Section 28.3
SPN 111/FMI 4

This fault is typically a circuit failed low. ‪

Check as follows:‪

1. Turn the ignition ON (key On, engine OFF).
2. Read the diagnostic codes displayed.
   1. If other faults are active in addition to fault 111/4, troubleshoot the other faults first.
   2. If only fault 111/4 is active, go to the next step.
3. Disconnect the ECL Sensor.
4. Disconnect the CPC #3 connector (21-pin).
5. Measure the resistance across pins 1 and 2 of the ECL Sensor connector.
   1. If the resistance is less than 5 Ω, repair the short between the wires 2 and 11 of the CPC #3 connector. Refer to "28.3.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, go to the next step.
6. Measure the resistance between pin 1 of the ECL Sensor harness connector and ground.
   1. If the resistance is less than 5 Ω, repair the short circuit between pin 1 of the ECL Sensor harness connector and ground. Refer to "28.3.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, go to the next step.
7. Measure the resistance between pin 2 of the ECL Sensor harness connector and ground.
   1. If the resistance is less than 5 Ω, repair the short circuit between pin 2 of the ECL Sensor harness connector and ground. Refer to "28.3.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, review the steps already taken.. If the results are the same, call the Detroit Diesel Customer Support Center (313–592–5800).

Section 28.3.1
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.

   ENGINE EXHAUST ‪
   To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

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.