Series 50G/60G Troubleshooting – Section 5.10 PID 94, FMI 0, Flash Code 47, Fuel Pressure High

Section 5.10
PID 94, FMI 0, Flash Code 47, Fuel Pressure High

The fuel pressure is high due to a faulty sensor connection, a faulty sensor or problem in the fuel system.‪

Section 5.10.1
Troubleshooting PID 94, FMI 0, Flash Code 47

Troubleshoot as follows:‪

1. Check wire 905 (yellow, Fuel Pressure Sensor) in the Engine Sensor Harness (ESH) 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ). If there is a short or an open wire, repair or replace the wire(s), pins, and sockets.
   

   Figure 1. Engine Sensor Harness 30–pin Connector

   1. If PID 94, FMI 0, Flash Code 47 is still active, go to step .
   2. If PID 94, FMI 0, Flash Code 47 is not active, refer to "5.10.2 Verification" .
2. Check the Fuel Pressure Sensor (FPS) using the DDEC Sensor Tester J 37164 (see Figure "DDEC Sensor Tester J 37164" ).
   

   Figure 2. DDEC Sensor Tester J 37164

3. Disconnect the sensor. On Series 60G and 50G engines with a high pressure fuel system, the FPS is installed in a tee at the inlet to the low pressure regulator (see Figure "Fuel Pressure Sensor Location" ).
   

   Figure 3. Fuel Pressure Sensor Location

4. Disengage the locking tang on the three-wire connector. Grasp the body of the connector and gently pull it free of the FPS.
5. Use the appropriate wrench on the hex end of the FPS to unscrew it from the inlet tee.
6. Connect the sensor to the tester at the correct connector.
7. Clip the power leads to the 12 volt power source.
8. Plug in a volt OHM meter. The tester will power up the sensor.
   1. If the sensor should be replaced, refer to "5.10.1.1 Replacing the Fuel Pressure Sensor" .
   2. If the sensor does not need to be replaced, refer to "5.10.1.2 Checking the Fuel System" .

Section 5.10.1.1
Replacing the Fuel Pressure Sensor

The FPS is non-servicable and should be replaced as a unit. No adjustment is required.‪

Replace the FPS as follows:‪

Note: The FPS is an electrical device. Use care on installation.

1. On the replacement FPS, use Loctite® Pipe Sealant with Teflon, PT-7260, or equivalent on all but the first two threads of the FPS to prevent leaks.
2. Screw FPS into the regulator inlet tee.
3. Engage locking tang of the three wire connector to the FPS.
4. Turn the ignition to the ON position. Observe the DDR for any diagnostic code(s).
   1. If PID 94, FMI 0, Flash Code 47 is still active, call Detroit Diesel Technical Service.
   2. If PID 94, FMI 0, Flash Code 47 is not active. Refer to "5.10.2 Verification" .

Section 5.10.1.2
Checking the Fuel System

Check the fuel system and repair if necessary. When the check and/or repairs are finished:‪

1. If the code is still active, call Detroit Diesel Technical Service.
2. If the code is no longer active, refer to "5.10.2 Verification"

Section 5.10.2
Verification

Verify troubleshooting as follows:‪

1. Check the DDR to see if PID 94, FMI 0, Flash Code 47 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.

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