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Home >> Chevrolet >> 2001 >> Metro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Circuit Tests >> Fuel Injector Circuit (PRIZM) >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Turn ignition off. Disconnect all 4 fuel injector electrical connectors. Install Fuel Injector Test Light (J-34730-2B) on each fuel injector harness connector. Crank engine and observe test light for each injector. If test light flashes for each injector while cranking engine, perform fuel injector coil test. See FUEL INJECTOR COIL TEST - ENGINE COOLANT TEMPERATURE IS 50-95°F (PRIZM) . If test light does not flash for each injector, go to next step.
  3. If test light flashes for at least one injector while cranking engine, go to step  5. If test light does not flash for at least one injector, go to next step.
  4. Check for an open in fuel injector ignition feed circuit between ignition switch and fuel injector. Also, check for an open in ground circuit at ground connection. See WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  12.
  5. If test light remains illuminated on any injector while cranking engine, go to next step. If test light does not remain illuminated on any injector, go to step  8.
  6. Turn ignition off. Install Fuel Injector Test Light (J-34730-2B) on fuel injector harness connector of fuel injector circuit that test light remains illuminated. Disconnect PCM harness connector C1. Turn ignition on, engine off. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  7. Repair short to ground in faulty fuel injector control circuit between fuel injector and PCM. After repairs, go to step  12.
  8. Remove fuel injector test light from fuel injector harness connector. Connect a test light between ground and fuel injector ignition feed circuit of fuel injector harness connector that did not flash. Turn ignition on, engine off. If test light illuminates, go to step  10. If test light does not illuminate, go to next step.
  9. Repair open in fuel injector ignition feed circuit between fuel injector and junction block No. 2. After repairs, go to step  12.
  10. Check for an open in faulty fuel injector control circuit between fuel injector and PCM. Repair as necessary. Repeat steps  5- 10 until fuel injector test light flashes on all 4 injector circuits. After repairs, go to step  12. If fuel injector control circuit is okay, go to next step.
  11. Replace PCM. After repairs, go to next step.
  12. Using scan tool, clear DTCs. After repairs, operate vehicle within conditions under which original symptom was observed. If system operates properly, repair is complete. If system does not operate properly, see DIAGNOSTIC AIDS .
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