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Injector Coil Test - ECT Is Not 50-95°F (3.4L)

WARNING: In order to prevent flooding of cylinder and possible engine damage, relieve fuel pressure before performing injector coil test procedure.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing powertrain diagnostic system check, go to next step.
  2. Install scan tool. Using scan tool, check engine coolant temperature. If coolant temperature is not 50-95°F (10-35°C), go to next step. If coolant temperature is 50-95°F (10-35°C), perform injector coil test. See INJECTOR COIL TEST - ECT IS 50-95°F (3.4L) .
    3. NOTE: Perform step  3 on each injector.
  3. Turn ignition off. Relieve fuel pressure. Connect Fuel Injector Tester (J-39021), Injector Switch Box (J-39021-210) and Fuel Injector Test Harness (J-39021-306) to fuel injector connector. Set amperage on fuel injector tester to Coil Test 0.5 amp position. Connect DVOM to fuel injector tester. Select fuel injector using injector switch box. Depress PUSH TO START TEST button. Record lowest voltage reading within first second of test. Record highest voltage reading other than those above 9.5 volts. Subtract any other voltage reading observed from highest voltage reading. Repeat procedure for each injector. If difference is greater than 0.6 volt, go to next step. If difference is less than 0.6 volt, perform injector balance test. See INJECTOR BALANCE TEST (2.2L & 3.4L) .
  4. Replace any injector(s) showing an initial reading greater than 9.5 volts, erratic reading or difference is greater than 0.6 volt. After repairs, perform injector balance test. See INJECTOR BALANCE TEST (2.2L & 3.4L) .
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