SPN 94 - FMI 1 (Fault Codes: Fuel Pressure Low) - Detroit Diesel Diagnostic Link (DDDL) Software
SPN 94 FMI 1
SPN94 FMI1
Fuel Pressure Low (Detroit 60 Series)
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| 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.
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| Figure 1.2 - Fuel Pressure Low (PID 94 - FMI 1) |
3). Troubleshooting Help
DDC Code # (Flashed) = 48
#Troubleshooting Flash Code 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
NOTE:
→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).
→In this case, at 1545 rpm (Fuel Delivery Pressure is 33.5 psi).
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| 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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