Series 50G/60G Troubleshooting – Section 5.13 PID 94, FMI 4, Flash Code 38, Fuel Pressure Sensor Input Voltage Low

Section 5.13
PID 94, FMI 4, Flash Code 38, Fuel Pressure Sensor Input Voltage Low

Input voltage from the Fuel Pressure Sensor is low due to an open wire or a short.‪

Section 5.13.1
Troubleshooting PID 94, FMI 4, Flash Code 38

Troubleshoot as follows:‪

1. Check wire 905 (yellow, Fuel Pressure Sensor) cavity M-1 in the Engine Sensor Harness (ESH) 30–pin connector to see if it is open (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin C (fuel pressure) in the Fuel Pressure Sensor connector. Repair or replace any open wires, pins, and sockets.
   

   Figure 1. Engine Sensor Harness 30–pin Connector

   1. If the code is still active, go to step .
   2. If the code is on longer active, refer to "5.13.2 Verification" .
2. Check wire 905 (yellow, Fuel Pressure Sensor) cavity M-1 in the ESH 30–pin connector for a short to ground (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin C (fuel pressure) in the Fuel Pressure Sensor connector. If there is a short, repair or replace the wire(s), pins, and sockets.
   1. If the code is still active, call Detroit Diesel Technical Service.
   2. If the code is on longer active, refer to "5.13.2 Verification" .

Section 5.13.2
Verification

Verify troubleshooting as follows: ‪

1. Check the DDR to see if PID 94, FMI 4, Flash Code 38 is still active.
   1. If the code is still active, go to step 2.
   2. If the code is not active, troubleshooting is complete.
2. If the code is still active, call Detroit Diesel Technical Service.