With Using Schrader Valve

WARNING:

Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death. Fuel can also irritate skin and eyes. To prevent this, always complete the "BEFORE REPAIR PROCEDURE". (See BEFORE REPAIR PROCEDURE .)

Disconnect the negative battery cable.
Remove the fuel line Schrader valve cap located under the throttle body.

Fig 1: Removing Fuel Line Schrader Valve Cap
Courtesy of MAZDA MOTORS CORP.
Make sure the lever of SST is turned fully clockwise, then connect SST (Fuel pressure gauge) to the Schrader valve.
Connect the negative battery cable.
Verify that the shift lever is in N position for ATX vehicles, or neutral position for MTX vehicles.
Start the engine and idle it.

Fig 2: Connecting Fuel Pressure Gauge To Schrader Valve
Courtesy of MAZDA MOTORS CORP.
Measure the fuel line pressure.
- If not as specified, inspect the following:
  Zero or low
  - FP circuit
  - FP
  - Fuel line (clogging)
  - Fuel leakage inside pressure regulator
  High
  - Pressure regulator
Fuel line pressure

L3: 375-450 kPa {3.9-4.5 kgf/cm ² , 55-65 psi}

AJ: 430-510 kPa {4.4-5.2 kgf/cm ² , 63-73 psi}
Observe the fuel pressure gauge indicator during heavy acceleration.
Verify that the fuel pressure fluctuation is within the specification during the test.
- If not as specified, inspect the following:
  - PCM
  - FP
  - Pulsation damper
  - Fuel line for improper routing, kinks or leakage
Fuel pressure fluctuation

L3: 365-450 kPa {3.8-4.5 kgf/cm ² , 53-65 psi}

AJ: 420-510 kPa {4.3-5.2 kgf/cm ² , 61-73 psi}
Turn the ignition switch to the LOCK position.
Measure the fuel hold pressure after 5 minutes.
- If not as specified, inspect the following:
  - FP hold pressure
  - Fuel injector for leakage
  - Fuel line for improper routing, kinks or leakage
Fuel hold pressure

L3: More than 200 kPa {2.0 kgf/cm ² , 29 psi}

AJ: More than 250 kPa {2.5 kgf/cm ² , 36 psi}
Disconnect the SST and connect the fuel pipe. (See FUEL INJECTOR REMOVAL/INSTALLATION [L3] .) (See FUEL INJECTOR REMOVAL/INSTALLATION [AJ] .)
Complete the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .)