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Test TC-113A - EVAP Purge Flow Monitor Failure

NOTE: EVAP purge solenoid may be referred to as EVAP solenoid or proportional purge solenoid.
  1. Using scan tool, clear Diagnostic Trouble Codes (DTCs) from Powertrain Control Module (PCM). Inspect all vacuum hoses for proper routing and check vacuum hoses from EVAP purge solenoid to the fuel tank for restrictions. The EVAP purge solenoid is located near passenger's side strut tower. See Fig 1. If all hoses are okay, go to next step. If any hoses are improperly routed or restricted, repair as necessary. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
    Fig 1: Locating EVAP Purge Solenoid
    G98C00002
  2. Start engine and warm engine until engine coolant temperature is greater than 170°F (76°C). Shut engine off. Disconnect vacuum hose at EVAP purge solenoid that goes to the EVAP canister.
  3. Start engine. There should be no vacuum at EVAP purge solenoid where the vacuum hose goes to the EVAP canister for 1-2 minutes. If vacuum does not exist within one minute, go to next step. If vacuum exists within one minute, perform TEST TC-113C - EVAP PURGE FLOW MONITOR FAILURE .
  4. After 90 seconds, check that vacuum exists at EVAP purge solenoid where the vacuum hose goes to the EVAP canister. If vacuum exists, go to next step. If vacuum does not exist, go to step  6.
  5. Turn ignition off. Apply no more than 5 psi (.35 kg/cm2 ) air pressure on vacuum hose that goes to the EVAP canister. DO NOT exceed 5 psi (.35 kg/cm2 ) air pressure on vacuum hose. If air will not flow through vacuum hose and EVAP canister, perform TEST TC-113B - EVAP PURGE FLOW MONITOR FAILURE . If air will flow through vacuum hose and EVAP canister, the hoses and EVAP purge solenoid are okay.
  6. Disconnect vacuum hoses at EVAP purge solenoid. Install vacuum gauge on vacuum hose that goes to throttle body. If vacuum gauge indicates manifold vacuum, go to next step. If vacuum gauge does not indicate manifold vacuum, repair or replace vacuum hose or throttle body as necessary. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
  7. Reinstall vacuum hose on EVAP purge solenoid that goes to the throttle body. Connect vacuum gauge on the port on EVAP purge solenoid that goes to the EVAP canister.
  8. If vacuum gauge indicates 3-7 in. Hg of vacuum, go to next step. If vacuum gauge does not indicate 3-7 in. Hg of vacuum, replace EVAP purge solenoid. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
  9. Using vacuum pump, apply more than 2 in. Hg of vacuum on the vacuum hose that goes to EVAP canister. If EVAP canister holds more than 2 in. Hg of vacuum, go to next step. If EVAP canister does not hold more than 2 in. Hg of vacuum, replace EVAP purge solenoid. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
  10. Check for restricted vacuum hose to EVAP canister. If vacuum hose is not restricted, go to next step. If vacuum hose is restricted, repair as necessary. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
  11. Check for restricted fuel tank vent port on top of EVAP canister. See Fig 2. This is the vent port that goes to the fuel tank. EVAP canister is located on frame rail, directly below the driver's seat. If fuel tank vent port is restricted, clean fuel tank vent port and retest system. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES . If fuel tank vent port is not restricted, replace EVAP canister. Perform TEST VER-5A - ROAD TEST FOR OBD-II TROUBLE CODES .
Fig 2: Locating EVAP Canister & Identifying Hoses
G95E35059
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