Section 48.1
Description of Flash Code 48
Flash Code 48 indicates that the ECM has detected that the Fuel Pressure has dropped below a programmed limit. This condition is normally associated with a restriction in the fuel supply system:
- Plugged fuel filter
- Low fuel supply
Note: Not all engines use a fuel pressure sensor, see Figure "Fuel Pressure Sensor" .
For gas engines, code 48 indicates that the air inlet pressure has dropped below a calibration limit.
Flash Code 48 is also used to identify the EGR Delta-Pressure, or EGR temperature is below programmed limits. This condition is typically due to:
- EGR valve not opening completely
- EGR valve not opening at all – leaking CAC.
- Leaking EGR piping/hoses.
Flash Code 48 also indicates the exhaust gas temperature fell below calibrated limits, or EGR Delta-Pressure fell below calibrated limits. Possible causes include:
- EGR valve not opening
- EGR valve not opening fully
- Leaking CAC
Flash Code 48 also indicates the TCI (Turbo Compressor Inlet) or TCO (Turbo Compressor Outlet) temperature fell below the calibrated limits. Possible causes include:
- Leaking CAC
- Leaking inlet piping
- EGR valve not opening properly
| DDEC III/IV Single ECM Troubleshooting Guide - 6SE497 |
| Generated on 10-13-2008 |