Figure 1.1 – ECM Diagnostic Tests

The Engine State Monitor displays the active control state of an engine, including any active derates. This feature helps identify the root cause of an engine’s performance issue.

To Perform the Test:

Open and connect the Cummins INSITE Software. (Refer to: How to Connect CUMMINS Engines using Cummins INSITE Software.)

Select ECM Diagnostic Tests from the INSITE Viewbar.

In the ECM Diagnostic Tests Wizard, select Engine State Monitor (refer to Figure 1.1).

Click Next to open the Engine State Monitor Test window.

Figure 1.2 – Engine State Monitor

Follow the instructions displayed in the Instructions and Status boxes.

Initial Conditions:

Engine running.

Steps:

Click Start.

Monitor the Engine Operating State.

Click Stop to end the test.

Additional Information:

Operate the vehicle on a chassis dynamometer or drive it under the same conditions where the performance issue occurs.

Click Start to initiate the test.

Figure 1.3 – Engine State Monitor (Start)

Operate the vehicle as described in the additional information section.

Figure 1.4 – Low Speed Governor State

Figure 1.5 – High Speed (All Speed Accelerator)

Click Stop to end the test.

Figure 1.6 – Test Stopped

Click Back to return to the ECM Diagnostic Tests Wizard.

Engine State Descriptions

Aftertreatment Regeneration Active – The engine is performing a regeneration of the diesel particulate filter.

Air Density Limit State – The engine is derating due to high altitude.

Air Fuel Control Derate – Fueling is limited due to low oxygen (boost pressure), usually during acceleration.

All Speed Governor – Controls engine speed when the throttle pedal is depressed (see Figure 1.5).

All Speed Governor Application – Controls speed when the all-speed governor is enabled.

Alternate Torque – Active when the alternate torque feature is enabled.

Alternator Failure Warning – Indicates alternator failure; check alternator function.

Altitude Derate – Limits engine torque at high altitudes.

Ambient Derate State – Limits torque output due to ambient conditions.

Anti-Theft Derate – Engine derating due to anti-theft activation.

Automotive Governor – Controls engine speed when the throttle is depressed.

Charge Manager State – Limits charge pressure to protect the air handling system.

Coolant Derate State – Limits engine torque due to high coolant temperature.

Crank State – Engine is cranking and starting.

Cruise Control – Active when cruise control is engaged.

Data Link Powertrain Protection State – Torque limited by powertrain protection.

Data Link Speed – Torque controlled by a J1939 device (e.g., transmission).

Data Link Torque Derate – Torque controlled via J1939 communication.

EGR Fueling Limit State – Normal state during max fueling operation.

Engine Brake – Active when engine brakes are engaged.

Engine Overspeed – Speed exceeds overspeed limit.

Engine Protection – Limited torque due to engine protection state.

Engine Protection Derate – Engine derated due to protection activation.

Engine Startup Oil Limit – Limits throttle until oil pressure stabilizes.

Engine Stop – Key switch is on, engine is not running.

Engine Warm-Up Protection – Limits power until oil pressure and temperature stabilize.

Firetruck Governor – Controls engine when firetruck governor is enabled.

Fuel System Derate – Fuel system fault limiting torque or speed.

Fueling High-Speed Governor State – Engine at maximum speed.

High Fuel Temperature Engine Protection – Torque limited due to fuel temperature.

Industrial Auxiliary Governor – Controls speed in industrial applications.

Industrial Engine Speed Cruise Control – Cruise control active in industrial applications.

Limp Home – Throttle disabled due to active pedal fault.

Load-Based Speed Control – Active when load-based speed control is enabled.

Low Speed Governor State – Engine idling with throttle released (see Figure 1.4).

Maximum Throttle – Engine operating at maximum torque.

Momentary Engine Override – Speed overridden momentarily (e.g., transmission shift).

Noise Control Derate – Injection timing adjusted for noise reduction.

OBD Fueling Derate – Torque limited due to an OBD fault.

Out of Gear – Transmission in neutral or clutch disengaged.

Partial Throttle Limit State – Hybrid governor controlling engine.

Powertrain Protection Derate – Torque limited for powertrain protection.

Primary/Secondary – Multi-unit synchronization feature active.

PTO – Power Take-Off mode active.

PTO Derate – Torque limited in PTO mode.

Road Speed Governor State – Speed limited by road speed governor settings.

Setup for Dynamometer – Configured for unrestricted dyno testing.

Shutdown – Engine in shutdown process.

Top2 Derate – Torque limited by Eaton Top 2 transmission.

Top2 Speed – Speed limited by Eaton Top 2 transmission.

Top2 Torque – Torque limited by Eaton Top 2 transmission.

Torque Rate Limit – Fuel system fault limiting torque output.

Turbocharger Fuel Control State – Limits fuel to reduce exhaust temperature.

Turbocharger Speed Derate – Limits torque to reduce turbocharger speed.

Turbocharger Surge Limit – Surge limit exceeded; check turbocharger.

Vehicle Acceleration Management State – Acceleration rate limited.

Vehicle Speed Sensor Diagnostic – Speed limited due to missing speed source.

Contact Us

Whatsapp: +84.858.966.333
Facebook: VIETVehicle Remote Delete Service
YouTube: VIETVehicle – ECM Delete Tuning
Tiktok: VIETVehicle.com
Website: VIETVehicle.com