Section 29.4
SPN 110/FMI 14

This condition is typically coolant temperature out of range (drifted low/high).‪

Note: When diagnosing rationality erratic data faults (FMI 14) always refer to SILs or SIBs for any known issues first.

Section 29.4.1
Rationality Check for Temperature Drift

Check as follows:‪

1. Check cooling system integrity (lack of heat complaints).
2. Connect DDDL 7.0 and monitor the engine oil temperature and the engine coolant temperature.
3. With the engine running at idle and the engine oil temperature above 160°, is the coolant temperature within X degrees of the oil temperature?
   1. If yes, go to step 4 .
   2. If no, disconnect the ECT Sensor and the MCM connector. Bridge pins X and X of the sensor, measure the resistance at the MCM between pins X and X. If the resistance is greater than 3 Ω, repair the harness. If the resistance is less than 3 Ω, replace the sensor. Refer to "29.4.1.1 Verify Repairs" .
4. With the engine running at 1500 rpm and oil temperature above 160°, check the coolant temperature. Is it within X degrees of the oil temperature?
   1. If yes, contact the Detroit Diesel Customer Support Center (313–592–5800).
   2. If no, disconnect the ECT Sensor and the MCM connector. Bridge pins X and X of the sensor and measure resistance at the MCM between pins X and X. If the resistance is greater than 3 Ω repair the harness. If the resistance is less than 3 Ω, replace the sensor. Refer to "29.4.1.1 Verify Repairs" .

Section 29.4.1.1
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.