COLLAR 2F5970 - Caterpillar

Use this procedure in order to troubleshoot an occurrence of a low exhaust temperature. Use this procedure if one of the following event codes is active.
Table 1
Event Code    
Code and Description     Conditions which Generate this Code     System
Response    
E841(1) Cyl #1 Exhaust Port Temp Deviating Low
E842(1) Cyl #2 Exhaust Port Temp Deviating Low
E843(1) Cyl #3 Exhaust Port Temp Deviating Low
E844(1) Cyl #4 Exhaust Port Temp Deviating Low
E845(1) Cyl #5 Exhaust Port Temp Deviating Low
E846(1) Cyl #6 Exhaust Port Temp Deviating Low
E847(1) Cyl #7 Exhaust Port Temp Deviating Low
E848(1) Cyl #8 Exhaust Port Temp Deviating Low
E849(1) Cyl #9 Exhaust Port Temp Deviating Low
E850(1) Cyl #10 Exhaust Port Temp Deviating Low
E851(1) Cyl #11 Exhaust Port Temp Deviating Low
E852(1) Cyl #12 Exhaust Port Temp Deviating Low
E853(1) Cyl #13 Exhaust Port Temp Deviating Low
E854(1) Cyl #14 Exhaust Port Temp Deviating Low
E855(1) Cyl #15 Exhaust Port Temp Deviating Low
E856(1) Cyl #16 Exhaust Port Temp Deviating Low     The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.     The code is logged.    
Table 2
Event Code    
Code and Description     Conditions which Generate this Code     System
Response    
E841(3) Cyl #1 Exhaust Port Temp Deviating Low
E842(3) Cyl #2 Exhaust Port Temp Deviating Low
E843(3) Cyl #3 Exhaust Port Temp Deviating Low
E844(3) Cyl #4 Exhaust Port Temp Deviating Low
E845(3) Cyl #5 Exhaust Port Temp Deviating Low
E846(3) Cyl #6 Exhaust Port Temp Deviating Low
E847(3) Cyl #7 Exhaust Port Temp Deviating Low
E848(3) Cyl #8 Exhaust Port Temp Deviating Low
E849(3) Cyl #9 Exhaust Port Temp Deviating Low
E850(3) Cyl #10 Exhaust Port Temp Deviating Low
E851(3) Cyl #11 Exhaust Port Temp Deviating Low
E852(3) Cyl #12 Exhaust Port Temp Deviating Low
E853(3) Cyl #13 Exhaust Port Temp Deviating Low
E854(3) Cyl #14 Exhaust Port Temp Deviating Low
E855(3) Cyl #15 Exhaust Port Temp Deviating Low
E856(3) Cyl #16 Exhaust Port Temp Deviating Low     The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.     The code is logged.
The engine is shut down.    If the engine is shut down due to a low exhaust temperature, power to the ECM must cycle in order to restart.Probable Causes
Monitoring system parameters
Inlet air restriction
Cylinder misfire
Faulty thermocouple
Valve lash settings
Low cylinder compressionRecommended Actions
Table 3
Troubleshooting Test Steps     Values     Results    
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.
   
E841
through
E856
   
Result: An associated code is present.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code