Symptom:
P0441-EVAP PURGE FLOW MONITOR
When Monitored and Set Condition:
P0441-EVAP PURGE FLOW MONITOR
When Monitored: With engine temperature greater than 76°C (170°F), fuel control in
closed loop, engine idling for 2 minutes, no low fuel, MAP less than 15.7 inches mercury
and barometric altitude less than 8,000 feet.
Set Condition: After having passed the Leak Detection Pump (LDP) test, no vapor flow
through the evaporative system is detected by the evap monitor.
POSSIBLE CAUSES
EVAP CANISTER
WIRING HARNESS INTERMITTENT
EVAP PURGE HOSE (CANISTER TO FUEL TANK)
EVAP PURGE HOSE (SOLENOID TO CANISTER)
EVAP PURGE SOLENOID VACUUM SUPPLY
EVAP PURGE SOLENOID (LEAKY/STUCK OPEN)
EVAP PURGE SOLENOID (STUCK CLOSED)
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTC’s.
Is the DTC Specific Good Trip Counter displayed and equal to zero for P-0441?
All
Yes ® Go To 2
No ® Go To 8
2 Visually inspect the Evap canister. Look for any physical damage or any signs of fuel
that has entered the canister. Any signs of fuel may indicate a bad rollover valve.
Were any problems found?
All
Yes ® Repair or Replace as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ® Go To 3
3 Visually inspect the Evap purge hose that goes between the Evap canister and the
fuel tank. Look for any physical damage such as a pinched, plugged, ripped or dry
rotted hose.
Were any problems found?
All
Yes ® Repair or replace hose as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ® Go To 4
123
DRIVEABILITY - GAS
TEST ACTION APPLICABILITY
4 Visually inspect the Evap purge hose that goes from the Purge Solenoid to the Evap
Canister. Look for any physical damage such as a pinched, plugged, ripped or dry
rotted hose.
Were any problems found?
All
Yes ® Repair or replace hose as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ® Go To 5
5 Turn the ignition off.
Carefully inspect the Evap Purge Solenoid vacuum supply hose for proper routing.
Also check for a pinched or plugged hose from the throttle body to the Purge Solenoid.
Inspect the vacuum nipple at the throttle body for any damage or plugging.
Is the vacuum supply hose and throttle body vacuum nipple free from defects?
All
Yes ® Go To 6
No ® Repair the vacuum supply hose/tube as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6 Note: After disconnecting the Evap Purge Solenoid vacuum connections,
inspect the lines and solenoid for any signs of contamination from the EVAP
Canister. This may indicate a faulty rollover valve. Replace purge solenoid
if contamination is found
Turn the ignition off.
Disconnect the vacuum hoses at the Evap Purge Solenoid.
Using a hand vacuum pump, apply 10 inches of vacuum to the Evap Purge Solenoid
vacuum source port. (component side)
Does the Evap Purge Solenoid hold vacuum?
All
Yes ® Go To 7
No ® Replace the Evap Purge Solenoid.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7 Using a hand vacuum pump, apply 10 inches of vacuum to the Evap Purge Solenoid
vacuum source port. (component side)
Turn the ignition on.
With theDRBIIIt, actuate the 9EVAP Purge Solenoid9 and observe the vacuum gauge.
Does the vacuum drop when the solenoid is actuated?
All
Yes ® Test Complete.
No ® Replace the Evap Purge Solenoid.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
124
DRIVEABILITY - GAS
P0441-EVAP PURGE FLOW MONITOR — Continued
TEST ACTION APPLICABILITY
8 At this time, the conditions required to set a DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Perform a wiggle test of the Evap Purge Solenoid wiring while the circuit is actuated
with the DRBIIIt. Feel for the solenoid to quit actuating. Also watch for the Good
Trip Counter to change to 0.
Were any problems found?
All
Yes ® Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No ® Test Complete.
125
DRIVEABILITY - GAS
P0441-EVAP PURGE FLOW MONITOR — Continued
