5.0/5.7/6.0L/8.1L Symptoms 7 - 29
MEFI 4 - PCM
Fuel Injector Coil Test
Step Action Value Yes No
1
Was the “On-Board Diagnostic (OBD) System Check” Go to OBD
performed? — Go to Step 2 System Check
1. Turn the engine “OFF.”
2. Relieve the fuel pressure.
• Refer to the “Fuel Pressure Relief Procedure” in the
Fuel Metering section.
3. Access the Fuel Injector electrical connectors as
required.
• Refer to the “Fuel Injector” portion of the Fuel
Metering section.
4. Connect the J 39021 Fuel Injector Tester to B+ and
Ground.
2 5. Set the Amperage Supply Selector Switch on the Fuel
Injector Tester to the “Coil Test” 0.5 amp position.
6. Connect the leads from the DVOM to the Fuel Injector
Tester. Refer to the illustrations associated with the test
description.
7. Set the DVOM to the Tenths Scale (0.0).
8. Connect a scan tool.
9. Observe the Engine Coolant Temperature. 10°C-35°C
Is the Engine Coolant Temperature within the specifi ed limits? (50°F-95°F) Go to Step 4 Go to Step 3
Allow the engine to warm or cool as necessary.
3 Is the Engine Coolant Temperature within the specifi ed 10°C-35°C
limits? (50°F-95°F) Go to Step 4 —
1. Connect the Fuel Injector Tester to a fuel injector.
2. Press the “Push to Start Test” Button on the Fuel
Injector Tester.
3. Observe the voltage reading on the DVOM.
4 Notice: The voltage reading may rise during the test.
Watch for erractic voltage readings.
4. Repeat Steps 1 through 3 for each injector. Go to the Fuel
Does any of the injector voltage readings fall outside of 5.44-7.53 Injector Balance
the specifi ed value? volts Go to Step 5 Test
Replace the faulty fuel injector(s) that were not within
the specifi ed value.
5 • Refer to the “Fuel Injector” portion of the
Fuel Metrering section. 5.44-7.53
Is the action complete? volts Go to Step 6 —
1. Using a scan tool, check for any DTC(s) present
6
and clear them.
2. Attempt to start the engine.
Does the engine start and continue to run? — Go to Step 7 Go to Step 2
1. Allow the engine to idle until reaching normal
7
operating temperature.
Go to
2. Check for any DTC(s) present.
Applicable
Are any DTC(s) present? — DTC Procedure System OK
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