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ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – Lubricating Oil Pressure High

Symptom Tree  t104

This is symptom tree t104
Cause Correction

Coolant temperature is below specification

Refer to the Coolant Temperature is Below Normal symptom tree.
 

Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedures 007-037 and 007-013. Use the oil type recommended in Section V of the operation and maintenance manual.

 

Lubricating oil pressure switch, gauge, or sensor is malfunctioning or is not in the correct location

Check the oil pressure switch, gauge, or sensor for correct operation and location. Refer to the OEM service manual.
 

Lubricating oil pressure sensor or circuit is malfunctioning (electronic controlled fuel system)

Check the lubricating oil pressure sensor and circuit. Refer to Procedure 019-066 in Troubleshooting and Repair Manual, CM850 Electronic Control System, ISC and ISL Engines, Bulletin 4021416, or Procedure 019-066 in Troubleshooting and Repair Manual, Electronic Control System, ISC, QSC8.3 and ISL Engines, Bulletin 3666271.
 

Main oil pressure regulator is malfunctioning

Check the main oil pressure regulator assembly. Refer to Procedure 007-029.

 
Last Modified:  29-Jul-2005
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