Express 2500 V8-6.6L DSL Turbo (2010)
Fuel Injector: Testing and Inspection
Indirect Fuel Injector Diagnosis
Indirect Fuel Injector Diagnosis
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Circuit/System Description
The indirect fuel injector is located on the right rear cylinder head. Fuel is supplied to the indirect fuel injector from the low pressure side of the high
pressure fuel pump. An outlet tube is connected between the indirect 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 (See: Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Exhaust Aftertreatment System Description (See: Engine, Cooling and Exhaust/Exhaust System/Description and Operation/Exhaust Aftertreatment
System Description) m Description
Electrical Information Reference
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Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
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Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Connector
Repairs/Connector Repairs)
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Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
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Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
J 39021 - Fuel Injector Coil and Balance Tester
Circuit/System Testing
1. Remove the indirect fuel injector outlet nozzle from the exhaust, connect a piece of hose to the indirect fuel injector outlet nozzle and place the
other end into a suitable container.
2. Disconnect the harness connector at the Q57 indirect fuel injector.
3. Connect the J 39021 to the indirect fuel injector.
4. Set the amperage supply selector switch on the J 39021 to the Coil Test 2.5 amp position.
5. Engine running, verify the indirect fuel injector does not leak any fuel into the container.
‹› If fuel is leaking from the outlet nozzle, replace the Q57 indirect fuel injector.
6. Command the J 39021 ON 4 times to purge the fuel lines.
7. Place the rubber hose into a graduated scale container.
8. Command the J 39021 1 time and verify greater than 14 ml of fuel has flowed into the container.