C1.5 and C2.2 Engines for Caterpillar Built Machines Caterpillar

The Electronic Control Module (ECM) monitors the engine oil pressure. The following event is associated with low engine oil pressure:

As engine oil pressure is monitored by a switch, the electronic service tool will show either 0 kPa (0 psi) or 300 kPa (43.5 psi). This indication shows that the switch is either open or closed and not actual engine oil pressure.

Probable Causes

• Engine oil level

• Oil specification

• Engine oil pressure

• Engine oil filter

• Engine oil cooler

• Fuel in the engine oil

• Engine oil suction tube

• Engine oil pump

• Bearing clearance

Recommended Actions

Engine Oil Level

1. Inspect the engine oil level. If necessary, add oil.

2. If the fault is still apparent, proceed to "Oil Specification".

Oil Specification

1. Make sure that engine oil of the correct specification is used. Refer to the Operation and Maintenance Manual, "Refill Capacities and Recommendations".

2. If necessary, drain the oil system and refill the oil system with engine oil of the correct specification. Refer to Operation and Maintenance Manual, "Engine Oil and Filter - Change".

3. If the fault is still apparent, proceed to "Engine Oil Pressure".

Engine Oil Pressure

1. Check the actual engine oil pressure with a calibrated test gauge. If normal oil pressure is seen, investigate the oil pressure switch and the associated wiring.

2. If low oil pressure is indicated, proceed to "Engine Oil Filter".

Engine Oil Filter

1. Remove the engine oil filter. Refer to the Operation and Maintenance Manual, "Engine Oil and Filter - Change".

2. Inspect the engine oil filter for evidence of blockage.

3. Install a new engine oil filter. Refer to the Operation and Maintenance Manual, "Engine Oil and Filter - Change".

4. If the fault is still apparent, proceed to "Engine Oil Cooler".

Engine Oil Cooler

1. If oil flow or coolant flow through the oil cooler is suspected of being low, replace the oil cooler. Refer to Disassembly and Assembly, "Engine Oil Cooler - Remove" and Disassembly and Assembly, "Engine Oil Cooler - Install".

2. If the fault is still apparent, proceed to "Fuel in the Engine Oil".

Fuel in the Engine Oil

1. If contamination of the engine oil with fuel is suspected, refer to Troubleshooting, "Oil Contains Fuel".

2. If the fault is still apparent, proceed to "Engine Oil Suction Tube".

Engine Oil Suction Tube

1. Check the inlet screen on the oil suction tube and remove any material that may be restricting oil flow.

2. Check the joints of the oil suction tube for cracks or a damaged joint. Cracks or damage may allow air leakage into the supply to the oil pump.

3. If no faults are found, proceed to "Engine Oil Pump".

Engine Oil Pump

1. Inspect the components of the engine oil pump for excessive wear. Repair the oil pump or replace the oil pump, if necessary. Refer to Disassembly and Assembly, "Engine Oil Pump - Remove", Disassembly and Assembly, "Engine Oil Pump - Install" and Disassembly and Assembly, "Engine Oil Relief Valve - Remove and Install".

2. If no faults are found, proceed to "Bearing Clearance".

Bearing Clearance

Inspect the engine components for excessive bearing clearance or damaged bearings. If necessary, replace the bearings and/or the components. Inspect the following components for excessive bearing clearance:

• Crankshaft main bearings

• Connecting rod bearings

• Camshaft front bearing

• Idler gear bearing

If the fault is still present, contact the technical communicator at a Cat® dealer.