Active Diagnostic Codes
An Active diagnostic code represents a problem with the electronic control system. This problem should be corrected as soon as possible. When an active diagnostic code is generated, a display module such as the Electronic Monitoring System (EMS) may produce a warning.
The ECM can generate the following actions when an active diagnostic code is present:
- The ECM logs the code into permanent memory.
- The ECM generates a diagnostic code on the CAT Data Link.
- The ECM generates a Flash Code that will be displayed on the diagnostic lamp.
- The warning lamp will be turned on.
Possible Performance Effect of Active Diagnostic Codes
| Possible Performance Effect of Active Diagnostic Codes | ||||||
|---|---|---|---|---|---|---|
| Flash Code | CID/FMI Code | Description of Code | Engine Misfires | Low Power | Reduced Engine Speed | Engine Shutdown |
| N/A | 545-05 | Ether Start Relay open/short to +batt | ||||
| 545-06 | Ether Start Relay short to ground | |||||
| 21 | 262-03 | 5 Volt Sensor DC Power Supply short to +batt | ||||
| 262-04 | 5 Volt Sensor DC Power Supply short to ground | |||||
| 263-03 | Digital Sensor Supply short to +batt | |||||
| 263-04 | Digital Sensor Supply short to ground | |||||
| 24 | 100-03 | Engine Oil Pressure open/short to +batt | ||||
| 100-04 | Engine Oil Pressure short to ground | |||||
| 25 | 273-00 | Turbo Outlet Pressure above normal | ||||
| 273-03 | Turbo Outlet Pressure open/short to +batt | |||||
| 273-04 | Turbo Outlet Pressure short to ground | |||||
| 26 | 274-03 | Atmospheric Pressure open/short to +batt | ||||
| 274-04 | Atmospheric Pressure short to ground | |||||
| 27 | 110-03 | Engine Coolant Temperature open/short to +batt | X | X | X | |
| 110-04 | Engine Coolant Temperature short to ground | X | X | X | ||
| 32 | 91-08 | Throttle Position signal abnormal | X | X | ||
| 34 | 342-02 | Loss of Secondary Engine Speed signal | X | X (1) | ||
| 37 | 94-03 | Fuel Pressure open/short to +batt | ||||
| 94-04 | Fuel Pressure short to ground | |||||
| 42 | 261-13 | Engine Timing calibration required | X | X | X | X |
| 51 | 168-02 | System Voltage intermittent/erratic | X | X | X | |
| 53 | 254-12 | Electronic Control Module Error | X | X | X | X |
| 56 | 253-02 | Personality Module mismatch | X (2) | |||
| 268-02 | Check Programmable Parameters | X | X | |||
| ( 2 ) | Fuel injection will not occur and the engine will not start. |
Logged Diagnostic Codes
When the ECM generates a diagnostic code, the ECM logs the code in permanent memory. The ECM has an internal diagnostic clock. The ECM will record the hour of the first occurrence of the diagnostic code. The ECM will record the hour of the last occurrence of the diagnostic code. The ECM will record the number of occurrences of the code. This information is a valuable indicator for troubleshooting intermittent problems. Some diagnostic codes may log occurrences that did not result in complaints. The most likely cause of an intermittent problem is a faulty connection or damaged wiring. The next likely cause is a component failure. The least likely cause is the failure of the ECM. Diagnostic codes that are logged repeatedly may indicate a problem that needs special investigation.
If the symptoms continue, use the proper procedure for troubleshooting the symptoms that have been experienced by the operator.
Note: Always clear logged diagnostic codes after investigating and correcting the problem which generated the code.
Logged Events
The ECM can log events. Events refer to engine operating conditions such as low oil pressure or high coolant temperature. Logged events usually indicate a mechanical problem instead of an electronic system problem.
 | |
| Illustration 1 | g00592364 |
The diagram shows an example of output voltage from the Coolant Temperature Sensor. The diagram shows the ECM response to that voltage. The above diagram is a reference. Do not use the diagram to troubleshoot the Coolant Temperature Sensor. | |
The Electronic Service Tool can be used to turn ON the engine monitoring for a specific sensor. When the monitoring is turned ON, the sensor value and any event diagnostic will appear on an electronic monitoring module or on the ET. When the features are turned OFF, the engine monitoring will be disabled, but the event is logged in the ECM.
| 3500B System Event Codes | ||
|---|---|---|
| Flash Codes | Event Code (1) | Description |
| 35 | E004 | Engine Overspeed Shutdown |
| E007 | High Aftercooler Temperature Derate | |
| E008 | High Aftercooler Temperature Shutdown | |
| E009 | High Altitude Derate | |
| E012 | High Crankcase Pressure Derate | |
| E013 | High Crankcase Pressure Shutdown | |
| 61 | E015 | High Engine Coolant Temperature Derate |
| 61 | E016 | High Engine Coolant Temperature Shutdown |
| 17 | E017 | High Engine Coolant Temperature Warning |
| E020 | High Engine Oil Temperature Warning | |
| E021 | High Exhaust Temperature Derate | |
| 64 | E027 | High Inlet Air Temperature Warning |
| E031 | Air Filter Restriction Derate | |
| E038 | Low Engine Coolant Temperature Warning | |
| 46 | E039 | Low Engine Oil Pressure Derate |
| 46 | E040 | Low Engine Oil Pressure Shutdown |
| E043 | Low System Voltage Warning | |
| E085 | Engine Shutdown Overridden | |
| 63 | E095 | Fuel Filter Restriction Warning |
| E097 | Engine Derate Overridden | |
| E099 | Engine Oil Filter Restriction Warning | |
| E100 | Low Engine Oil Pressure Warning | |
| E101 | High Crankcase Pressure Warning | |
| E173 | High Exhaust Temperature Warning | |
| E272 | Inlet Air Restriction Warning | |
| E279 | High Aftercooler Temperature Warning | |
| ( 1 ) | The Events refer to engine operating conditions. |
Programmable Engine Parameters
You can program the ECM to activate the following features for Industrial engines:
- Engine Warning
- Engine Derate
- Engine Shutdown
Note: The ECM will activate a warning lamp for the above conditions: solid for an engine warning, flash for an engine derate and flash for an engine shutdown. In the case of multiple derates, the derate that limits the most power will be displayed.
The Electronic Service Tool can be used to turn ON the engine monitoring for a specific feature. When the monitoring is turned ON, the feature and any event will appear on an electronic monitoring module or on the ET. The ECM can generate the following actions when an event becomes active:
- The ECM logs the event.
- The ECM generates an event code on the CAT Data Link.
- The ECM generates a Flash Code that will be displayed on the diagnostic lamp.
- The warning lamp will be turned on.
When the features are turned OFF, the engine monitoring will be disabled, but the event is logged in the ECM. The ECM will not react for an active event when the feature is turned OFF. For example, the ECM will not activate a warning, derate, or shutdown for an event if the feature is turned OFF.
Diagnostic Terminology
Module Identifier (MID)
The module identifier (MID) indicates the electronic module that generated the diagnostic code.
- The module identifier (036) indicates the engine ECM.