P0088-FUEL RAIL PRESSURE TOO HIGH
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1 KA - DODGE NITRO - 2.8L 4 CYL TURBO DIESEL 28 - DTC-Based Diagnostics/MODULE, Engine Control (ECM)/Diagnosis and Testing P0088- RAIL TOO HIGH BATT A0 30 RELAY- AUTO SHUT DOWN MODULE- TOTALLY INTEGRATED POWER 87 87A FUSE M2 20A 3 C2 F344 BR/GY S32 F344 BR/GY S33 F344 BR/GY FUSED ASD RELAY OUTPUT GROUND BOOST MOTOR- BOOST SERVO 2 4 Z904 BK K37 20 DB/OR QUANTITY 2 VOLT SUPPLY QUANTITY G0 68 C BOOST 2 VOLT SUPPLY MODULE- ENGINE 47 C 94 C K366 K BR/LG DB/BR EXCEPT 23 C 93 EXCEPT C 2 K369 K370 SOLENOID- QUANTITY BR/OR BR S45 S46 K369 K369 K370 K370 BR/OR BR/OR BR BR 2 SOLENOID- 8b7444 For a complete wiring diagram, refer to the Wiring Information. When Monitored: With the engine running.
2 Set Condition: The ECM determines that the fuel rail pressure is too high for a given engine speed and load. Possible Causes AIR IN SYSTEM SUPPLY SYSTEM SENSOR INJECTOR(S) SOLENOID PUMP SYSTEM CONTAMINATION SYSTEM LEAK INTERMITTENT DTC Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Engine Control. CHECKING FOR OTHER ECM DTCS 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 (00BAR). Use extreme caution when inspecting for high pressure fuel leaks. Failure to follow these instructions may result in possible serious or fatal injury.. Turn the ignition on. Fuel under this amount of pressure can penetrate skin causing possible serious or fatal injury. Inspect for high pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate protective clothing when servicing fuel system. Failure to follow these instructions may result in possible serious or fatal injury. 2. With the scan tool, read the ECM DTCs. Are there any other DTCs present? Yes Refer to symptom list for problems related to the DTC other than this DTC. No Go To 2 2. CURRENT DTC Refer to the Service Information and perform the Air Bleed Procedure before continuing diagnosis.. Turn the ignition on. 2. With the scan tool, erase the ECM DTCs. 2
3 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. 3. Test drive the vehicle under various load and speed conditions to attempt to duplicate the fault. 4. With the scan tool, read the ECM DTCs. Does the scan tool display this DTC? Yes Go To 3 No Perform the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 28 - DTC-Based Diagnostics/MODULE, Engine Control 3. SYSTEM LEAK. Turn the ignition off. 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 (00BAR). Use extreme caution when inspecting for high pressure fuel leaks. Failure to follow these instructions may result in possible serious or fatal injury. Fuel under this amount of pressure can penetrate skin causing possible serious or fatal injury. Inspect for high pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate protective clothing when servicing fuel system. Failure to follow these instructions may result in possible serious or fatal injury. 2. Inspect the entire fuel system for leakage. Is there any evidence of leakage? No Go To 4 4. SYSTEM CONTAMINATION Mixing any other fuels such as gasoline or kerosine can cause this DTC to set. 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 (00BAR). Use extreme caution when inspecting for high pressure fuel leaks. Failure to follow these instructions may result in possible serious or fatal injury. Fuel under this amount of pressure can penetrate skin causing possible serious or fatal injury. Inspect for high pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate protective clothing when servicing fuel system. Failure to follow these instructions may result in possible serious or fatal injury.. Inspect the fuel system for contamination. Is the fuel contaminated? 3
4 No Go To 5 5. SENSOR CALIBRATION. Turn the ignition on. 2. With the scan tool, read the Fuel Pressure Sensor volts. Does the scan tool display between 0.45 and 0.60 volts for the Fuel Pressure Sensor? Yes Go To 6 No Check the Fuel Pressure Sensor wiring and connectors for corrosion or poor terminal contact that could cause high resistance. Repair as necessary. If wiring and connectors are o.k., replace the Fuel Pressure Sensor. 6. ATTEMPT TO START ENGINE. With the scan tool, erase the ECM DTCs. 2. Attempt to start the engine. Does the engine start and idle? Yes Go To 7 No Go To 2 7. CHECKING FOR AIR IN SYSTEM. With the scan tool in Sensors, compare the Fuel Pressure Setpoint with the Actual Fuel Pressure readings. If there is air in the fuel system, the Actual Fuel Pressure will oscillate more than 00 psi above and/or below the Fuel Pressure Setpoint. Does Actual Fuel Pressure oscillate more than 00 psi above and/or below the Fuel Pressure Setpoint? Yes Refer to the Service Information to purge air from the fuel system. No Go To 8 8. SOLENOID. With the scan tool, compare the Fuel Pressure Setpoint with the Actual Fuel Pressure. A sticking Fuel Pressure Solenoid is indicated by the Actual Fuel Pressure gradually dropping below the Fuel Pressure Setpoint then suddenly increasing (spiking) above the Fuel Pressure Setpoint. Does the Actual Fuel Pressure gradually decrease then suddenly increase (spike) above the Fuel Pressure Setpoint? 4
5 Yes Replace the Fuel Pressure Solenoid in accordance with the Service Information. No Go To 9 9. CHECKING SUPPLY SYSTEM. Perform the Checking the Fuel Supply System diagnostic procedure. (Refer to 29 - Non-DTC Diagnostics/Drivability - Diesel - Diagnosis and Testing). 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 Supply System? No Go To 0 0. INJECTOR(S) 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. 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. No Go To. SOLENOID. Turn the ignition off. 2. Replace the Fuel Pressure Solenoid in accordance with the Service Information. 3. Turn the ignition on. 4. With the scan tool, erase the ECM DTCs. 5. Attempt to start and test drive the vehicle. 6. With the scan tool, read the ECM DTCs. Does the ECM display this DTC? Yes Replace the Fuel Pump in accordance with the Service Information. 5
6 No Test Complete. 2. CHECKING SUPPLY SYSTEM. Perform the Checking the Fuel Supply System diagnostic procedure. (Refer to 29 - Non-DTC Diagnostics/Drivability - Diesel - Diagnosis and Testing). 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 Supply System? No Go To 3 3. SOLENOID. Turn the ignition off. 2. Replace the Fuel Pressure Solenoid in accordance with the Service Information. 3. Turn the ignition on. 4. With the scan tool, erase the ECM DTCs. 5. Attempt to start and test drive the vehicle. 6. With the scan tool, read the ECM DTCs. Does the ECM display this DTC? Yes Go To 4 No Test Complete. 4. QUANTITY SOLENOID. Turn the ignition off. 2. Replace the Fuel Quantity Solenoid in accordance with the Service Information. 3. Turn the ignition on. 4. With the scan tool, erase the ECM DTCs. 5. Attempt to start and test drive the vehicle. 6. With the scan tool, read the ECM DTCs. Did this DTC set again? Yes Replace the Fuel Pump in accordance with the Service Information. 6
7 No Test Complete. 7
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