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Home › Chevrolet › 2002 › Prizm Base, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - System & Component Testing › Fuel System › Fuel Injector Coil Test - Engine Coolant Temperature Is Not 50-95°F › Diagnostic Procedure

Diagnostic Procedure

  1. Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. After performing diagnostic system check, go to next step.
  2. Install scan tool. Using scan tool, check engine coolant temperature. Is the engine coolant temperature outside 50-95°F (10-35°C)? If yes, go to next step. If no, see FUEL INJECTOR COIL TEST - ENGINE COOLANT TEMPERATURE IS 50-95°F  .
  3. Turn ignition off. Relieve fuel pressure. Access fuel injector connectors as required. Install Fuel Injector Tester (J-39021) to battery voltage and ground. Set amperage supply selector switch on tester to COIL TEST 0.5 AMP position. Connect DVOM to fuel injector tester. Set DVOM to tenths scale (0.0). Install fuel injector tester on fuel injector. Press PUSH TO START TEST button on tester. Observe voltage reading on DVOM. Record lowest voltage reading observed after first second of test. Repeat for each fuel injector. Note highest voltage reading recorded except for reading greater than 9.5 volts. Subtract lowest voltage reading from highest voltage reading. Perform this calculation for all injectors. Is any value that resulted from the subtraction more than one volt? If yes, go to next step. If no, see FUEL INJECTOR BALANCE TEST  .
  4. Replace faulty fuel injector(s). Injector is faulty if subtracted value is greater than 0.6 volt, initial voltage reading is greater than 9.5 volts, or voltage reading is erratic. After replacing fuel injector, see FUEL INJECTOR BALANCE TEST  .
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