FAN ASSEM. 4N6722 - Caterpillar

Table 1
Event Codes
CDL Codes and Description Conditions which Generate this Code System Response
E99 (1)
High Oil Filter Differential Pressure The difference between the filtered oil pressure and the unfiltered oil pressure is greater than the trip point pressure. The code is logged.
E99 (2)
High Oil Filter Differential Pressure The difference between the filtered oil pressure and the unfiltered oil pressure is greater than the trip point pressure. The code is logged.
E99 (3)
High Oil Filter Differential Pressure The difference between the filtered oil pressure and the unfiltered oil pressure is greater than the trip point pressure. The code is logged. Probable Causes
Diagnostic codes and event codes
Oil filter element
Sensor problem
Sensor circuit componentRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 2
Troubleshooting Test Step Value Result
1. Check for Codes
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Download the "Product Status Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Determine if the diagnostic trouble code that directed to this procedure is present.
D. Look for active diagnostic codes that are associated with the system for the event code that directed to this procedure.
E99
Result: An associated code is present.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: An E99 code is present.
Proceed to the next step.
Result: No active codes
STOP
2. Replace the Oil Filters
A. Restart the engine and check for an active event code for the filters that were changed.
E99
Result: After starting the engine, the E99 event code is no longer active for the filter that was changed.
STOP
Result: After starting the engine, the E99 event code remained active for the filters that were changed.
The problem is not resolved, proceed to the next step.
3. Check the Oil Pressure Sensors
A. Use Cat ET to compare the status of the following parameters while the engine is OFF:
- Unfiltered Oil Pressure (abs)
- Engine Oil Pressure (abs)
Parameter
value
Result: The sensors read atmospheric pressure while the engine is off.
Result: A sensor does not read atmospheric pressure while the engine is off.
Repair: Troubleshoot the sensor circuit.
Proceed to the next step.
4. Inspect Sensor Circuit Component
A. Inspect the suspected sensor, wiring, and connectors for damage and corrosion. Refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to intermittent electrical problems.
Component
Result: A circuit component is damaged or corroded.
Repair: Repair or replace the circuit component.
Result: A circuit component is not damaged or corroded.
Repair: Replace the sensor.