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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Engine Controls - Self-Diagnostics - 3.9L & 5.9L) >> Diagnostic Tests >> DTC P0442: EVAP Leak Monitor Medium (0.040) Leak Detected, DTC P0455: EVAP Leak Monitor Large Leak Detected Or DTC P0456: EVAP Leak Monitor Small (.020) Leak Detected >> Testing

DTC P0442: EVAP Leak Monitor Medium (0.040) Leak Detected, DTC P0455: EVAP Leak Monitor Large Leak Detected Or DTC P0456: EVAP Leak Monitor Small (.020) Leak Detected: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: A loose gas cap could have caused this DTC to set. Ensure gas cap is tight, in good condition and meets original equipment manufacturer's specifications.
  1. Turn ignition on, with engine off. With the DRBIII(R) scan tool, read the DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
    2. 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 20-80 percent of fuel tank capacity to properly test the EVAP system. To test Miller EVAP Emission Leak Detector (EELD) tool (8404) is required.
  2. Disconnect the vacuum supply hose at the Leak Detection Pump (LDP). Connect and apply a continuous vacuum supply of about 20 in. Hg to the LDP. A vacuum pump such as an A/C recovery unit works well. Using the DRBIII(R) scan tool, select Engine, System Tests and actuate the LDP Test (Option 3/Hold PSI). This energizes the LDP solenoid and allows the constant vacuum source to apply vacuum to the LDP pump diaphragm. This lifts the diaphragm up and seals the atmospheric canister vent valve at the bottom of the LDP. Connect the Red power lead of the EELD to the battery positive terminal and the Black ground lead to battery negative terminal. Connect shop air to the EELD. Set the Smoke/Air control switch to Air. Insert the EELD air supply tip (Clear hose) into the appropriate calibration orifice on the EELD 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 has 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. Larger volume fuel tanks, and/or those with less fuel, may require 4-5 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? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
    3. 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.
  3. Remove the air supply hose from the service port. Connect the smoke supply tip (Black hose) to the service port. Set the Smoke/Air control switch to Smoke. The flow meter indicator ball will not move at this point. Press the remote Smoke/Air Start button. Ensure 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. 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 such as on top of fuel tank, release the remote Smoke/Air Start button, and use the Ultraviolet Black Light (8404-UVL) and the Yellow Goggles (8404-20) to look for residual traces of dye left behind by the smoke. The exiting smoke deposits a residual fluid that is either Bright Green or Bright Yellow when viewed with UVL. Was a leak found? If yes, repair or replace the leaking component as necessary. If no, go to next step.
    4. 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/repair as necessary.
  4. Turn the ignition off. Disconnect the vacuum hoses at the EVAP purge solenoid. Using a hand vacuum pump, apply 10 in. Hg of vacuum to the EVAP purge solenoid vacuum source port (component side). Monitor the vacuum gauge for at least 15 seconds. Does the EVAP purge solenoid hold vacuum? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, replace the EVAP purge solenoid.
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