Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 288

28.3 SPN 110/FMI 3
28.2 SPN 110/FMI 2
This condition is typically coolant temperature out of range (drifted low/high).
NOTE:
When diagnosing rationality erratic data faults (FMI 2) always refer to SILs or SIBs for
any known issues first.
28.2.1 Rationality Check for Temperature Drift
Troubleshoot SPN 110/2 as follows:
1. Check cooling system integrity (lack of heat complaints).
2. Connect the diagnostic tool 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?
[a] If yes, go to step 4.
[b] 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 section 28.2.1.1.
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?
[a] If yes, contact the Detroit Diesel Customer Support Center (313–592–5800).
[b] 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 section 28.2.1.1.
28.2.1.1 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.
28-4
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
(Rev. ) All information subject to change without notice.