 on vehicle. Install gas cap to Miller Tool
#8382. Attach the pressure supply hose from Miller Tool #6872A to the fitting on
#8382.
Disconnect the vacuum supply hose at the Leak Detection Pump. Connect and apply
a continuous vacuum supply (i.e. 20 Hg) to the Leak Detection Pump. A vacuum
pump such as an A/C recovery unit works well.
Ignition on, engine not running.
With the DRBIII in System Tests, select Leak Detect Pump Test. Read instructions
and then press Enter. Select: #3 - HOLD PSI.
On Miller Tool #6872A, set the Pressure/Hold switch to Open and set the Vent switch
to Closed. Turn the pump timer On and watch the gauge.
Note: If the pressure does not build up, there is obviously a large leak in the
system and the presence of strong fuel odor may be present. A visual
inspection should find a leak of substantial size.
When the gauge pressure reaches 14 H2O, turn the Pressure/Hold Valve to Closed.
Turn the pump timer off. Note the time and pressure. After 10 sec of stabilization
time.
Did the pressure drop more than 6 H2O in 2 minutes?
Yes → Go To 3
No
ACTION
→ Go To 4
→ Go To 4
DRIVEABILITY - GAS
127
APPLICABILITY
All
All