Detroit Diesel EPA07 Series 60 DDEC VI Troubleshooting Manual page 411

5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps
illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel
Customer Support Center at 313–592–5800.
34.2 SPN 174/FMI 4
SPN 174/FMI 4 indicates a SFT Sensor short to ground.
34.2.1 Short to Ground Check
Check as follows:
1. Disconnect the SFT Sensor.
2. Disconnect the 120-pin MCM connector.
3. Measure the resistance across pins 1 and 2 of the SFT Sensor connector.
[a] If resistance is less than 5 Ω, repair short between wires 55 and 77 of the 120-pin
MCM connector. Refer to section 34.2.1.1.
[b] If resistance is greater than 5 Ω, go to step 4.
4. Measure the resistance between pin 2 of the SFT Sensor harness connector and ground.
[a] If resistance is less than 5 Ω, repair the short circuit between pin 2 of the SFT Sensor
harness connector and ground. Refer to section 34.2.1.1.
[b] If resistance is greater than 5 Ω, review steps 3 through 4. If the results are the same,
contact Detroit Diesel Customer Support Center (313–592–5800).
34.2.1.1 Verify Repairs
Verify repairs as follows:
1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps
illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel
Customer Support Center at 313–592–5800.
All information subject to change without notice.
Copyright © 2007 DETROIT DIESEL CORPORATION
SERIES 60 DDEC VI TROUBLESHOOTING GUIDE
34-5