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Home >> Dodge and Ram >> 2001 >> Durango 5.9 Z, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Emission Systems & Sub-Systems >> Fuel Evaporative System >> Checking Evaporative Emission System

Checking Evaporative Emission System

NOTE: Engine MUST be in closed loop to perform this test.
  1. Start engine and allow it to reach normal operating temperature. Using scan tool, select SYSTEM TESTS, then PURGE VAPORS TEST. Monitor SHORT TERM ADAPTIVE value on scan tool and press "3" to flow. SHORT TERM ADAPTIVE value should change. If value changes, no problem is indicated at this time. Test is complete. If short term adaptive value does not change, go to next step.
  2. Using scan tool, review FREEZE FRAME DATA. Attempt to duplicate condition that caused DTC to set. Visually inspect related connectors and wiring harness for damage. Inspect for cracked, pinched or broken hoses from purge solenoid to EVAP canister and to fuel tank. Purge solenoid is located at rear of engine compartment. EVAP canister is mounted to inside of left frame rail, forward of fuel tank. Check for any related technical service bulletins that may apply. Repair hoses or wiring harness as necessary. If no problems are present, go to next step.
  3. Turn ignition on. Using scan tool, actuate EVAP PURGE SOLENOID. Wiggle EVAP purge solenoid wiring harness and listen for EVAP purge solenoid to quit actuating. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and displayed count changes to "0", or EVAP purge solenoid quits actuating, repair wiring where wiggling caused EVAP purge solenoid to quit actuating. If EVAP purge solenoid does not stop actuating and GOOD TRIP counter is not displayed or displayed count does not change to "0", go to next step.
  4. Turn ignition off. Remove EVAP purge solenoid. Inspect line from rollover valve to solenoid. Rollover valves are located on top of fuel tank. If any fuel is in rollover valve line, replace rollover valve. Rollover valves are located on top of fuel tank. Rollover valve mounted permanently to top/rear of fuel tank is not serviceable. Rollover valve located on top of fuel pump module may be serviced separately. If top/rear rollover valve is defective, fuel tank must be replaced. See FUEL TANK under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article. Replace rollover valve or fuel tank as necessary. If rollover valve is okay and no fuel is in rollover valve hose, go to next step.
  5. Remove EVAP purge solenoid. Tap EVAP purge solenoid ports against a clean, solid surface. If foreign material falls out of ports, replace EVAP purge solenoid and clean or replace vacuum and purge lines and EVAP canister as necessary. If no foreign material falls out of ports, no problem is indicated at this time. Test is complete.
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