LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2003 >> Tracker 2D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel Systems >> Fuel Injector Circuit Diagnosis >> Diagnostic Procedures
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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. NOTE: Ensure Malfunction Indicator Light (MIL) operation and Data Link Connector (DLC) communication is okay before continuing.
  2. Turn ignition off. Disconnect all fuel injector harness connectors. Install Fuel Injector Test Light (J-34730-2B) to each fuel injector harness connector one at a time. Observe injector test light for each injector while cranking engine. If injector test light flashes for each injector while cranking engine, 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)  . If injector test light does not flash for each injector while cranking engine, go to next step.
  3. If injector test light remained illuminated for any injector while cranking engine, go to next step. If injector test light does not remain illuminated for any injector while cranking engine, go to step  5.
  4. Check for short to ground in faulty fuel injector control circuit between fuel injector and PCM. See WIRING DIAGRAMS . Repair as necessary and go to step  11. If control circuits are okay, go to step  10.
  5. Remove fuel injector test light from fuel injector harness connector. Connect a test light between ground and ignition feed circuit of fuel injector harness that did not flash. See WIRING DIAGRAMS . Turn ignition on, engine off. If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  6. Connect a test light between battery voltage and fuel injector control circuit of fuel injector harness that did not flash. See WIRING DIAGRAMS . Observe test light while cranking engine. If test light flashes while cranking engine, go to next step. If test light does not flash while cranking engine, go to step  9.
  7. Repair poor connections at fuel injector harness connector. After repairs, go to step  11.
  8. Repair open in ignition feed circuit between fuel injector and main relay. After repairs, go to step  11.
  9. Check for open in faulty fuel injector control circuit. Repair as necessary and repeat test procedure beginning at step  2 until test light flashes for all injectors. After repairs, go to step  11. If a circuit malfunction does not exist and test light does not flash at all injectors, go to next step.
  10. Replace PCM. See REMOVAL & INSTALLATION - TRACKER article. After repairs, go to next step.
  11. Operate vehicle within conditions under which original symptom was observed. If system operates properly, system is okay. If system does not operate properly, go to DIAGNOSTIC AIDS .
scientia non olet · About LEMON Manuals