Injector Coil Test (Except 2.2L & 3.4L)

WARNING: In order to prevent flooding of cylinder and possible engine damage, relieve fuel pressure before performing injector coil test procedure.

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.
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. Install scan tool 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.

NOTE: Perform step 4 on each injector.

Using fuel injector tester, press PUSH TO START TEST button and monitor DVOM reading. Repeat procedure for 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 (EXCEPT 2.2L & 3.4L) .
Replace faulty injector nozzle and poppet assembly. After repairs, go 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 no DTC(s) are set, system is okay. If any DTC(s) are set, perform appropriate DTC(s) test. See appropriate SELF-DIAGNOSTICS article.