Each diagnostic code consists of the following items: a component identifier (CID), a failure mode identifier (FMI) and "DIAG" indicator. These items are shown on the upper display. The diagnostic code indicator can be active or inactive. The CID identifies the component that has a problem. The FMI describes the nature of the diagnostic code. When the "DIAG" indicator is FLASHING, the diagnostic code is active. This means that the diagnostic code is present. When the "DIAG" indicator is ON CONTINUOUSLY, the diagnostic code is inactive and the CID FMI is recorded in the fault log. See Systems Operation, "Fault Log Viewing OP1" in order to view the fault log. When the "DIAG" indicator is not showing, there are NO diagnostic codes that are detected or recorded. Service personnel interpret the identifiers in order to assist with troubleshooting.
When a diagnostic code occurs, the GSC FLASHES the "DIAG" indicator. The GSC determines the type of problem. There are two types of problems: an alarm fault and a shutdown fault. Then, the GSC FLASHES the corresponding fault alarm indicator or fault shutdown indicator. The CID FMI is immediately shown on the upper display when there is a shutdown fault. When there is an alarm fault, the alarm code key is pressed. Then, the CID FMI is shown on the upper display.
The GSC has a fault log to help with troubleshooting of diagnostic codes. Inactive diagnostic codes (CID FMI) are recorded in the fault log for viewing at a later time. The number of occurrences are totalled and the number of occurrences are shown on the upper display. An active alarm fault becomes inactive when the problem is no longer occurring. Also, the engine control switch (ECS) should be turned to the OFF/RESET position for shutdown faults. The "DIAG" indicator is FLASHING when the problem is currently occurring. The indicator is on continuously if the problem occurred previously.. See Testing And Adjusting, "Fault Log Viewing OP1".
During troubleshooting, it is sometimes necessary to disconnect the harness connector from the GSC and diagnostic codes are created. Because of internal circuitry, the GSC recognizes this condition as an FMI 03 or FMI 02 for certain components. An FMI 03 or FMI 02 describes the voltage that is above normal. This fact is also used as an aid in the troubleshooting process. Clear these created diagnostic codes after the particular diagnostic code is corrected and the diagnostic code is cleared. The following diagnostic codes are recorded in a properly operating system when the harness connector is removed from the GSC.
CID 0100 FMI 02 - Pressure Sensor (Engine Oil)
CID 0100 FMI 03 - Pressure Sensor (Engine Oil)
CID 0110 FMI 02 - Temperature Sensor (Engine Coolant)
CID 0110 FMI 03 - Temperature Sensor (Engine Coolant)
CID 0111 FMI 03 - Fluid Level Sensor (Engine Coolant)
CID 0190 FMI 03 - Speed Sensor (Engine)
CID 0336 FMI 02 - Switch (Engine Control)
CID 0590 FMI 09 - Engine ECM
An FMI 02 describes an incorrect signal.
Clear diagnostic codes after the problem is investigated or the problem is corrected. This will avoid a confusion during a future service call. The "DIAG" indicator is OFF when all diagnostic codes are cleared from the fault log and no active diagnostic codes exist. See Testing And Adjusting, "Fault Log Clearing OP4".
Diagnostic Codes
| Diagnostic Codes (1) |
|
|---|---|
| CID No. / FMI No. | Description |
| CID 100 Pressure Sensor (Engine Oil): | |
| FMI 2 | Incorrect signal |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| CID 110 - Temperature Sensor (Engine Coolant): | |
| FMI 2 | Incorrect signal |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| CID 111 - Fluid Level Sensor (Engine Coolant): | |
| FMI 3 | Voltage above normal |
| CID 168 - Electrical System Voltage: | |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| CID 190 - Speed Sensor (Engine): | |
| FMI 2 | Incorrect signal |
| FMI 3 | Voltage above normal |
| CID 248 - CAT Data Link: | |
| FMI 9 | Abnormal update |
| CID 268 - EMCP Electronic Control (Generator Set): | |
| FMI 2 | Incorrect signal |
| CID 269 - Sensor Power Supply: | |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| CID 333 - Alarm Module Control: | |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| CID 334 - Spare Output: | |
| FMI 3 | Voltage above normal |
| FMI 4 | Voltage below normal |
| CID 336 - Switch (Engine Control): | |
| FMI 2 | Undefined state |
| CID 441 - Electronic Governor Relay: | |
| FMI 12 | Failed component |
| CID 442 - Generator Fault Relay: | |
| FMI 12 | Failed component |
| CID 443 - Crank Termination Relay: | |
| FMI 12 | Failed component |
| CID 444 - Starting Motor Relay: | |
| FMI 12 | Failed component |
| CID 445 - Run Relay: | |
| FMI 12 | Failed component |
| CID 446 - Air Shutoff Relay: | |
| FMI 12 | Failed component |
| CID 447 - Fuel Control Relay: | |
| FMI 12 | Failed component |
| CID 500 - EMCP Electronic Control (Generator Set): | |
| FMI 12 | Failed component |
| CID 566 - Unexpected Shutdown: | |
| FMI 7 | Improper mechanical response |
| CID 590 - Engine Electronic Control Module: | |
| FMI 9 | Abnormal update |
| ( 1 ) | For troubleshooting, see the procedure with the same CID number and the same FMI. |
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| Illustration 1 | g00615969 |
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| Illustration 2 | g00608337 |
Example
The "E" in the example shown in 2 indicates that on EUI engines, the engine ECM has generated the diagnostic code. This assists the operator in diagnosing problems with the EUI engine. See Troubleshooting, RENR2227, "3406E and 3456 EPG Engines"for more information.