Section 30.3
SPN 111/FMI 4

This fault is typically a circuit failed low. ‪

Section 30.3.1
Short to Ground Check

Check for a short to ground 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 step 3 .
3. Disconnect the ECL Sensor. See Figure "Engine Coolant Level Sensor Installation for CPC" .
   

   Figure 1. Engine Coolant Level Sensor Installation for CPC

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 "30.3.1.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, go to step 6 .
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 "30.3.1.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, go to step 7 .
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 "30.3.1.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, review steps through 7 . If the results are the same, call the Detroit Diesel Customer Support Center (313–592–5800).

Section 30.3.1.1
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.