COVER 1333439 - Caterpillar

Table 1
J1939 Code and Description Comments
92-0
Engine Percent Load At Current Speed : High - most severe (3) The engine load has exceeded the trip point and the delay time has expired.
The engine power is reduced.
The code is logged.
92-15
Engine Percent Load At Current Speed : High - least severe (1) The engine load has exceeded the trip point and the delay time has expired.
The engine power is reduced.
The code is logged. Probable Causes
Engine overload
Cylinder misfire
Low Heating Value (LHV)Recommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Engine Overload
Note: When the load that is applied to the engine is too large, the engine will run in the lug condition. When the engine is running in the lug condition, engine rpm does not increase with an increase of fuel.
Load
Result: The engine is not being overloaded.
Proceed to Test Step 2.
Result: The engine is being overloaded.
Repair: Reduce engine load to an acceptable limit.
If the problem is not resolved, proceed to Test Step 2.
2. Check for a Cylinder Misfire
Note: A cold cylinder will cause the other cylinders to overload.
Misfire
Result: There is not a cylinder misfire.
Proceed to Test Step 3.
Result: There is a cylinder misfire.
Repair: Troubleshoot the cause of the misfire. Refer to Troubleshooting, "Engine Misfires, Runs Rough, or Is Unstable" for additional information.
If the problem is not resolved, proceed to Test Step 3.
3. Determine the Low Heating Value (LHV)
A. Obtain a fuel analysis.
Note: If the quality of the gas is inconsistent, obtain several analyses over a time.
B. Enter the data into Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)".
C. Verify that the exhaust emissions are correct.
LHV
Result: The LHV is NOT OK.
Repair: Use Cat ET to program the results for the "Fuel Specific Heat Ratio", "Fuel Quality", and "Gas Specific Gravity" parameters. Refer to Systems Operation, "Electronic Control System Parameters" for additional information.
Program the "Fuel Quality" parameter to the average value of the LHV. Adjust the engine operation according to Testing and Adjusting, "BTU and Precombustion Chamber Adjustments".
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).