This condition is typically a circuit failed high.
30.2.1
Open Circuit Check
Check as follows:
1. Check for multiple codes.
[a] If other faults are active in addition to fault 111/3, troubleshoot the other faults first.
[b] If only fault 111/3 is active, go to step 2.
2. Disconnect the ECL Sensor.
3. Measure the resistance between pin 1 and 2 of the ECL Sensor.
[a] If the resistance is greater than 600 kΩ (submerged) or open, replace ECL sensor.
See Figure 30-3. Refer to section 30.2.1.1.
[b] If the resistance is less than 600 kΩ, go to step 4.
4. Turn the ignition ON (key On, engine OFF).
5. Measure the voltage between pins 1 and 2 of the ECL Sensor harness connector.
[a] If the voltage is greater than 2.75 volts, go to step 7.
[b] If the voltage is less than 2.75 volts, go to step 6.
6. Measure the voltage between pin 1 of the ECL Sensor harness connector and ground.
[a] 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 section 30.2.1.1.
[b] 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 section 30.2.1.1.
7. Disconnect the CPC #3 connector.
8. Measure the resistance between pins 1 and 2 of the ECL Sensor harness connector.
[a] 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 section 30.2.1.1.
[b] If the resistance is greater than 5 Ω, review steps 3 through 8. If the results are the same, call the Detroit Diesel Customer Support Center (313–592–5800).
