Section 4.1
Diagnostic Troubleshooting
A Diagnostic Trouble Code (DTC) is generated when a condition exists that prevents the engine from operating at peak efficiency. The codes can be for engine protection or performance.
Section 4.1.1
SHUTDOWN-ENGINE PROTECTION FAULT CODE = RED
A shutdown-engine protection DTC is activated when a engine operating condition exists that can cause immediate damage to the engine and the engine should be shut down until the condition is corrected to prevent additional damage.
Note: All shutdown-engine protection fault codes must be enabled in the DDEC Vehicle Control Unit (DDEC-VCU) by the user. If not enabled, these codes act as derate-engine protection fault codes.
Section 4.1.2
DERATE-ENGINE PROTECTION FAULT CODE = BLUE
A derate-engine protection DTC is activated when a engine operating condition exists that can cause engine damage if left unattended. The engine slowly looses power so that the operator knows to correct the condition to prevent additional damage. However; if damage is not imminent, the operator can override the shutdown and limp to safety to correct the problem.
Section 4.1.3
PERFORMANCE FAULT CODES = YELLOW
A performance fault code is activated when specific conditions occur within a given amount of time that the calibration determines is not “normal”.
Example: For SID 146, DDEC Engine Control Unit (DDEC-ECU) uses the EGR temperature sensor to monitor EGR temperature.
Conditions that can cause SID 146 include but are not limited to:
- EGR Temperature above Normal
- EGR Temperature below Normal
- Erratic Data
- EGR Valve not Responding
- Bad EGR Temperature Sensor
| MBE 900 and MBE 4000 EGR Technician's Manual - 7SE940 |
| Generated on 10-13-2008 |