14620-P8A-A01 Honda ARM ASSY., IN. ROCKER (Honda Code 6481428).

Illustration 1 g06205789The Electronic Modular Control Panel (EMCP) requires enablement of "Gas Blending Control" to begin blending gas. It is required to enable "Gas Blending Control" at the EMCP upon power cycle if gas blending operations are requested.Gas Substitution Status
The Gas Substitution status parameter has three possible states, active, inactive, or locked inactive. These states are used to identify if the engine operating conditions to enable gas blending have been met.7 Potential Reason Codes
No reduction
Abnormal cylinder pressure
Diagnostic Trouble Code (DTC) active
Low engine load
High turbocharger inlet temperature
High detonation level
High fuel actuator valve commandNo Reduction
The reason code, No Reduction, is displayed when the following items are within acceptable limits and operating properly:
Load
Speed
Fuel quality
Fuel supply
Coolant temperature
Intake manifold air temperature
Atmospheric pressureFactory 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.Abnormal Cylinder Pressure
The reason code, High Cylinder Pressure, will be displayed when the ICPS has detected cylinder pressures are higher than allowed. The gas substitution will remain active but at a reduced substitution percentage.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 code on the engine is present, the focus should be resolving the active code. Refer to Table 1 for the list of active codes.
Table 1
J1939 Troubleshooting Procedure
107-16 Troubleshooting, Inlet Air Is Restricted
639-9 Troubleshooting, Data Link - Test
970-31 The emergency stop switch is activated. Reset the emergency stop switch. The power to the engine Electronic Control Module (ECM) must be cycled before the engine is allowed to restart.
1180-0 Troubleshooting, Turbocharger Turbine Temperature Is High
1180-3 Troubleshooting, Sensor Signal (PWM) - Test
1180-4 Troubleshooting, Sensor Signal (PWM) - Test
1181-0 Troubleshooting, Turbocharger Turbine Temperature Is High
1181-3 Troubleshooting, Sensor Signal (PWM) - Test
1181-4 Troubleshooting, Sensor Signal (PWM) - Test
1390-3 Troubleshooting, Sensor Signal (Analog, Active) - Test
1390-4 Troubleshooting, Sensor Signal (Analog, Active) - Test
1390-15 Troubleshooting, Fuel Pressure Problem (Gas System)
1390-17 Troubleshooting, Fuel Pressure Problem (Gas System)
2452-14 Troubleshooting, Generator Output Power - Test
2809-16 Troubleshooting, Inlet Air Is Restricted 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. The gas substitution will remain active but at a reduced substitution percentage.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 15% or greater for gas substitution to be enabled.Lost load signal
Verify that the EMCP is generating a load signal.
Verify that the ECM is receiving the load signal through Cat® Electronic Technician (ET).Incorrect 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. The gas substitution will remain active but at a reduced substitution percentage.Probable Causes:
Turbine inlet temperature reads high
Replace thermocouples if one is radically off from other
Injector leakage
High inlet manifold pressure
High inlet manifold temperature
Turbocharger performance issue
Intake restriction
Exhaust restrictionRefer 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 ICPSs have measured cylinder pressures in the range that detonation occurs.Probable Causes:
Gas quality
High inlet manifold pressure
High inlet manifold temperature
Incorrect timing calibration
Faulty circuit for the ICPS sensor
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. The gas substitution will remain active but at a reduced substitution percentage.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 689 kPa (12 psig to 100 psig)The supply pressure can be lowered below the recommended 207 kPa to 241 kPa (30 psig to 35 psig) if the volume is sufficient to allow enough gas flow.Gas Quality
Low BTU heat value gaseous fuel
High inert gas levelRefer to Application and Installation Guide, LEBW4977, "Gaseous Fuels"