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Home >> Jeep >> 2005 >> Wrangler X, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 490 (Powertrain Diagnostic Procedures - Diesel) >> Diagnostic Information And Procedures >> DRIVEABILITY - Diesel - Diagnostic Tests >> P0087-Fuel Rail Pressure Malfunction Pressure Too Low; P0088-Fuel Rail Pressure Malfunction Pressure Too High; P0089-Fuel Pressure Solenoid After-Run Plausibility; P1143-Fuel Rail Pressure Malfunction Positive Pressure Deviation; P1144-Fuel Rail Pressure Malfunction Positive Volume Deviation; P1145-Fuel Rail Pressure Malfunction Negative Pressure Deviation; P1148-Fuel Rail Pressure Malfunction Pressure Drop In Overrun; P1151-Fuel Rail Pressure Malfunction Maximum Positive Deviation; P1152-Fuel Rail Pressure Malfunction Positive DEV Fuel Press Sol Set-Point; P1153-Fuel Rail Pressure Malfunction Negative DEV Fuel Press Sol Set-Point; P1154-Fuel Rail Pressure Malfunction Rail Pressure Is Too Low; P1155-Fuel Rail Pressure Malfunction Rail Pressure Is Too High; P1156-Fuel Rail Pressure Malfunction Plausibility >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURES - P0087-FUEL RAIL PRESSURE MALFUNCTION PRESSURE TOO LOW

TEST ACTION APPLICABILITY
1
WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.
WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.
Turn the ignition on.With the DRBIII®, read the ECM DTCs.Are there any other DTCs present?Yes --> Refer to appropriate test for problems related to the DTC other than this DTC.Perform ROAD TEST VERIFICATION - VER-2 .No --> Go To 2		 All
2
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRBIII® at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
NOTE: Refer to the Service Information and perform the Air Bleed Procedure before continuing diagnosis.
Turn the ignition on.With the DRBIII®, erase the ECM DTCs.
NOTE: Driving the vehicle up and down steep hills or rapid cornering with a low fuel level can cause this DTC to set. Verify with customer if Low Fuel Light was illuminated when fault occurred.
Test drive the vehicle under various load and speed conditions to attempt to duplicate the fault.With the DRBIII®, read the ECM DTCs.Does the DRBIII® display this DTC?Yes --> Go To 3No --> Go To 14		 All
3 Turn the ignition off.
WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.
WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.

Inspect the entire fuel system for leakage.
Is there any evidence of leakage?
Yes --> Repair as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 4		 All
4
NOTE: Mixing any other fuels such as gasoline or kerosine can cause this DTC to set.
Turn the ignition off.
WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.
WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.
Inspect the fuel system for contamination.Is the fuel contaminated?Yes --> Repair as necessary in accordance with the Service Information.Perform ROAD TEST VERIFICATION - VER-2 .No --> Go To 5		 All
5 Turn the ignition on.
With the DRBIII®, erase the ECM DTCs.
Attempt to start the engine.
Does the engine start and idle?
Yes --> Go To 6
No --> Go To 11		 All
6 Start the engine.
With the DRBIII® in Sensors, compare the Fuel Pressure SET-POINT with the Actual Fuel Pressure readings.
NOTE: If there is air in the fuel system, the Actual Fuel Pressure will oscillate above and below the Fuel Pressure SET-POINT.

Does Actual Fuel Pressure oscillate above and below the Fuel Pressure SET-POINT?
Yes --> Refer to the Service Information to purge air from the fuel system.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 7		 All
7 Start the engine.
With the DRBIII® in Sensors, compare the Fuel Pressure SET-POINT with the Actual Fuel Pressure readings.
NOTE: A sticking Fuel Pressure Solenoid is indicated by Actual Fuel Pressure gradually dropping below the Fuel Pressure SET-POINT then suddenly increasing (spiking) above the Fuel Pressure SET-POINT.

Does Actual Fuel Pressure gradually decrease then suddenly increase (spike) above the Fuel Pressure
Yes --> Replace the Fuel Pressure Solenoid in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 8		 All
8 Refer to the appropriate Service Information and refer to Diagnosis and Testing Fuel Delivery System table.
NOTE: The following is a list of problems that can cause fuel pressure to deviate from specification: restricted fuel filter or fuel lines, failed fuel pressure solenoid, air in fuel system, failed fuel sending unit, contaminated fuel, faulty injector.

Were there any problems with the Fuel Delivery System?
Yes --> Repair as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 9		 All
9
NOTE: An injector that sticks open can cause this DTC. A sticking injector will cause the engine to misfire and emit excessive black smoke from the exhaust system.
Start and idle the engine.Does the engine exhibit the symptoms described in the above note?Yes --> Using the Service Information, remove and inspect the Fuel Injectors for signs of damage or debris that may cause the injector to stick. Sticking injectors may cause the combustion chamber to become black and oil soaked. Replace Injector(s) as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Go To 10		 All
10 Turn the ignition off.
Replace the Fuel Pressure Solenoid in accordance with the Service Information.
Turn the ignition on.
With the DRBIII®, erase the ECM DTCs.
Attempt to start and test drive the vehicle.
With the DRBIII®, read the ECM DTCs.
Does the ECM display this DTC?
Yes --> Replace the Fuel Pump in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Test Complete.		 All
11 Refer to the appropriate Service Information and refer to Diagnosis and Testing Fuel Delivery System table.
NOTE: The following is a list of problems that can cause fuel pressure to deviate from specification: restricted fuel filter or fuel lines, failed fuel pressure solenoid, air in fuel system, failed fuel sending unit, contaminated fuel, faulty injector.

Were there any problems with the Fuel Delivery System?
Yes --> Repair as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Go To 12		 All
12 Turn the ignition off.
Replace the Fuel Pressure Solenoid in accordance with the Service Information.
Turn the ignition on.
With the DRBIII®, erase the ECM DTCs.
Attempt to start and test drive the vehicle.
With the DRBIII®, read the ECM DTCs.
Does the ECM display this DTC?
Yes --> Go To 13
No --> Test Complete.		 All
13 Turn the ignition off.
Replace the Fuel Quantity Solenoid in accordance with the Service Information.
Turn the ignition on.
With the DRBIII®, erase the ECM DTCs.
Attempt to start and test drive the vehicle.
With the DRBIII®, read the ECM DTCs.
Did this DTC set again?
Yes --> Replace the Fuel Pump in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2 .
No --> Test Complete.		 All
14
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB III® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.Refer to any Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Test Complete.		 All
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