10g. High Pressure Oil Pump Test

10g. 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.
- Higher oil temperatures are more effective for diagnosis of high pressure oil system leaks.
- To maintain command of the IPR valve while cranking the engine, it is necessary to disconnect the crankshaft position (CKP) sensor.
- 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 the Charging System, Symptom Chart to continue diagnosis.

Purpose:
The purpose of this test is to isolate the high pressure oil branch tube 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:
- Remove the left and right hand valve covers.
- 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 418-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_DES, 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. Carry out the High Pressure Oil System Air Pressure Test to verify the repair. 10f. High Pressure Oil System Air Pressure Check

If the minimum ICP specification is not achieved, a leaking high pressure oil branch tube or 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.

Possible Causes:
- High pressure oil branch tube
- High pressure oil pump

Tools Required:
- Scan tool
- Adapter, ICP Test 303-1163 or equivalent
- Adapter Cable, ICP/EBC 418-0003 (094T-50-A) or equivalent