The INSITE QST30 G-Drive is a generator-set controller. It is used on generator sets from Cummins/Onan, including the QST30 G-Drive.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 115 | Engine Speed Sensor (ESS) Circuit | ||
| 135 | QST30 G-Drive Fault Code 135 | Repair or replace the engine harness, repair the engine harness adaptor cable or engine harness extension cable(s), whichever is found faulty | |
| 141 | Oil Pressure Sensor (OPS) Circuit Fault Code 141 | Repair damaged pins, replace the engine harness, repair or replace the OPS, dry the connector by using electrical contact cleaner, replace the connector seal, check and measure voltages, clear fault codes | |
| 171 | Fault Code 171 not present | ||
| 23 | Overspeed | STEP 1: Kentily the reason for the overspeed, STEP 14: Gneck for Fault Code 171. Fault Code 171 not present engine not reverse powered, STEP 1¢: Check for attemate fuel Neo alternate fuel source, STEP 1D: Check engine rpm with Correct rpm reading servics tool monior. | |
| 234 | Correct rpm reading | ||
| 234 | Engine Overspeed - Engine Protection | The engine speed was above the maximum allowable engine speed. An engine overspeed can be caused by either a fuel system problem or the engine being driven or reverse powered past its maximum allowable speed. | |
| 234 | Fault Code 234 inactive | ||
| 234 | Inspect engine speed sensor | ||
| 342 or 346 | Electronic Control Module (ECM) Memory - Area Faults | ||
| 415 | Engine Power Output Low | ||
| Fault Code | A numeric Cummins code that identifies the fault. |
| Symptom | Cause | Remedy |
|---|---|---|
| Adjustments are not correct | Adjust the overhead settings. Refer to the Operation and Maintenance Manual, QST30 Engine, Bulletin No. 3666134. | |
| Air in the fuel system | Check for air in the fuel system. Completely bleed air from the fuel system. Refer to the Operation and Maintenance Manual, QST30 Engine, Bulletin No. 3666134. | |
| Air intake or exhaust leaks | OK | |
| Air intake system restriction | Check the air intake system for restriction. Clean or replace the air filter and inlet piping as necessary. Refer to the Operation and Maintenance Manual QST30 Engine, Bulletin No. 3666134. | |
| Base engine problem | Check the engine for high crankcase pressure, low compression, static injection timing, damaged piston, camshaft, and other parts. | |
| Battery voltage supply to the electronic control module (ECM) has been lost | Check The Battery connections. Refer to the Operation and Maintenance Manual, QST30 Engine, Bulletin No. 3666134. Check the un-switched battery supply circuit. Refer to Procedure 019-087. | |
| Check the fuel tubes, fuel manifold, and cylinder specification pump is abov heaters, and check the fuel cooler. Refer to the OEM service manuals. | Adjust the overhead settings. refer to the Operation and Maintenance Manual, QST30 Engine, Bulletin No. 3666134. | |
| Coolant temperature sensor is malfunctioning | Check the coolant temperature sensor. Refer to Procedure 019-019, | |
| Electronic control module (ECM) is malfunctioning | Replace the ECM. Refer to Procedure 019-031. | |
| Emergency Stop Signal tripped | Check generator operator interface for Emergency Stop signal. | |
| Engine Acceleration or Response Poor | Test the engine operation while under load. Perform an engine acceleration test. Perform an engine load verify the complaint test. Observe the commanded rack position with INSITE™. | |
| Engine Acceleration or Response Poor (continued) | Fuel inlet restriction Check for fuel inlet restriction. | |
| Engine Speed Sensor (ESS) Fuel shutoff valves are signalon pins 21 and22 cithe de-energized (valves engine hammers electronically closed). | Common Alarm output is energized, indicating engine speed greater than alarm (shutdown) threshold. Overspeed relay driver is energized. | |
| Engine Speed Surges at Low or High Idle | Injector is malfunctioning, Static injection timing is not correct, Fuel pump overflow valve is malfunctioning, Fuel transfer pump is malfunctioning, Fuel injection pump is malfunctioning | Replace the malfunctioning injector, Check the static injection timing when installing the fuel injection pump, Check the overflow valve for correct operation, Remove and test the fuel injection pump, Replace the pump if necessary |
| Engine Will Not Remain Running: Electronic fault codes active or high counts of inactive fault codes | Refer to Section TF in the Troubleshooting and Repair manual for fault code troubleshooting. | |
| Engine Will Not Shut Off | Electronic fault codes active or high counts of inactive fault codes, Stop/Run switch circuit is malfunctioning, Engine is running on fumes drawn into the air intake | Refer to Section TF for fault code troubleshooting, Check the Stop/Run switch circuit, Check the ard ine Coat eae a scoeeary |
| Engine cranks but will not start (Exhaust Smoke) | Fuel Level Low | Fill the supply tank. |
