Vibe FWD L4-2.4L (2009)
Note: You should perform this diagnostic procedure after you perform the Fuel Injector Solenoid Coil Test.
1. Ignition ON, verify the scan tool engine coolant temperature (ECT) parameter is less than 94°C (201°F).
‹› If greater than the specified range, allow the engine to cool before proceeding.
2. Ignition OFF, install the fuel pressure gauge. Refer to Fuel Pressure Gauge Installation and Removal (See: Fuel Filter/Fuel Pressure
Release/Service and Repair/Fuel Pressure Gauge Installation and Removal).
3. Ignition ON, verify the fuel pressure is within 301-347 kPa (44-50 psi).
‹› If not within the specified range, refer to Fuel System Diagnosis (See: Computers and Control Systems/Testing and Inspection/Component
Tests and General Diagnostics/Fuel System Diagnosis) for further diagnosis of the fuel system.
4. Monitor the fuel pressure gauge for 1 minute. Verify the fuel pressure does not decrease greater than 34 kPa (5 psi).
‹› If greater than the specified range, refer to Fuel System Diagnosis (See: Computers and Control Systems/Testing and Inspection/Component
Tests and General Diagnostics/Fuel System Diagnosis) for further diagnosis of the fuel system.
Caution: Do Not repeat any portion of this test before running the engine in order to prevent the engine from flooding.
5. Connect the J 39021 to a fuel injector with the amperage supply selector switch on the fuel injector tester to the Balance Test 0.5-2.5 amp
position.
6. Command the fuel pump relay ON with a scan tool and record the fuel pressure indicated by the fuel pressure gauge after the fuel pressure
stabilizes. This is the first pressure reading.
Note:
*
Repeat this step for each fuel injector in order to obtain a pressure drop value for each fuel injector.
*
The fuel pressure may rise after the fuel injector stops pulsing. Record the fuel pressure value immediately after the fuel injector stops pulsing.
DO NOT record the higher fuel pressure value.
7. Energize the fuel injector by depressing the Push to Start Test button on the fuel injector tester. Record the fuel pressure indicated by the fuel
pressure gauge after the fuel injector has stopped pulsing. This is the second pressure reading.
8. Add all of the individual pressure drop values in order to calculate the total pressure drop. Divide the total pressure drop by the number of fuel
injectors in order to calculate the average pressure drop. The difference between any individual pressure drop and the average pressure drop
should not be greater than 10 kPa (1.5 psi).
‹› If the difference between any individual pressure drop and the average pressure drop is greater than the specified range, replace the fuel
injector.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
Fuel Injector Replacement (See: Service and Repair)