WASHER-THRUST 8E8215 - Caterpillar

The maximum substitution value is determined by a combination of factory mapping and dynamically monitored parameters. The control system actively monitors the following inputs to determine the maximum substitution allowed at a driven load:
The detonation sensor input
The engine exhaust temperature input
Fuel actuator valve position6 Potential Reason Codes
No reduction
Diagnostic Trouble Code (DTC) active
Low engine load
High turbocharger inlet temperature
High detonation level
High fuel actuator valve commandNo Reduction
The reason code, NONE (No Reduction), is displayed when the following items are within acceptable limits and operating properly:
Load
Speed
Fuel quality
Fuel supplyFactory testing has determined the maximum allowable substitution for specific speeds and loads with optimum fuel quality. The maximum allowable substitution is to ensure safe engine operation and compliance with the published emissions limits.When this reason code is active, the substitution is at the expected percentage based on the speed and load the engine is running.Diagnostic Trouble Code (DTC) Active
The reason code, DIAG ACTIVE (Diagnostic Trouble Code (DTC) Active), is present when there is an active engine diagnostic code. The active engine diagnostic code has caused the DGB control system to eliminate or reduce substitution.When an active diagnostic code on the engine is present, the focus should be resolving the active code.Low Engine Load
The reason code, LOW LOAD (Low Engine Load), is present when the engine load is less than the required minimum to allow substitution.Probable Causes:
Low load
The engine is being operated below the minimum load range for gas substitution.
For drilling generator packages, the load must be approximately 18% for gas substitution to be enabled.Lost load signal
Verify that the EMCP is generating a load signal.
Verify the ECM is receiving the load signal through Cat ETIncorrect load signal
Check the load signal that is being generated on the EMCP with the load calculated by the customer controller.High Turbocharger Inlet Temperature
The reason code, HI TURBO TEMP (High Turbocharger inlet Temperature), is present when turbine inlet temperature exceeds the set value for the programmable monitoring system.Probable Causes:
Individual cylinder temperature reads high
Replace Thermocouples if one is radically off from other
Turbine inlet temperature reads high
Injector leakage
High inlet manifold pressure
High inlet manifold temperature
Turbocharger performance issue
Intake restriction
Exhaust restriction Refer to Troubleshooting, "Inlet Air Is Restricted".Refer to Troubleshooting, "Exhaust Temperature Is High".High Detonation Level
The reason code, HI DET LEVEL (High Detonation Level), is present when the detonation sensors are registering a vibration level in the frequency range that detonation events occur.Probable Causes:
Gas quality
High inlet manifold pressure
High inlet manifold temperature
Incorrect timing calibration
Faulty circuit for the detonation sensor
Incorrect detonation sensor torque
Intake restriction
Turbocharger damage
Excessively low inlet manifold temperature
Valve lashRefer to the Troubleshooting, "Detonation Occurrence".High Fuel Valve Command
The ECM controls the fuel actuator valve to deliver gaseous fuel to the engine. The reason code, HI VALVE CMD (High Fuel Valve Command), is present when fuel actuator valve reaches 80% open. Essentially the engine needs more gaseous fuel than can deliver at the maximum fuel valve position.Probable Causes:
Low supply pressure
The recommended supply pressure range is 207 kPa to 241 kPa (30 psig to 35 psig)
The acceptable supply pressure range is 83 kPa to 276 kPa (12 psig to 40