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Home >> Jeep >> 2006 >> Liberty 4WD L4-2.8L DSL Turbo VIN 5 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Checking the Fuel Pressure Solenoid Circuits
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Checking the Fuel Pressure Solenoid Circuits

CHECKING THE FUEL PRESSURE SOLENOID CIRCUITS

Checking The Fuel Pressure Solenoid Circuits:






POSSIBLE CAUSES
- Fuel pressure solenoid resistance
- Open circuits

DIAGNOSTIC TEST

1. OPEN CIRCUITS




Turn the ignition off.
Disconnect the Fuel Pressure Solenoid harness connector.
Disconnect the ECM harness connectors.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Repair as necessary.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Repair as necessary.
Measure the resistance of both Fuel Pressure Solenoid circuits between the ECM harness connector and the Fuel Pressure Solenoid harness connector.

Q: Is the resistance below 10.0 ohms for both measurements?

YES: Go To 2
NO: Repair open circuit(s) as necessary.
Perform the ECM Verification Test Ver. 1. ECM Verification Test

2. FUEL PRESSURE SOLENOID RESISTANCE




Measure the resistance of the Fuel Pressure Solenoid.

Q: Is the resistance between 3.5 and 5.5 ohms?

YES: Test Complete.
NO: Replace the Fuel Pressure Solenoid.
Perform the ECM Verification Test Ver. 1. ECM Verification Test
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