3BJ-76060-0 Tohatsu RECTIFIER

Table 1
Event Code
Description Conditions which Activate the Code System Response
E841 (1) Cyl #1 Exhaust Port Temp Deviating Low Warning The cylinder exhaust temperature is less than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point and the delay time has expired. The alarm output is activated. The code is logged.
E841 (3) Cyl #1 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E842 (1) Cyl #2 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E842 (3) Cyl #2 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E843 (1) Cyl #3 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E843 (3) Cyl #3 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E844 (1) Cyl #4 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E844 (3) Cyl #4 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E845 (1) Cyl #5 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E845 (3) Cyl #5 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E846 (1) Cyl #6 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E846 (3) Cyl #6 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E847 (1) Cyl #7 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E847 (3) Cyl #7 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E848 (1) Cyl #8 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E848 (3) Cyl #8 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E849 (1) Cyl #9 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E849 (3) Cyl #9 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E850 (1) Cyl #10 Exhaust Port Temp Deviating Low Warning The cylinder exhaust temperature is less than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point and the delay time has expired. The alarm output is activated. The code is logged.
E850 (3) Cyl #10 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E851 (1) Cyl #11 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E851 (3) Cyl #11 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E852 (1) Cyl #12 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E852 (3) Cyl #12 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E853 (1) Cyl #13 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E853 (3) Cyl #13 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E854 (1) Cyl #14 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E854 (3) Cyl #14 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E855 (1) Cyl #15 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E855 (3) Cyl #15 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down.
E856 (1) Cyl #16 Exhaust Port Temp Deviating Low Warning The alarm output is activated. The code is logged.
E856 (3) Cyl #16 Exhaust Port Temp Deviating Low Shutdown The shutdown output is activated. The code is logged. The engine is shut down. Note: Refer to Troubleshooting, "Engine Monitoring System" for information on trip points and delay times.Probable Causes
Inlet air restriction
Operation with a light load
Active diagnostic code from the Integrated Temperature Sensing Module (ITSM)
A faulty thermocouple
Insufficient ignition
Low cylinder compressionRecommended Repairs
Inlet Air Restriction
Note: Inlet air restriction can cause uneven exhaust port temperatures. Cylinders at the front half of the engine may have exhaust port temperatures that are lower than the exhaust port temperatures for the cylinders at the rear half of the engine by 10 °C (50 °F) to 20 °C (68 °F). If this occurs, measure the inlet air restriction for each turbocharger. Make repairs in order to equalize the inlet air restriction for both turbochargers.Check for Misfire
Operation with a low load can result in low exhaust temperatures. Operate the engine at low idle or near low idle in order to identify a misfire problem.Troubleshoot the cause of the misfire. Refer to Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable".Check for Diagnostic Codes from the Integrated Temperature Sensing Module (ITSM)
Use Caterpillar Electronic Technician (ET) to check