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Home >> Chevrolet >> 2003 >> Tracker 2D Utility, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel Systems >> Fuel Injector Balance Test >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK- ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.0L TRACKER article or DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 2.5L TRACKER article. After performing Diagnostic System Check - Engine Controls, go to next step.
  2. If fuel injector coil test has been performed, go to next step. If fuel injector coil test has not been performed, perform fuel injector coil test. See FUEL INJECTOR COIL TEST - ECT IS 50-95°F (2.0L)  or FUEL INJECTOR COIL TEST - ECT IS 50-95°F (2.5L)  . After completing fuel injector coil test, go to next step.
  3. If engine coolant temperature is more than 201°F (94°C), go to next step. If engine coolant temperature is 201°F (94°C) or less, go to step  5.
  4. Allow engine to cool to 201°F (94°C) or less and go to next step.
    5. WARNING: Wrap a shop towel around fuel pressure connection in order to reduce risk of fire and personal injury. Towel will absorb any fuel leakage that occurs during connection of fuel pressure gauge. Place towel in an approved container when connection of fuel pressure gauge is complete.
  5. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE . Install fuel pressure gauge. Turn ignition on, and then off to energize fuel pump. Place fuel pressure gauge bleed hose into a container. Bleed air from fuel pressure gauge. Turn ignition on, and then off to energize fuel pump again. Compare fuel pressure gauge reading to fuel pressure specification. See FUEL PRESSURE SPECIFICATIONS  table. If fuel pressure reading is within specification, go to next step. If fuel pressure reading is not within specification, perform fuel system diagnosis. See FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.0L & 2.5L TRACKER article.
    FUEL PRESSURE SPECIFICATIONS

    Application psi (kPa)
    2.0L 36-43 (250-300)
    2.5L 39-45 (270-310)
  6. With ignition off and fuel pump off, observe fuel pressure gauge reading. If fuel pressure reading remains constant, go to next step. If fuel pressure reading does not remain constant, perform fuel system diagnosis. See FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 2.0L & 2.5L TRACKER article.
    7. NOTE: Perform this step on each injector. Compare results to fuel pressure balance test example. See Figure.
  7. Disconnect fuel injectors harness connector. Using appropriate fuel injector adapter, connect Fuel Injector Tester (J 39021) to fuel injector. Connect fuel injector tester power leads to appropriate battery terminals. Set amperage supply selector switch on fuel injector tester to Balance Test.5-2.5-amp position. Turn ignition on, and then off to energize fuel pump. Record fuel pressure reading when fuel pressure gauge stabilizes (first reading). Energize fuel injector by depressing PUSH TO START TEST button on injector tester. Record fuel pressure reading after fuel pressure gauge needle has stopped moving (second reading). Subtract second reading from first reading (this result is pressure drop value). Note each injector drop value. Add pressure drop value for each injector together (this is total pressure drop). Divide total pressure drop by total number of injectors (this is average pressure drop). If any injector's drop value is more or less than average drop value by 1.5 psi (10 kPa), go to next step. If all injector's drop value is within 1.5 psi (10 kPa), repair by symptom. See SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - 2.0L & 2.5L TRACKER article.
    8. NOTE: DO NOT repeat any portion of this test before running engine in order to prevent engine from flooding.
  8. Retest any fuel injector that does not meet specification. Repeat step  7. If any fuel injector still has a pressure drop value that is more or less than average pressure drop by 1.5 psi (10 kPa), go to next step. If all injector's drop value is within 1.5 psi (10 kPa), repair by symptom. See SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - 2.0L & 2.5L TRACKER article.
  9. Replace any faulty fuel injectors. After repairs, go to next step.
  10. If no engine performance concerns exist, system is okay. If any engine performance concern still exists, repair by symptom. See SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - 2.0L & 2.5L TRACKER article.
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