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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 760 (FUEL SYSTEM)FUEL INJECTOR INSPECTIONINJECTION VOLUME INSPECTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Injection Volume Inspection

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Injection Volume Inspection
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
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.
  1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION .)
  2. Disconnect the negative battery cable.
  3. Remove the PCM (See PCM REMOVAL/INSTALLATION .).
  4. Connect the PCM connector.
  5. Remove the fuel injector and fuel distributor as a single unit. (See FUEL INJECTOR REMOVAL/INSTALLATION .)
  6. Fix the fuel injector to the fuel distributor with a wire or the equivalent.
  7. Connect the corresponding fuel injector connector.
  8. Connect the negative battery cable.
  9. Ground the following PCM terminals using a jumper wire.
    • With immobilizer system: 1AR
    • Without immobilizer system: 1AQ
      Fig 1: Inspecting Fuel Injector Injection Volume
      G00973887Courtesy of MAZDA MOTORS CORP.
  10. Turn the ignition switch to the ON position to start the fuel pump.
    Fig 2: Identifying PCM Wiring Harness Side Connector Terminals 1AQ, 1AR
    G00973888Courtesy of MAZDA MOTORS CORP.
  11. Ground the following PCM terminals using a jumper wire and measure the injection volume of each fuel injector.
    • If not within the specification, replace the fuel injector.
      Fig 3: Identifying PCM Wiring Harness Side Connector Terminals 2BB, 2BC, 2BD, 2AZ
      G00973889Courtesy of MAZDA MOTORS CORP.
    1. Standard 
    2. For California emission regulation applicable model: 260--320 ml {260--320 cc, 15.9--19.5 cu in}/min 
    3. Except for California emission regulation applicable model, LF-DE: 195--245 ml {195--245 cc, 11.9--14.9 cu in}/min 
    4. Except for California emission regulation applicable model, L3-VE: 230--290 ml {230--290 cc, 14.1--17.6 cu in}/min 
      Fig 4: Fuel Injector & Corresponding PCM Terminal Table
      G00973890Courtesy of MAZDA MOTORS CORP.
  12. Turn the ignition switch to the LOCK position to stop the fuel pump and disconnect the jumper wire.
  13. Remove the wire or equivalent securing the fuel injector.
  14. Install the fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION .)
  15. Inspect all related parts by performing "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION .)
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.