This diagnosis is typically engine oil temperature out of range (drifted low/high).
NOTE:
When diagnosing rationality erratic data faults (FMI 14) always refer to SILs or SIBs or
any known issues first.
35.3.1
Rationality Check for Temperature Drift
1. Check engine oil level. Add oil if needed and recheck for fault codes. If SPN 175/FMI 14 is still active, go to step 2.
2. Disconnect the Engine Oil Temperature Sensor.
3. Inspect the Engine Oil Temperature Sensor for bent, spread or corroded pins. If pin damage is found, repair as necessary or replace the sensor. Refer to section 35.3.1.1.
35.3.1.1
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.
