Table of Contents
Advertisement
34.1 SPN 174/FMI 3
SPN 174/FMI 3 indicates a SFT Sensor open circuit or short to power.
34.1.1
Open Circuit/Short to Power Check
Check as follows:
1. Turn the ignition ON (key ON, engine OFF).
2. Check for multiple codes.
[a] If codes 110/3, 174/3, 175/3 and 3510/3 are active at the same time, go to step 3.
[b] If only fault 174/3 is active, go to step 5.
3. Disconnect the Supply Fuel Temperature Sensor (ECT Sensor).
4. Measure the voltage between pin 1 of the SFT Sensor and ground.
[a] If the voltage is greater than 2.75 volts, repair the short to power between pin 55 of
the MCM 120–pin connector and the Engine Coolant Temperature Sensor, the Engine
Oil Temperature Sensor and the Supply Fuel Temperature Sensor. Refer to section
34.1.1.1.
[b] If no voltage is present on pin 1 of the SFT Sensor, repair the open between pin 55 of
the MCM 120–pin connector and the Engine Coolant Temperature Sensor, the Engine
Oil Temperature Sensor and the Supply Fuel Temperature Sensor. Refer to section
34.1.1.1.
5. Disconnect the SFT Sensor.
6. Measure the resistance across pins 1 and 2 of the SFT Sensor. See Figure 34-1.
Figure 34-1
Supply Fuel Temperature Sensor
[a] If the resistance is greater than 4k Ω, replace SFT Sensor. Refer to section 34.1.1.1.
All information subject to change without notice.
Copyright © 2007 DETROIT DIESEL CORPORATION
SERIES 60 DDEC VI TROUBLESHOOTING GUIDE
34-3
Advertisement
Table of Contents
Troubleshooting
