ROLLER GP-CR- 2869824 - Caterpillar

Use this procedure to troubleshoot an incorrect coolant pressure. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description Comments
3342-1
Engine Coolant Pump Differential Pressure : Low - most severe (3) The pressure drop across the water pump is lower than expected for the current engine operating conditions.
3342-17
Engine Coolant Pump Differential Pressure : Low - least severe (1) The pressure drop across the water pump is lower than expected for the current engine operating conditions.
3342-18
Engine Coolant Pump Differential Pressure : Low - moderate severity (2) The pressure drop across the water pump is lower than expected for the current engine operating conditions.
5708-15
Engine Coolant Pressure #2 : High - least severe (1) The coolant system pressure is higher than expected for the current engine operating conditions.
5708-17
Engine Coolant Pressure #2 : Low - least severe (1) The coolant system pressure is lower than expected for the current engine operating conditions.
Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
110-0 E361 (3) Troubleshooting, "Coolant Temperature Is High"
110-15 E361 (1) Troubleshooting, "Coolant Temperature Is High"
110-16 E361 (2) Troubleshooting, "Coolant Temperature Is High"
111-1 E2143 (3) Troubleshooting, "Coolant Level Is Low"
111-17 E2143 (1) Troubleshooting, "Coolant Level Is Low"
111-18 E2143 (2) Troubleshooting, "Coolant Level Is Low"
Illustration 1 g06079639
Cooling system schematic
Probable Causes
Code
Coolant pressure sensor location
Coolant level
Hose routing
Radiator cap
Expansion tank (if equipped)
Foaming or Aeration
Leaks
Internal leaks
Water pump
Steam or hot coolant can cause severe burns.Do not loosen the filler cap or the pressure cap on a hot engine.Allow the engine to cool before removing the filler cap or the pressure cap.
Recommended Actions
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Verify the Coolant Pressure Sensor Location
A. Turn the keyswitch to the ON position.
B. Connect Cat ET.
C. Use Cat ET to monitor the following parameters:
- Engine Coolant Pump Intake Pressure
- Engine Coolant Pressure
Less than 30 kPa (4 psi)Differential Pressure
Result: There was less than 30 kPa (4 psi) difference between the two pressure sensor readings.
Proceed to Test Step 3.
Result: There was more than 30 kPa (4 psi) difference between the two pressure sensor readings.
Repair: The coolant pressure sensor connectors are installed on the correct coolant pressure sensor. Swap the connectors for the coolant pressure sensors.
Proceed to Test Step 11.
3. Verify the Coolant Level
A. Verify that the coolant is filled to the correct level.
If the coolant level is too low, air will get into the cooling system. Air in the cooling system will cause a reduction in coolant flow and pressure.
B. Check the cooling system for coolant leaks.
Coolant Level
Result: The coolant level is correct.
Proceed to Test Step 4.
Result: The coolant level is not correct.
Repair: Determine the cause of the low coolant level. Refer to Troubleshooting, "Coolant Level Is Low" for additional information.
Proceed to Test Step 11.
4. Check the Cooling System