EVAP System Leak Inspection Using Leak Tester

Perform the following SST (EVAP System Tester 134-01049A) self-test:
NOTE:
- If the tester does not work correctly during the self-test, refer to the tester operators manual for a more detailed self-test procedure.
1. Verify that the control valve on the panel is in the HOLD position then open the nitrogen bottle valve.
2. Connect the vehicle interface hose (part of the SST ) to the SELF-TEST port located on the control panel. Hand tighten the fitting. (Do not overtighten).
3. Turn the control valve to the TEST position.
4. The gauge should read 331-381 mm {13-15 in} of water.
  - If the gauge is not reading in this range, adjust the pressure by turning the black knob on the low pressure regulator at the nitrogen bottle.
5. Turn the control valve to the HOLD position.
6. Verify that the gauge holds pressure and that the flow meter reads no flow.
  - If there is no drop in pressure and no flow, the tester passes the self-test.
  - If the gauge leaks down, refer to the tester operators manual.
    
    Fig 1: Inspecting EVAP System Leak Using Leak Tester
    Courtesy of MAZDA MOTORS CORP.
Connect the SST to the vehicle.
1. Verify that the control valve on the panel is in the HOLD position then open the nitrogen bottle valve.
2. Remove the fuel-filler cap from the vehicle.
  - If the fuel-filler cap is not a MAZDA part or equivalent, replace it.
3. Connect the receiver assembly (SST: AKS441130) to the vehicle cap test hose assembly (part of the SST) and the fuel-filler cap from the vehicle.
4. Connect the cap adaptor (SST: AKS441131) to the vehicle cap test hose assembly (part of the SST ) and to the fuel-filler neck.
5. Connect the vehicle interface hose (part of the SST ) to the center fitting of the vehicle cap test hose assembly (part of the SST ).
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position (Engine off).
Request the PCM on-board device control (Mode 08) using the M-MDS to close the change-over valve (COV) in the EVAP system leak detection pump.

Fig 2: Identifying Cap Adatper, Receiver Assembly And Vehicle Cap Test Hose Assembly
Courtesy of MAZDA MOTORS CORP.
NOTE:
- The COV is closed for 10 min unless the following any actions are done:
  - The engine is started.
  - The ignition switch is turned off position.
Make sure the control valve on the 134-01049A is in the HOLD position and that the valve on the cylinder of nitrogen gas is open.
Turn the control valve to the open position and let the system fill. You should note a drop in the gauge pressure along with the flow meter being pegged at maximum flow for several minutes depending on how full or empty the fuel tank is, and how long it takes to completely fill and pressurize the evaporative emissions system hoses.
If the gauge and the flow meter do not settle to a measurable level after 2-3 min, then refer to the appropriate Service Information to verify that the PURGE SOLENOID VALVE is properly closed.
Verify the pressure gauge and flow meter reading to determine if there is an evaporative emissions leak:
NO EVAPORATIVE LEAK:
- The flow meter registers "zero flow" and the pressure gauge returns to the pre-set pressure of 356 mm {14 in} of water (H2O).
EVAPORATIVE LEAK:
- The pressure does not return to the preset level of 356 mm {14 in} of water (H2O) when measuring the flow. See "SETTING LEAK STANDARD FOR TESTING" (.020 to.040 inch H2O) of the Evaporative Emissions Tester operators manual (134-01067).
NOTE:
- Turn the control valve to the HOLD position then disconnect the SST.