| Engine cranks but will not start (No Exhaust Smoke) | No fuel in tank or tank isolation valve closed | Add fuel to tank or check operation of isolation valve |
| Engine is operating above recommended altitude | Engine performance decreases above recommended altitude. Refer to the Engine Data Sheet for specifications. | |
| Engine is running on fumes drawn into the air intake | Check the air intake ducts. Locate and isolate the source of the fumes. Repair as necessary. Refer to the OEM service manuals. | |
| Engine parasitics are excessive | Check engine driven units for correct operation. Check the cooling fan for correct operation and cycle time. refer to the OEM service manual. | |
| Engine speed sensor (ESS) or circuit is malfunctioning | Check the ESS for correct adjustment and for debris on the sensor. Check the ESS circuit. Refer to Procedure 019-042 and 019-106. | |
| Engine will not reach rated speed (RPM) | Tachometer is not calibrated or is malfunctioning | Compare the tachometer reading with a hand tachometer or an electronic service tool reading. Calibrate or replace the tachometer. |
| Exhaust system restriction | Check the exhaust system for restrictions. | |
| Fuel Consumption Excessive | Fuel leaks, Lubricating oil level is above specification, Lubricating oil does not meet specifications for operating conditions, Environmental factors are affecting fuel consumption, Engine parasitics are excessive, Load is excessive for engine horsepower rating, Electronic fault codes active or high counts of inactive fault codes | Check the fuel lines, fuel connections, and fuel filters for leaks. Check the fuel lines to the supply tanks, Check the oil level. Verify the dipstick calibration and oil pan capacity. Fill the system to the specified level, Change the ail and filters. Use the lubricating oil type recommended in Section V, Consider altitude and ambient air temperature when evaluating fuel consumption, Reduce the load on the engine, Refer to Section TF for fault code troubleshooting |
| Fuel Shutoff Valve is malfunctioning | Functioni Ground (short circuit) shutoff valve or remove FSOV Signal Wire. Refer to Procedures 019-014 and 019-015. | |
| Fuel drain fine restriction | Check the fuel drain lines for restriction. Clear or replace the fuel lines, check valves, or tank vents as necessary. | |
| Fuel drain line restriction | Check the fuel drain lines for restriction. Clear or replace the fuel lines, check valves, or tank vents as necessary. | |
| Fuel grade is not correct for the application or the fuel quality is poor | OK | |
| Fuel injection pump is malfunctioning | Remove and test the fuel injection pump. Replace the pump if necessary. Refer to the Operation and Maintenance Manual, QST30 Engine. Bulletin No. 36666134. | |
| Fuel inlet restriction | Check for fuel inlet restriction. | |
| Fuel pump overflow valve is malfunctioning | Check the overflow valve for correct operation. | |
| Fuel transfer pump inlet screen is plugged | Clean or replace the fuel pump inlet screen. | |
| Fuel transfer pump is malfunctioning | Check the lift pump for correct operation. Check the pump output pressure. Replace the transfer pump if necessary. Refer to the Operation and Maintenance Manual, QST30 Engine, Bulletin No. 3666134. | |
| If engine will not restart | Refer to the Engine Difficulty to Start or Will Not Start symptom tree in Troubleshooting and Repair Manual | |
| Injector is malfunctioning | Replace the malfunctioning injector. Refer to the Operation and Maintenance Manual, QST30 Engine, Bulletin No. 3666134. | |
| Intake manifold air temperature is below specification | Refer to the Coolant Temperature Below Normal symptom tree in the Operation and Maintenance Manual, QST36 Engine, Bulletin No. 3666134. | |
| Load is excessive for engine horsepower rating | Reduce the load on the engine. Refer to the OEM specifications. | |
| OEM engine protection system is malfunctioning | Check the fuel shutoff valve and circuit. Refer to Procedures 019-049 and 019050. Isolate the OEM engine protection system. Follow the OEM service manuals to check for a malfunction. | |
| Overhead adjustments are not correct | Adjust the overhead settings. Refer to the Operation and Maintenance Manual, QST30 Engine, bulletin No. 3666134. | |
| Programmable parameters or selected features are not correct | Check the programmable parameters and the selected features with an electronic service tool. Set the parameters and features again if necessary. | |
| Run signal to the ECM has been lost | Check the Stop/Run switch and circuit. Refer to Procedures 019-014 and 019-015. | |
| Stop/Run switch circuit is malfunctioning | Check the Stop/Run switch circuit. Refer to Procedure 019-015. | |
| Turbocharger oil seal is leaking | Check the turbocharger oil seals for leaks. |
Fault codes and symptom→remedy steps extracted from this controller’s service/owner documentation; verify against the official manual before servicing. Aggregated from the service documentation of generator sets built on this controller.