Exhaust Gas Recirculation: Testing and Inspection

Exhaust Aftertreatment Fuel Injector Diagnosis

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The Exhaust Aftertreatment Fuel Injector is located on the right rear cylinder head. Fuel is supplied to the Exhaust Aftertreatment Fuel Injector from the low pressure side of the high pressure fuel pump. An outlet tube is connected between the Exhaust Aftertreatment Fuel Injector outlet and the exhaust down pipe. When the engine control module (ECM) commands the injector ON fuel is sprayed directly into the exhaust system. The fuel ignites in the exhaust and produces the heat required for the exhaust aftertreatment regeneration.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Exhaust Aftertreatment System Description Exhaust Aftertreatment System Description

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

* J 39021 - Fuel Injector Coil and Balance Tester

* J 39021-380 - Fuel Injector Harness Adapter

Circuit/System Testing

1. Remove the Exhaust Aftertreatment Fuel Injector outlet nozzle from the exhaust, connect a piece of hose to the Exhaust Aftertreatment Fuel Injector outlet nozzle and place the other end into a suitable container.

2. Disconnect the harness connector at the Q57 Exhaust Aftertreatment Fuel Injector.

3. Connect the J 39021 - Fuel Injector Coil and Balance Tester to the Exhaust Aftertreatment Fuel Injector.

4. Set the amperage supply selector switch on the J 39021 - Fuel Injector Coil and Balance Tester to the Coil Test 2.5 amp position.

5. Engine running, verify the Exhaust Aftertreatment Fuel Injector does not leak any fuel into the container.

• If fuel is leaking from the outlet nozzle
Replace the Q57 Exhaust Aftertreatment Fuel Injector.

• If no fuel is leaking from the outlet nozzle

6. Command the J 39021 - Fuel Injector Coil and Balance Tester ON 4 times to purge the fuel lines and verify there is fuel flow.

• If no fuel flow is present

1. Engine OFF

2. Remove the Q57 Exhaust Aftertreatment Fuel Injector and connect a piece of hose to the fuel supply line and place the other end into a suitable container

3. Engine Cranking

4. Verify there is fuel flow from the Exhaust Aftertreatment Fuel Injector supply line. If no fuel is present inspect the fuel supply line for damage or blockage. If fuel flow is present, replace the Q57 Exhaust Aftertreatment Fuel Injector.

• If fuel flow is present

7. Place the rubber hose into a graduated scale container.

8. Command the J 39021 - Fuel Injector Coil and Balance Tester 1 time and verify at least 17 ml of fuel has flowed into the container.

• If less than 17 ml
Replace the Q57 Exhaust Aftertreatment Fuel Injector.

• If greater than 17 ml

9. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Indirect Fuel Injector Replacement Service and Repair for Exhaust Aftertreatment Fuel Injector replacement.

* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration Diesel Particulate Filter (DPF) Service Regeneration procedure.