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HOMESERVICE MANUALSDODGE AND RAM1999DAKOTA SLT, 2D PICKUP, 3.9 X, 4WD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESSELF-DIAGNOSTIC TESTSNTC-16A: CHECKING EVAP SYSTEM
1999 Dodge and Ram Dakota SLT, 2D Pickup, 3.9 X, 4WD, Standard

NTC-16A: Checking EVAP System

1999 Dodge and Ram Dakota SLT, 2D Pickup, 3.9 X, 4WD, StandardSECTION NTC-16A: Checking EVAP System
  1. Carefully inspect vacuum hoses for proper routing and pinched or plugged hoses from engine to EVAP purge solenoid and to fuel tank. EVAP purge solenoid is located on a bracket mounted in engine compartment. See EVAP PURGE LOCATION table. A vacuum hose routing schematic can be found on Vehicle Emission Control Information (VECI) label. VECI label is located in engine compartment, in front of radiator. Repair hoses as necessary. Perform TEST VER-6. If hoses are okay, go to next step.
    EVAP PURGE LOCATION

    Application Location
    AN Body Left Front Inner Fender
  2. Start engine and allow it to idle until engine coolant temperature is at least 170°F (76.7°C). Turn engine off. Disconnect EVAP purge solenoid-to-EVAP canister vacuum hose at EVAP purge solenoid. Start engine and allow it to idle. There should be no vacuum flow through EVAP purge solenoid for 1-2 minutes. If vacuum flow exists through EVAP purge solenoid within one minute, go to next step. If no vacuum flow exists through EVAP purge solenoid within one minute, go to  6.
  3. Turn engine off. Inspect vacuum hose and line from EVAP purge solenoid to EVAP canister for being disconnected, ripped or cut. If vacuum hose or line is disconnected, ripped or cut open, go to next step. If vacuum hose or line is not disconnected, ripped or cut open, ensure vacuum hose and line are clean and replace EVAP canister. Perform TEST VER-6.
  4. Ensure ignition is off. Inspect vacuum hose and line from EVAP purge solenoid to EVAP canister for being disconnected, ripped or cut. If vacuum hose or line is disconnected, ripped or cut open, repair vacuum line or hose as necessary and replace EVAP purge solenoid. Perform TEST VER-6. If vacuum hose or line is not ripped or cut open, go to next step.
  5. Ensure ignition is off. 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. Perform TEST VER-6. If no foreign material falls out of ports, go to next step.
    CAUTION: DO NOT apply more than 5 psi (.35 kg/cm2 ) air pressure on vacuum hose.
  6. Turn engine off. Ensure EVAP purge solenoid-to-EVAP canister vacuum hose is still disconnected at EVAP purge solenoid. Attempt to blow air through EVAP solenoid-to-EVAP canister hose. If air flows, go to next step. If air does not flow, go to  8.
  7. Start engine and allow it to idle until engine coolant temperature is at least 170°F (76.7°C). Turn engine off. Disconnect EVAP purge solenoid-to-EVAP canister vacuum hose at EVAP purge solenoid. Start engine and allow it to idle. After 90 seconds, ensure vacuum flow cycles intermittently through EVAP purge solenoid. If vacuum flow cycles intermittently through EVAP purge solenoid after 90 seconds, test is complete. If vacuum flow does not cycle intermittently through EVAP purge solenoid after 90 seconds, replace EVAP purge solenoid. Perform TEST VER-6.
    CAUTION: DO NOT apply more than 5 psi (.35 kg/cm2 ) air pressure on vacuum hose.
  8. Ensure ignition is off. Disconnect EVAP purge solenoid-to-EVAP canister vacuum hose at EVAP canister. Attempt to blow air through EVAP solenoid-to-EVAP canister hose. If air flows, go to next step. If air does not flow, go to step replace EVAP canister. Perform TEST VER-6. If air does not flow, repair or replace vacuum line. Perform TEST VER-6.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.