10g. High Pressure Oil Pump Test
1Og. High Pressure Oil Pump Test
Note: Never replace the high pressure oil pump due to debris on the IPR valve screen. Remove the debris and retest the system.
Note: Higher oil temperatures are more effective for diagnosis of high pressure oil system leaks.
Note: To maintain command of the IPR valve while cranking the engine it is necessary to disconnect the crankshaft position (CKP) sensor.
Note: Make sure the battery voltage is greater than 12.5 volts at all times throughout this procedure. High pressure oil pumps will not pass the high pressure oil pump tests if the battery voltage drops below 12.5 volts during the procedure. The high pressure oil pump is dependent on cranking speed to generate sufficient injection control pressure. If the battery voltage drops below 12.5 volts the battery may need to be charged or there may be a charging system concern refer to Charging System Symptom Chart to continue diagnosis.
Purpose:
The purpose of this test is to isolate the branch tube assembly and the high pressure oil pump from the rest of the high pressure oil system and to verify pump function.
Data List
^ The scan tool may reset below 9.5 volts.
^ Select the parameters indicated from the scan tool parameter list and monitor while cranking the engine.
No or low oil in the system system leakage damaged IPR or high pressure pump could cause low pressure.
Recommended Procedure (F-Super Duty or Excursion - Build Date On Or Before 9-29-03):
^ Remove the left and right hand valve covers. Refer to Engine, Valve Cover.
^ Disconnect the high-pressure oil rail supply lines at the high-pressure oil rails using the Disconnect Tool, Quick-Release Coupling 303-755 or equivalent. Install the plugs from the Adapter, Oil Pressure Leak Test 303-756 or equivalent into the high-pressure oil rail supply lines to block them off.
^ Remove the FICM relay.
^ Disconnect the crankshaft position (CKP) sensor.
^ Connect the scan tool.
^ Access and monitor the ICP ICP_V IPR, and B+ PIDS.
^ Using the scan tool, command the IPR duty cycle above 60%.
^ Crank the engine until the ICP PIDs are stable and not changing.
^ Compare to the specification.
If the minimum ICP specification is achieved a leak in the high pressure oil system is suspect. Remove both oil rail plugs and head tubes (stand pipe front plugs and both stand pipes) from the oil rails as equipped and inspect the seals as a possible leak source. Replace the damaged components as necessary. Refer to Engine. Carry out the High Pressure Oil System Air Pressure Test in this section to verify the repair.
If the minimum ICP specification is not achieved a leaking rear engine tube assembly or a damaged high pressure oil pump is suspect. Remove the pump cover and inspect for leaks. Repair any leaks and repeat the test or replace the pump if no leaks are present. Refer to Fuel Charging and Controls Oil Pump.
Recommended Procedure (E-Series or F-Super Duty or Excursion - Build Date On 9-30-03 Or Later):
^ Remove the left and right hand valve covers. Refer to Engine, Valve Cover.
^ Remove both upper crankcase to head tubes (stand pipes).
^ Remove the ICP sensor.
^ Install the ICP sensor into the Adapter, ICP Test 303-1163/1 and into the rear of the right high pressure oil rail where the upper stand pipe was removed.
^ Install the Adapter, ICP Test 303-1163/2 into the rear of the left high pressure oil rail where the upper stand pipe was removed.
^ Install the Adapter Cable, ICP/EBC 41 8-D003 (D94T-50-A) or equivalent to the existing ICP sensor connector.
^ Remove the FICM relay.
^ Disconnect the crankshaft position (CKP) sensor.
^ Connect the scan tool.
^ Access and monitor the ICP ICP_V IPR, and B+ PIDs.
^ Using the scan tool, command the IPR duty cycle above 60%.
^ Crank the engine until the ICP PIDs are stable and not changing. Compare to the specification.
Possible Causes:
^ Rear engine tube assembly
^ High pressure oil pump Tools Required:
^ Adapter Oil Pressure Leak Test 303-756 or equivalent
^ Disconnect Tool Quick-Release Coupling 303-755 or equivalent
^ Scan tool