Injector Coil Test
- If powertrain OBD system check has been performed, go to next step. If powertrain OBD system check has not been performed, perform powertrain OBD system check. See POWERTRAIN OBD SYSTEM CHECK in TESTS W/CODES - 5.7L article.
- Turn ignition off. Relieve fuel pressure. Connect Fuel Injector Tester (J-39021) to battery voltage. Connect Injector Switch Box (J-39021-210). Set amperage on fuel injector tester to 0.5 amp. Connect DVOM to fuel injector tester. Connect scan tool to data link connector and monitor engine coolant temperature. If coolant temperature is 50-95°F (10-35°C), go to step 4). If coolant temperature is not as specified, go to next step.
- Allow engine to warm or cool as necessary. If engine coolant temperature is now 50-95°F (10-35°C), go to next step.
- Using fuel injector tester, press PUSH TO START TEST button and monitor DVOM reading. Perform this test to each injector. Voltage reading should be 5.44-7.53 volts. If voltage reading is as specified, go to next step. If voltage reading is not as specified, perform injector balance test. See INJECTOR BALANCE TEST.
- Replace faulty injector nozzle and poppet assembly and then proceed to next step.
- Using scan tool, clear DTCs. Start engine. If engine starts and continues to run, go to next step. If engine does not start or starts and dies, go to step 2).
- Warm engine to normal operating temperature. Using scan tool, retrieve DTCs. If DTC(s) exists, perform appropriate DTC(s) test. See TESTS W/CODES - 5.7L article. If DTC(s) do not exist, system is okay at this time.
WARNING:
In order to prevent flooding of cylinder and possible engine damage, relieve fuel pressure before performing injector coil test procedure.