SRX AWD V6-3.6L (2008)
Fuel Injector: Testing and Inspection
Fuel Injector Balance Test with Tech 2
Fuel Injector Balance Test with Tech 2
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.
Diagnostic Fault Information
Circuit/System Description
The scan tool first energizes the fuel pump and then the injectors for a precise amount of time allowing a measured amount of fuel into the manifold.
This causes a drop in system fuel pressure that can be recorded and used to compare each injector.
Diagnostic Aids
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Monitoring the misfire current counters, or misfire graph, may help to isolate the fuel injector that is causing the condition.
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Operating the vehicle over a wide temperature range may help isolate the fuel injector that is causing the condition.
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Perform the fuel injector balance test within the conditions of the customers concern. A fuel injector condition may only be apparent at a certain
temperature, or under certain conditions.
Reference Information
Schematic and Connector End View Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Special Tools Required
CH-48027 Fuel Pressure Gage
Component Testing
Fuel Injector Balance Test with Special Tool
1. Ignition ON, with a scan tool verify that the engine coolant temperature (ECT) is less than 94°C (201°F).
‹› If the ECT is greater than 94°C (201°F) allow the engine to cool before proceeding.
2. Ignition OFF, install the fuel pressure gage. Refer to Fuel Pressure Gage Installation and Removal (See: Fuel Pressure/Testing and
Inspection/Fuel Pressure Gage Installation and Removal) .
3. Ignition ON, verify the fuel pressure is within 380-410 kPa (55-60 psi).
‹› If the fuel pressure is not within the specified range refer to Fuel System Diagnosis (See: Computers and Control Systems/Testing and
Inspection/Component Tests and General Diagnostics) for further diagnosis of the fuel system.