Series 50G/60G Troubleshooting – Section 5.34 PID 174, FMI 3, Flash Code 23, Fuel Temperature Sensor Input Voltage High

Section 5.34
PID 174, FMI 3, Flash Code 23, Fuel Temperature Sensor Input Voltage High

The Fuel Temperature Sensor input voltage is high due to an open wire or a short.‪

Section 5.34.1
Troubleshooting PID 174, FMI 3, FLASH CODE 23

Troubleshoot as follows:‪

1. Check wire 472 (orange, fuel temperature) cavity R-3 in the Engine Sensor Harness (ESH) 30–pin connector for a short to ground (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (fuel temperature) in the Fuel Temperature Sensor connector. If there is a short, replace or repair the wire(s).
   

   Figure 1. Engine Sensor Harness 30–pin Connector

   1. If the code is still active, go to step .
   2. If the code is no longer active, refer to "5.34.2 Verification" .
2. Check wire 472 (orange, fuel temperature) cavity R-3 in the ESH 30–pin connector to see if it is open (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (fuel temperature) in the Fuel Temperature Sensor connector. Replace or repair any open wire(s).
   1. If the code is still active, go to step .
   2. If the code is no longer active, refer to "5.34.2 Verification" .
3. Check wire 472 (orange, fuel temperature) cavity R-3 for a short to wire 416 (gray, sensor supply voltage, +5VDC) cavity W-1 in the ESH 30–pin connector (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (fuel temperature) in the Fuel Temperature Sensor connector. If there is a short, replace or repair the wire(s).
   1. If the code is still active, go to step .
   2. If the code is no longer active, refer to "5.34.2 Verification" .
4. Check wire 472 (orange, fuel temperature) cavity R-3 in the ESH 30–pin connector for a short to +12V/+24V (see Figure "Engine Sensor Harness 30–pin Connector" ). Also check pin B (fuel temperature) in the Fuel Temperature Sensor connector. If there is a short, replace or repair the wire(s).
   1. If the code is still active, call Detroit Diesel Technical Service.
   2. If the code is no longer active, refer to "5.34.2 Verification" .

Section 5.34.2
Verification

Verify troubleshooting as follows: ‪

1. Check the DDR to see if PID 174, FMI 3, Flash Code 23 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.