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Home >> Mazda >> 2011 >> 6 s Touring Plus >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Fuel System [MZR 2.5]) >> Fuel Line Pressure Inspector

Fuel Line Pressure Inspector

WARNING: This page is about a different variant/trim than selected.
WARNING:
  • Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can Ignite and cause serious injury or death and damage. To prevent this, complete the following inspection with the engine stopped.
  • A person charged with static electricity could cause a fire or explosion, resulting in death or serious injury. Before performing work on the fuel system, discharge static electricity by touching the vehicle body.
CAUTION:
  • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting using cloth or soft brush, and make sure that it is free of foreign material.
  1. Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION .)
  2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.5] .)
  3. Disconnect the quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION .)
  4. Turn the lever of the SST  parallel to the hose as shown in the figure.
    Fig 1: Quick Release Connector
    G06204977Courtesy of MAZDA MOTORS CORP.
    Fig 2: Turning Lever Of SST Parallel To Hose
    G07620539Courtesy of MAZDA MOTORS CORP.
  5. Insert the SST  quick release connector into the fuel pipe until a click is heard.
  6. Verify that the quick release connector is firmly connected by pulling it by hand.
  7. Start the fuel pump using the following procedure.

    Using M-MDS 

    1. Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZR 2.5] .)
    2. Connect the M-MDS to the DLC-2.
    3. Using the simulation function "FP", start the fuel pump. (See ON-BOARD DIAGNOSTIC TEST .)
    Fig 3: DLC-2 Location
    G06204979Courtesy of MAZDA MOTORS CORP.

    Without using M-MDS 

    1. Remove the fuel pump relay.
      CAUTION:
      • Short the specified terminals because shorting the wrong terminal of the main fuse block may cause malfunctions.
      Fig 4: Fuel Pump Relay
      G07620541Courtesy of MAZDA MOTORS CORP.
    2. Using a jumper wire, short fuel pump relay terminals C and D in the main fuse block.
    3. Connect the negative battery cable and operate the fuel pump.
    Fig 5: Shorting Fuel Pump Relay Terminals C And D In Main Fuse Block Using Jumper Wire
    G07620542Courtesy of MAZDA MOTORS CORP.
  8. Operate the fuel pump for 10 s  .
  9. Measure the fuel line pressure.
    • If not within the specification, inspect the following:

    If it less than the specification: 

    • Fuel pump unit
    • Fuel line for clogging or leakage

    If it exceeds the specification: 

    • Fuel line clogging

    Fuel pressure 

    375-450 kPa {3.83-4.58 kgf/cm 2  , 54.4-65.2 psi} 

  10. Stop the fuel pump using the following procedure.

    Using M-MDS 

    1. Using the simulation function "FP", stop the fuel pump.

    Without using M-MDS 

    1. Disconnect the negative battery cable to stop the fuel pump. (See BATTERY REMOVAL/INSTALLATION [MZR 2.5] .)
  11. Measure the fuel hold pressure after 5 min  .
    • If not within the specification, inspect the following:
    • Fuel line leakage

    Fuel hold pressure 

    200 kPa {2.04 kgf/cm 2  , 29.1 psi} or more 

  12. Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION .)
  13. Disconnect the SST  .
  14. Connect the quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION .)
  15. Complete the "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION .)
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