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35.1 SPN 175/FMI 3
This diagnosis is typically engine oil temperature circuit failed high.
35.1.1
Open Circuit/Short to Power Check
Check as follows:
1. Turn the ignition the 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 175/3 is active, go to step 5.
3. Disconnect the Fuel Supply Temperature 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
35.1.1.1.
[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
35.1.1.1.
5. Disconnect the EOT Sensor.
6. Check the resistance across pins 1 and 2 of the EOT Sensor.
[a] If the resistance is greater than 4 kΩ, replace the sensor. Refer to section 35.1.1.1.
[b] If he resistance is less than 4 kΩ, go to step 7.
7. Turn the ignition On (key ON, engine OFF).
8. Measure the voltage between pins 1 and 2 of the EOT Sensor harness connector.
[a] If the voltage is between 2.75 and 3.24 volts, Refer to section 35.1.1.1.
[b] If the voltage is less than 2.75 volts, go to step 9.
9. Measure the voltage between pin 2 of the EOT Sensor harness connector and ground.
[a] If the voltage is between 2.75 and 3.24 volts, repair the open circuit between pin 1
of the EOT Sensor harness connector and pin 55 of the 120–pin MCM connector.
Refer to section 35.1.1.1.
[b] If the voltage is less than 2.75 volts, repair the open circuit between pin 2of the
EOT Sensor harness connector and pin 108 of the 120–pin MCM connector.
Refer to section 35.1.1.1.
All information subject to change without notice.
Copyright © 2007 DETROIT DIESEL CORPORATION
SERIES 60 DDEC VI TROUBLESHOOTING GUIDE
35-3
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Troubleshooting
