TUBE ASSEM. 2S1641 - Caterpillar

Use this procedure to troubleshoot a high fuel temperature. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description CDL Code and Description Comments
174-0
Engine Fuel Temperature 1 : High - most severe (3) E363 (3)
High Fuel Supply Temperature The fuel temperature sensor on the secondary filter head is higher than expected.
174-15
Engine Fuel Temperature 1 : High - least severe (1) E363 (1)
High Fuel Supply Temperature The fuel temperature sensor on the secondary filter head is higher than expected.
174-16
Engine Fuel Temperature 1 : High - moderate severity (2) E363 (2)
High Fuel Supply Temperature The fuel temperature sensor on the secondary filter head is higher than expected.
3468-0
Engine Fuel Temperature 2 : High - most severe (3) E770 (3)
High Fuel Rail Temperature The fuel temperature sensor on the high-pressure fuel pump is higher than expected.
3468-15
Engine Fuel Temperature 2 : High - least severe (1) E770 (1)
High Fuel Rail Temperature The fuel temperature sensor on the high-pressure fuel pump is higher than expected.
3468-16
Engine Fuel Temperature 2 : High - moderate severity (2) E770 (2)
High Fuel Rail Temperature The fuel temperature sensor on the high-pressure fuel pump is higher than expected.
Table 2
Associated Codes
J1939 Code CDL Code Troubleshooting Procedure
174-3 174-3 Troubleshooting, "Sensor Signal (Analog, Passive) - Test"
174-4 174-4 Troubleshooting, "Sensor Signal (Analog, Passive) - Test"
1077-11 1684-11 Troubleshooting, "Fuel Injection Pump Circuit - Test"
1077-12 1684-12 Troubleshooting, "Fuel Injection Pump Circuit - Test"
3468-3 2323-3 Troubleshooting, "Sensor Signal (Analog, Passive) - Test"
3468-4 2323-4 Troubleshooting, "Sensor Signal (Analog, Passive) - Test" If high fuel temperature shuts down the engine, cycle the power to the engine Electronic Control Module (ECM) to restart.Probable Causes
Codes
Fuel level
Fuel cooler
SensorRecommended Actions
Table 3
Troubleshooting Test Step Value Result
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.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: An E363 or 174 code is active or logged.
Proceed to Test Step 2.
Result: An E770 or 3468 code is active or logged.
Proceed to Test Step 5.
2. Check the Fuel Tank Level
A. Turn the keyswitch to the OFF position.
B. Visually inspect the fuel level to make sure that the tank level is not too low.
Fuel Level
Result: The fuel level is not low.
Proceed to Test Step 3.
Result: The fuel level is low.
Proceed to Test Step 6.
3. Check the Fuel Cooler for a Restriction
A. Turn the keyswitch to the OFF position.
B. Visually inspect the fuel cooler to see if there are any blockages or obstructions.
Restrictions
Result: There was not debris or restrictions in the fuel cooler.
Proceed to Test Step 4.
Result: There was debris or restrictions in the fuel cooler.
Repair: Clean or replace the fuel cooler.
Proceed to Test Step 6.
4.