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28.3 SPN 110/FMI 3
SPN 110/FMI 3 indicates that the Engine Coolant Temperature Sensor (ECT Sensor) input to
the MCM has exceeded 95% of the sensor supply voltage. The diagnostic condition is typically
engine coolant temperature open circuit (110/3).
28.3.1
Multiple Code Check
Check for multiple codes as follows:
1. Turn the ignition ON (key ON, engine OFF).
2. Plug in the diagnostic tool.
3. Read the active codes.
[a] If codes 110/3, 174/3 and 175/3 are active at the same time, repair the open circuit
between pin 73 of the 120–pin MCM connector and pin 1 of the ECT Sensor, the
EOT Sensor and the Supply Fuel Temperature Sensor. Refer to section 28.3.2.1.
[b] If only fault 110/3 is active, refer to section 28.3.2.
28.3.2
Open Circuit Check
Perform the following steps to troubleshoot an ECT Sensor open circuit fault:
1. Disconnect the ECT Sensor.
2. Measure the resistance across pins 1 and 2 of the ECT Sesnor.
[a] If the resistance is greater than 4 kΩ, replace the sensor. Refer to section 28.3.2.1.
[b] If the resistance is less than 4 kΩ, go to step 3.
3. Turn the ignition ON (key ON, engine OFF).
4. Measure the voltage between pins 1 and 2 of the ECT Sensor harness connector.
[a] If the voltage is between 2.75 and 3.25 volts, go to step 6.
[b] If the voltage is less than 2.75 volts, go to step 5.
5. Measure the voltage between pin 2 of the ECT Sensor harness connector and ground.
[a] If the voltage is between 2.75 and 3.25 volts, repair the open circuit between pin 1
of the ECT Sensor harness connector and pin 73 of the 120–pin MCM connector
(see Figure 28-1). Refer to section 28.3.2.1.
All information subject to change without notice.
6SE568
Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
(Rev. )
MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
28-5
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Table of Contents
Troubleshooting
