SPN 94 - FMI 1 (Fault Codes: Fuel Pressure Low) - Detroit Diesel Diagnostic Link (DDDL) Software

SPN 94 FMI 1
Fuel Pressure Low (Detroit 60 Series) 

Figure 1.1 - Fuel Pressure Low (DD EEC) 

#Follow the STEPS:
1). Connect DETROIT Engine (DDEC) using Detroit Diesel Diagnostic Link (DDDL v6.46). Read More: How to Connecting DETROIT Engine using Detroit Diesel Diagnostic Link (DDDL).

2). Once connected, open Diagnostics - Fault Codes menu.
Figure 1.2 - Fuel Pressure Low (PID 94 - FMI 1)

3). Troubleshooting Help
DDC Code # (Flashed) = 48
PID = 94
FMI = 1
DDEC Description = Fuel Pressure Low

#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
→Not all Engines use a Fuel Pressure Sensor.
For gas Engines, code 48 indicates that the air inlet pressure has dropped below a calibration limit.

#Troubleshooting Flash Code 48:
Monitoring Fuel Delivery Pressure through Normal/Diagnostic Instrumentation on DDDL. Read More: Normal Instrumentation using Detroit Diesel Diagnostic Link (DDDL) Software
→In this case, at 1545 rpm (Fuel Delivery Pressure is 33.5 psi). 
Figure 1.3 - Normal Instrumentation (Press ^2)
→This code is a mechanical fault. Check for reasons for Low Fuel Pressure.

#Action recommended
→Check Fuel Supply. 
→Replace Fuel Filter (Water Separator, Main/ Secondary Filter). 

#Fuel Pressure at Various Speeds
→Std. Engine Speed (rpm) and Fuel Pressure (psi/ kPa)
  • 600 rpm = 15-22 psi (103-152 kPa) 
  • 1200-1300 rpm = 30-45 psi (207-310 kPa)
  • 1800-2100 rpm = 65-80 psi (448-552 kPa)
If the Fuel Pressure is 0 psi, please check/ replace the Fuel Pressure Sensor. 


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