TrailBlazer 4WD L6-4.2L VIN S (2002)
Fuel Injector: Testing and Inspection
Fuel Injector Circuit Diagnosis
CIRCUIT DESCRIPTION
The powertrain control module (PCM) enables the appropriate fuel injector on the intake stroke for each cylinder. A voltage is supplied directly to the
fuel injectors. The PCM controls each fuel injector by grounding the control circuit via a solid state device called a driver.
DIAGNOSTIC AIDS
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Monitoring the fuel injector circuit status with a scan tool, while moving the fuel injector harness, may help isolate an intermittent condition.
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Performing the Fuel Injector Coil Test may help isolate an intermittent condition. Refer to Fuel Injector Coil Test. See: Computers and Control
Systems/Testing and Inspection/Component Tests and General Diagnostics
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For an intermittent condition, refer to Intermittent Conditions. See: Computers and Control Systems/Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic Strategies/Intermittent Conditions
TEST DESCRIPTION
Fuel Injector Circuit Diagnosis - Steps 1-8
The numbers below refer to the step numbers on the diagnostic table.
3. This step tests for an open ignition 1 voltage supply circuit between the PCM 1 fuse and the multi-way connector.
4. This step tests for an open or high resistance between the multi-way connector and the fuel injectors.
