Dodge Ram Truck 1500-2500-3500. Manual — part 1238

P0441-EVAP PURGE FLOW MONITOR (CONTINUED)

7.

EVAP PURGE SOLENOID

Using a hand vacuum pump, apply 10 inches of vacuum to the Evap Purge Solenoid vacuum source port. (com-
ponent side)

Ignition on, engine not running.

With the scan tool, actuate the EVAP Purge Solenoid and observe the vacuum gauge.

Does the vacuum drop when the solenoid is actuated?

Yes

>> Refer to the INTERMITTENT CONDTION Symptom (Diagnostic Procedure).

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Replace the Evap Purge Solenoid.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

9 - 1874

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

9 - 1875

P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED (CONTINUED)

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Immediately after a cold start, with battery/ambient temperature between 40° F and 90° F and coolant tem-
perature within 10° F of battery/ambient.

•

Set Condition:
If there is a leak larger than 0.040

9

and smaller than 0.080

9

in the evaporative system.

Possible Causes

EVAP PURGE SYSTEM LEAK

EVAP PURGE SOLENOID

LDP SWITCH

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).

Diagnostic Test

1.

ACTIVE DTC

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 condi-
tion. Make sure the gas cap meets OEM specifications.
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)

2.

VISUAL AND PHYSICAL INSPECTION

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?

Yes

>> Repair as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 3

9 - 1876

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

DR/DH

P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED (CONTINUED)

3.

VERIFY EVAPORATIVE EMISSION LEAK

To continue testing you will need Miller Tool #8404A 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 the EELD to the battery positive terminal and the black ground lead to battery neg-
ative terminal.

Block the vent hose of the canister if using the service port.

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 flow meter is now calibrated 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 and block the vent hose of the EVAP Canister
(if equipped) or install the #8404-ADP service adaptor 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.

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?

Yes

>> Go To 4

No

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

9 - 1877