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Pinpoint Test E: Low Or High Engine Oil Pressure

  1. Possible Sources 

    • Engine oil
    • Engine oil filter housing
    • Engine oil filter
    • Engine oil pump
    • Engine oil pressure control solenoid
    • VCT unit(s)
    • Engine oil pick-up tube plugged
    • Excessive connecting rod bearing clearance
    • Excessive crankshaft main bearing clearance

    Visual Inspection and Pre-checks 

    • Verify the engine oil level is within specification.

  2. E1 CHECK THE PCM DIAGNOSTIC TROUBLE CODES (DTC)

    NOTE: This step is only necessary for symptom based diagnostics. For DTC based diagnostics, proceed to the next step.

    • Ignition ON.

    • Carry out the PCM KOEO and KOER self-tests.

    Are any Diagnostic Trouble Codes (DTCs) present? 

    Yes  Refer to the appropriate DTC Chart to diagnose the DTC present.
    No  GO to  E2

  3. E2 CHECK THE VEHICLE SERVICE HISTORY

    • Check the vehicle service history and make sure the correct oil used is documented.

    Is the correct oil used based on the vehicle service history? 

    Yes  GO to  E3
    No  CHANGE the engine oil and filter using the correct oil specification. Refer to the Specifications for the engine being diagnosed. Refer to the appropriate Engine article(s) for the procedure.

  4. E3 CHECK THE ENGINE OIL FILTER HOUSING AND SEAL

    • For the 2.7L and 3.0L Ecoboost engine, remove the oil filter housing. Inspect:

      • the oil filter housing for a plugged center stem.
      • the oil filter housing for a missing or damaged center stem.
      • for missing or damaged O-ring seal on the stem.

    • For all other engines, remove the oil filter. Inspect:

      • the oil filter for being damaged.
      • the oil filter header for a damaged center stem.
      • for missing or damaged O-ring seal.

    Are any concerns discovered? 

    Yes  REPAIR as necessary.
    No  INSTALL an new oil filter. GO to  E4

  5. E4 CARRY OUT THE ENGINE OIL PRESSURE TEST

    • Install the engine oil filter housing or engine oil filter.

    • Check the engine oil pressure. REFER to: Oil Pressure Test  . Compare the engine oil pressure gauge to the engine oil pressure specifications in the specifications procedure of the engine being diagnosed. Refer to the appropriate Engine article(s) for the procedure.

    Is the engine oil pressure within specification? 

    Yes  The system is operating normally at this time. REFER to: INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES to diagnose an instrument panel concern.
    No  For a low engine oil pressure concern, GO to  E5 For a high engine oil pressure concern, IDENTIFY the cause of the engine oil pressure restriction after the engine oil pressure sensor. REPAIR as necessary.

  6. E5 CHECK THE ENGINE OIL PICKUP TUBE

    • Remove the engine oil pan. Refer to the Removal and Installation procedure appropriate Engine article(s) for the procedure. INSPECT for a blocked engine oil pick up tube.

    • Inspect for a blocked engine oil pick up tube.

    Is the engine oil pickup tube free from obstructions and blockage? 

    Yes  GO to  E6
    No  REPAIR as necessary.

  7. E6 CHECK FOR OBVIOUS SIGNS OF EXCESSIVE WEAR

    • Visually inspect the engine oil pan for signs of a mechanical damage or excessive wear, such as metal flakes settled at the bottom of the engine oil pan, pieces of metal or other debris from the timing components.

    Is any sign of excessive wear or mechanical damage present? 

    Yes  REPAIR as necessary.
    No  INSTALL a new oil pump. REFER to the oil pump procedure in the appropriate Engine article(s) for the engine being diagnosed. CHECK the system for normal operation. If the condition is still present, GO to  E7

  8. E7 CHECK THE CONNECTING ROD BEARINGS

    • Remove the engine oil pan. Remove the connecting rod caps and check the bearings for signs of excessive wear or damage. Check the connecting rod bearing journal clearance. REFER to: Connecting Rod Bearing Journal Clearance . Compare the connecting rod bearing journal clearance to the connecting rod bearing journal clearance specification in the specifications procedure for the engine being diagnosed. Refer to the appropriate Engine article(s) for the procedure.

    Are the connecting rod bearing journal clearances within specifications? 

    Yes  GO to  E8
    No  If debris from the failed bearings or crankshaft appear to have entered the engine oil, GO to  E8. INSTALL new connecting rod bearings.

  9. E8 CHECK THE CRANKSHAFT MAIN BEARINGS

    • Remove the crankshaft main bearing caps and check the bearings for signs of excessive wear or damage. Check the crankshaft main bearing clearance. REFER to: Crankshaft Main Bearing Journal Clearance . Compare the crankshaft main bearing journal clearance to the crankshaft main bearing journal clearance specification in the specifications procedure for the engine being diagnosed. Refer to the appropriate Engine article(s) for the procedure.

    Are the crankshaft main bearing journal clearances within specifications? 

    Yes  The lower end rotating assembly (connecting rods or crankshaft) are not the source of low engine oil pressure. REFER to the appropriate Electronic Engine Controls article for the engine being diagnosed for all engine oil pressure related DTC. Refer to the appropriate Engine article(s) for the procedure.
    No  INSTALL a new long block.
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