i-290 2WD L4-2.9L (2008)
‹› If the fuel pump does not operate, refer to Fuel Pump Electrical Circuit Diagnosis (See: Computers and Control Systems/Testing and
Inspection/Component Tests and General Diagnostics/Fuel Pump Electrical Circuit Diagnosis) .
2. Ignition OFF, all accessories OFF, install a CH-48027. Refer to Fuel Pressure Gage Installation and Removal (See: Fuel Pressure Gage
Installation and Removal) .
3. Ignition ON, engine OFF, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 345-427 kPa (50-62 psi) and
does not decrease more than 34 kPa (5 psi) in 1 minute.
Circuit/System Testing
Important:
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The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
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DO NOT start the engine.
1. Ignition ON, engine OFF, command the fuel pump relay ON with a scan tool and observe the fuel pressure gage while the fuel pump is operating.
Verify the fuel pressure is between 345-427 kPa (50-62 psi).
‹› If the fuel pressure is greater than the specified range, replace the fuel tank module.
‹› If the fuel pressure is less than the specified range, test, inspect, and repair the items listed below. If all items test normal, replace the fuel tank
module.
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Restricted fuel feed pipe
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Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
2. Verify that the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 minute.
‹› If the fuel pressure decreases more than the specified value, perform the following procedure:
1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief (With CH 48027) (See: Fuel Filter/Fuel Pressure Release/Service and
Repair/Fuel Pressure Relief (With CH 48027))Fuel Pressure Relief (Without CH 48027) (See: Fuel Filter/Fuel Pressure Release/Service and
Repair/Fuel Pressure Relief (Without CH 48027)) .
2. Install the J 37287 between the fuel feed pipe and the fuel rail.
3. Open the valve on the J 37287.
4. Ignition ON, command the fuel pump relay ON with a scan tool and bleed the air from the CH-48027.
5. Command the fuel pump relay ON and then OFF with a scan tool.
6. Close the valve on the J 37287.
7. Monitor the fuel pressure for 1 minute.
‹› If the fuel pressure decreases more than 34 kPa (5 psi) within the specified time, locate and replace the leaking fuel injector(s).
‹› If the fuel pressure does not decrease more than 34 kPa (5 psi) within the specified time, replace the fuel tank module.
3. Relieve the fuel pressure to 69 kPa (10 psi). Verify that the fuel pressure does not decrease more than 14 kPa (2 psi) in 5 minutes.
‹› If the fuel pressure decreases more than the specified value, replace the fuel tank module.
4. Operate the vehicle within the conditions of the customer's concern while monitoring the fuel pressure with the CH-48027. The fuel pressure
should not drop off during acceleration, cruise or hard cornering.
‹› If the fuel pressure drops off, test, inspect, and repair the items listed below. If all items test normal, replace the fuel tank module.
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Restricted fuel feed pipe
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Inspect the harness connectors and the ground circuits of the fuel pump for poor connections
5. If the fuel system tests normal, refer to Symptoms - Engine Controls (See: Computers and Control Systems/Testing and Inspection/Symptom
Related Diagnostic Procedures/Symptoms - Engine Controls) .
Repair Instructions
Perform the Diagnostic Repair Verification (See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures/Diagnostic Repair Verification) after completing the diagnostic procedure.
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Fuel Hose/Pipes Replacement - Chassis (See: Fuel Return Line/Service and Repair)
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Fuel Injector Replacement (See: Fuel Injector/Service and Repair)
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Fuel Tank Module Replacement (See: Fuel Tank Unit/Service and Repair)