Fault Codes: Fuel Pressure Low (Detroit Diesel Diagnostic Link)

Fuel Pressure Low

Figure 1.1 - Fuel Pressure Low (DDEC IV - Series 60)

Here 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

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.
→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, and Main/Secondary Fuel 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)

Read More:

Open Fault Codes on DETROIT Engine using Detroit Diesel Diagnostic Link (DDDL)

Open and Changing the Customer Calibration using Detroit Diesel Diagnostic Link (DDDL)

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