DAMPER & PULLEY GP 6N7379 - Caterpillar

Probable Causes
Inlet system leak
Engine operating conditions
Failed exhaust back pressure valve
High altitude
Obstructed Air-to-Air Aftercooler (ATAAC)
Illustration 1 g03844797
Example of an electronic service tool screenshot of the histogram. This histogram is populated when the engine system has calculated a condition in which high exhaust temperatures are present. A diagnostic code will not be logged when the system calculates a high exhaust temperature condition. The engine will be derated in order to protect the engine system. This situation is normal under most circumstances and no additional troubleshooting is necessary.
Note: Information from this histogram is to be used with active and logged diagnostic trouble codes. This histogram is for information only.Complete the procedure in the order in which the steps are listed.
Table 1
Troubleshooting Test Steps Values Results
1. Check for Inlet System Leakage
A. Apply a light load to the engine and check for leakage from the inlet system downstream of the low-pressure turbocharger.
Boost leaks
Result: Leakage was found.
Repair: Repair the leaks.