ENGINE AR-COMPLETE 2189653 - Caterpillar

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 is present for an exhaust port temperature.
Proceed to the next step.
Result: No active codes
STOP
   
2. Check the Monitoring System Parameters
A. Ensure that the monitoring system parameters for the exhaust temperature module are set correctly.
B. Ensure that the monitoring system parameters for the exhaust port temperatures are set correctly.
   
Parameters
   
Result: The module parameters are OK.
Continue with this step.
Result: The module parameters are NOT OK.
Repair: Refer to Troubleshooting, "Event Codes" for information that relates to the default parameters, ranges, and delay times of the monitoring system parameters that are for the exhaust port temperatures.
Result: The port temperatures parameters are OK.
Proceed to the next step.
Result: The port temperatures parameters are NOT OK.
Repair: Refer to Troubleshooting, "Event Codes" for information that relates to the default parameters, ranges, and delay times of the monitoring system parameters that are for the exhaust port temperatures.
If the problem is not resolved, proceed to the next step.
   
3. Check for Inlet Air Restriction
Note: Inlet air restriction can cause uneven exhaust port temperatures. Cylinders at the front half