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Oil Pressure – Engine Protection with an Oil Pressure Switch
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 143 PID: P100 SPN: 100 FMI: 1 LAMP: Yellow SRT: |
Oil pressure signal indicates oil pressure below the low engine protection limit. |
Power and/or speed derate and possible engine shutdown if engine protection shutdown feature enabled. |
 Oil Pressure Sensor Circuit
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Circuit Description
The oil pressure switch is used by the electronic control module (ECM) to detect the presence of lubricating oil pressure.
Component Location
The oil pressure switch is located on the engine block, below and to the right of the ECM. Refer to Procedure 100-002 for a detailed component location view.
Shop Talk
- Confirm that the oil pressure sensor supply voltage is between (+) 4.5 and 5.25 VDC at the sensor.
- Verify, with the driver, the engine speed at which the fault occurs. If the engine is being operated at too low of a speed under load, the oil pressure can drop below the engine protection limits.
- Connect a manual gauge to monitor the actual oil pressure of the engine.
- The fault will trigger if lubricating oil pressure drops below 41 kPa [6 psi] for 5 seconds while the engine is running.
Refer to Troubleshooting Fault Code t05-143sw
Last Modified: 26-Oct-2010
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