F1807 Mercury PIN-GROOVE

Table 1
Event Code
Description Conditions which Activate the Code System Response
E841(1) Cyl #1 Exhaust Port Temp Deviating Low 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 The shutdown output is activated. The code is logged. The engine is shut down.
E842(1) Cyl #2 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E842(3) Cyl #2 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E843(1) Cyl #3 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E843(3) Cyl #3 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E844(1) Cyl #4 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E844(3) Cyl #4 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E845(1) Cyl #5 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E845(3) Cyl #5 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E846(1) Cyl #6 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E846(3) Cyl #6 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E847(1) Cyl #7 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E847(3) Cyl #7 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E848(1) Cyl #8 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E848(3) Cyl #8 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E849(1) Cyl #9 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E849(3) Cyl #9 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E850(1) Cyl #10 Exhaust Port Temp Deviating Low 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 The shutdown output is activated. The code is logged. The engine is shut down.
E851(1) Cyl #11 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E851(3) Cyl #11 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E852(1) Cyl #12 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E852(3) Cyl #12 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E853(1) Cyl #13 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E853(3) Cyl #13 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E854(1) Cyl #14 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E854(3) Cyl #14 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E855(1) Cyl #15 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E855(3) Cyl #15 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down.
E856(1) Cyl #16 Exhaust Port Temp Deviating Low The alarm output is activated. The code is logged.
E856(3) Cyl #16 Exhaust Port Temp Deviating Low The shutdown output is activated. The code is logged. The engine is shut down. Probable Causes
Misfire
Problem with a thermocouple
Incorrect gas admission valve lash
Low cylinder compressionRecommended Repairs
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 Suspect Thermocouples
Observe the temperatures from the thermocouples after the engine is shut off.When the engine is operating properly, the temperatures from similar locations are reduced at a similar rate. Also, the temperatures from similar locations are comparable.If any discrepancies are found, switch the suspect thermocouple for another thermocouple. If the temperature problem follows the thermocouple, replace the thermocouple.If the temperature problem stays at the original location of the suspect thermocouple, investigate the cause for the low temperature.Gas Admission Valve Lash
Adjust the gas admission valve lash according to Systems Operation/Testing and Adjusting, "Engine Timing Procedures".Check the Cylinder Compression
Measure the cylinder pressures of the suspect bank in order to check for problems that are related to compression.If low compression is found, investigate the cause of the low compression. Make repairs, as needed.