DD15 SPN 111/FMI 3 Troubleshooting

SPN 111/FMI 3

This condition is typically a circuit failed high.‪

Check as follows:‪

1. Check for multiple codes.
   1. If other faults are active in addition to fault 111/3, troubleshoot the other faults first.
   2. If only fault 111/3 is active, go to the next step.
2. Disconnect the ECL Sensor.
3. Measure the resistance between pin 1 and 2 of the ECL Sensor.
   1. If the resistance is greater than 600 kΩ (submerged) or open, replace ECL sensor. Refer to “28.2.1 Verify Repairs” .
   2. If the resistance is less than 600 kΩ, go to the next step.
4. Turn the ignition ON (key On, engine OFF).
5. Measure the voltage between pins 1 and 2 of the ECL Sensor harness connector.
   1. If the voltage is greater than 2.75 volts, go to step 7 .
   2. If the voltage is less than 2.75 volts, go to the next step.
6. Measure the voltage between pin 1 of the ECL Sensor harness connector and ground.
   1. If the voltage is greater than 2.75 volts, repair the open between pin 2 of the CPC #3 connector and the ECL Sensor harness. Refer to “28.2.1 Verify Repairs” .
   2. If the voltage is less than 2.75 volts, repair the open between pin 11 of the CPC #3 connector and the ECL Sensor harness. Refer to “28.2.1 Verify Repairs” .
7. Disconnect the CPC #3 connector.
8. Measure the resistance between pins 1 and 2 of the ECL Sensor harness connector.
   1. If the resistance is less than 5 Ω, repair the short between the ECL Sensor harness connector pins 1 and 2 and pins 2 and 11 of the CPC #3 connector. Refer to “28.2.1 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).