BOLT 2803616 - Caterpillar

Use this procedure in order to troubleshoot an occurrence of a low exhaust temperature. Also, use this procedure if one of the following engine events is active. Refer to Troubleshooting, "Diagnostic Trouble Codes" for information related to engine events that will cause the activation of diagnostic codes. 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 Systems Operation, "Engine Monitoring Parameters".
Table 1
Engine Events
J1939 Code and Description Conditions which Activate the Code System
Response
5686-17 Engine Exhaust Gas Port 1 Difference from Average Temperature:Low-least severe (1)
5687-17 Engine Exhaust Gas Port 2 Difference from Average Temperature:Low-least severe (1)
5688-17 Engine Exhaust Gas Port 3 Difference from Average Temperature:Low-least severe (1)
5689-17 Engine Exhaust Gas Port 4 Difference from Average Temperature:Low-least severe (1)
5690-17 Engine Exhaust Gas Port 5 Difference from Average Temperature:Low-least severe (1)
5691-17 Engine Exhaust Gas Port 6 Difference from Average Temperature:Low-least severe (1)
5692-17 Engine Exhaust Gas Port 7 Difference from Average Temperature:Low-least severe (1)
5693-17 Engine Exhaust Gas Port 8 Difference from Average Temperature:Low-least severe (1)
5694-17 Engine Exhaust Gas Port 9 Difference from Average Temperature:Low-least severe (1)
5695-17 Engine Exhaust Gas Port 10 Difference from Average Temperature:Low-least severe (1)
5696-17 Engine Exhaust Gas Port 11 Difference from Average Temperature:Low-least severe (1)
5697-17 Engine Exhaust Gas Port 12 Difference from Average Temperature:Low-least severe (1) 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
Engine Events
J1939 Code and Description Conditions which Activate the Code System
Response
5686-15 Engine Exhaust Gas Port 1 Difference from Average Temperature:High-least severe (1)
5687-1 Engine Exhaust Gas Port 2 Difference from Average Temperature:Low-most severe (3)
5688-1 Engine Exhaust Gas Port 3 Difference from Average Temperature:Low-most severe (3)
5689-1 Engine Exhaust Gas Port 4 Difference from Average Temperature:Low-most severe (3)
5690-1 Engine Exhaust Gas Port 5 Difference from Average Temperature:Low-most severe (3)
5691-1 Engine Exhaust Gas Port 6 Difference from Average Temperature:Low-most severe (3)
5692-1 Engine Exhaust Gas Port 7 Difference from Average Temperature:Low-most severe (3)
5693-1 Engine Exhaust Gas Port 8 Difference from Average Temperature:Low-most severe (3)
5694-1 Engine Exhaust Gas Port 9 Difference from Average Temperature:Low-most severe (3)
5695-1 Engine Exhaust Gas Port 10 Difference from Average Temperature:Low-most severe (3)
5696-1 Engine Exhaust Gas Port 11 Difference from Average Temperature:Low-most severe (3)
5697-1 Engine Exhaust Gas Port 12 Difference from Average Temperature:Low-most severe (3) 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 Engine Temperature Module (ETM)
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 ETM and Parameter Settings
Ensure that the latest version of software for the ETM has been installed in the control module.Monitoring System Parameters
Ensure that the monitoring system parameters