GUIDE 1873298 - Caterpillar

Use this procedure in order to troubleshoot an occurrence of a low exhaust temperature or use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes. You must access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".
Table 1
Event Code
Description Conditions which Activate the 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
E857(1) Cyl #17 Exhaust Port Temp Deviating Low
E858(1) Cyl #18 Exhaust Port Temp Deviating Low
E859(1) Cyl #19 Exhaust Port Temp Deviating Low
E860(1) Cyl #20 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 alarm output is activated.
Table 2
Event Code
Description Conditions which Activate the 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
E857(3) Cyl #17 Exhaust Port Temp Deviating Low
E858(3) Cyl #18 Exhaust Port Temp Deviating Low
E859(3) Cyl #19 Exhaust Port Temp Deviating Low
E860(3) Cyl #20 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 shutdown output is activated.
The engine is shut down. Probable Causes
Software for the Integrated Temperature Sensing Module (ITSM)
Monitoring system parameters
Inlet air restriction
Operation with a light load
Faulty thermocouple
Insufficient ignition
Valve lash settings
Low cylinder compressionRecommended Actions
Software for the ITSM and Parameter Settings
Ensure that the latest version of software for the ITSM has been installed in the control module.Monitoring System Parameters
Ensure that the monitoring