Torrent AWD V6-3.6L (2008)
Fuel Injector: Testing and Inspection
Fuel Injector Balance Test With Special Tool
Fuel Injector Balance Test with Special Tool
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic System Check - Vehicle
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Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The scan tool is first used to energize the fuel pump relay. The fuel injector tester is then used to pulse each injector 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.
Special Tools
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J 34730-1A Fuel Pressure Gage
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J 39021 Fuel Injector Coil and Balance Tester
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J 39021-210 Injector Selector Switch Box
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EL-39021-460 Fuel Injector Test Adapter
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J 44602 Injector Test Adapter
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).
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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.
3. Ignition ON, verify the fuel pressure is within 380-410 kPa (55-60 psi).
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If the fuel pressure is not within the specified range refer to Fuel System Diagnosis for further diagnosis of the fuel system. See: Computers
and Control Systems/Testing and Inspection/Component Tests and General Diagnostics
4. Monitor the fuel pressure gage for 1 minute. Verify that the fuel pressure does not drop more than 34 kPa (5 psi).
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If the fuel pressure decreases more than 34 kPa (5 psi) refer to Fuel System Diagnosis for further diagnosis of the fuel system. See: Computers
and Control Systems/Testing and Inspection/Component Tests and General Diagnostics