0398339 JOHNSON FUEL CONNECTOR & HOSE

Table 1
Diagnostic Trouble Codes
J1939 Code and Description System Response
173-0
Engine Exhaust Gas Temperature : High - most severe (3) The exhaust gas temperature is higher than expected for the engine operating conditions.
The code is logged.
173-15
Engine Exhaust Gas Temperature : High - least severe (1) The exhaust gas temperature is higher than expected for the engine operating conditions.
The code is logged.
173-16
Engine Exhaust Gas Temperature : High - moderate severity (2) The exhaust gas temperature is higher than expected for the engine operating conditions.
The code is logged. Probable Causes
Associated codes
Boost Leak
Engine operating conditions
Obstructed aftercooler
Table 2
Troubleshooting Test Steps Values Results
1. Check for Associated Diagnostic Codes
A. Establish communication between Cat ET and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Determine if a code is active or logged.
Associated Diagnostic Codes
Result: An associated diagnostic code is not active or logged.
Proceed to Test Step 2.
Result: An associated diagnostic code is active or logged.
Repair: Troubleshoot the associated code. Refer to Troubleshooting, "Diagnostic Trouble Codes" to troubleshoot the associated diagnostic code.
If the problem is not resolved, proceed to Test Step 2.
Table 3
DTC with associated derate? Data logged in this histogram? Interpretation
No Yes Derate was probably caused by the exhaust temperature derate.
Yes Yes There may be multiple causes for derate since this exhaust temperature histogram only logs data when it has the largest derate ( another derate may have been active due to a diagnostic trouble code, but a larger exhaust temperature derate was applied).
Yes No Derate was probably not caused by the exhaust temperature derate.
Illustration 1 g06034140
Example of Cat ET screenshot of the histogram. This histogram is populated when the engine system has calculated a condition in which high exhaust temperatures are present. A fault code will not be logged when the system calculates a high exhaust temperature condition, but will activate a de-rate to the engine to protect the engine system. This action 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 informational if no diagnostic codes are active or logged.Complete the procedure in the order in which the steps are listed.
Table 4
Troubleshooting Test Steps Values Results
2. Check for Boost Leakage
A. Apply a light load to the engine and check for boost leakage.
Boost Leaks
Result: Boost leakage was not found.
Proceed to Test Step 3.
Result: Boost leakage was found.
Repair: Repair the leaks. Return the unit to service.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Engine Operating Conditions
A. Check the histogram to determine if the high exhaust temperature was due to normal operation.
When possible, interview the operator. Determine if the engine is being operated under heavy load. Ensure that the engine is being operated at the proper engine speed.
If derates are suspected, reset histogram and return the unit to service. If the histogram repopulates without fault codes, derate was under normal engine operation.
Normal Operation
Result: The code was not logged during a heavy load.
Proceed to Test Step 4.
Result: The code was logged during a heavy load.
Repair: Reduce the load on the engine. Return the unit to service.
If the problem is not resolved, proceed to Test Step 4.
4. Check for an Obstructed Aftercooler
A. The intake manifold air temperature can increase if the flow through the aftercooler is obstructed. Check the aftercooler for obstructions or debris. Ensure that the flow of air or coolant through the aftercooler is adequate.
Obstructed Aftercooler
Result: The engine aftercooler was obstructed.
Repair: Clear any obstructions. Return the unit to service.
Verify that the repair eliminated the problem.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).