DD15 SPN 110/FMI 3 Troubleshooting

SPN 110/FMI 3

This code indicates the engine coolant outlet temperature circuit has failed high.‪

Check as follows:‪

1. Check for multiple codes.
   1. If 110/3, 174/3, 175/3 and 4076/3 are present, go to step 6 .
   2. If only 110/3 is present, go to the next step.
2. Disconnect the Engine Coolant Outlet Temperature Sensor.
3. Turn the ignition On (key ON, engine OFF).
4. Measure the voltage between pins 1 and 2 of the Engine Coolant Outlet Temperature Sensor harness connector.
   1. If the voltage is between 2.8 and 3 volts, replace the Engine Coolant Outlet Temperature Sensor. Refer to “27.1.1 Verify Repairs” .
   2. If the voltage is less than 2.8 volts, go to the next step.
5. Measure voltage between pin 2 of the Engine Coolant Outlet Temperature Sensor and ground.
   1. If the voltage is between 2.8 and 3 volts, repair the wire between pin 1 of the Engine Coolant Outlet Temperature Sensor connector and pin 55 of the MCM 120–pin connector. Refer to “27.1.1 Verify Repairs” .
   2. If the voltage is less than 2.8 volts, repair the wire between pin 2 of the Engine Coolant Outlet Temperature Sensor connector and pin 110 of the MCM 120–pin connector. Refer to “27.1.1 Verify Repairs” .
6. Measure the voltage between pins 1 and 2 of the Engine Coolant Outlet Temperature Sensor harness connector.
   1. If the voltage is greater than 3 volts, repair the short to power on one of the follwoing MCM pins: 77, 80, 108 or 110. Refer to “27.1.1 Verify Repairs” .
   2. If no voltage is present, repair the open between pin 55 of the MCM 120–pin connector and the Coolant Out, Coolant In, Engine Oil and Supply Fuel Temperature Sensors. Refer to “27.1.1 Verify Repairs” .