This fault is typically a circuit failed low.
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.
[a] If other faults are active in addition to fault 111/4, troubleshoot the other faults first.
[b] If only fault 111/4 is active, go to step 3.
3. Disconnect the ECL Sensor. See Figure 30-4.
4. Disconnect the CPC #3 connector (21-pin).
5. Measure the resistance across pins 1 and 2 of the ECL Sensor connector.
[a] If the resistance is less than 5 Ω, repair the short between the wires 2 and 11 of the
CPC #3 connector. Refer to section 30.3.1.1.
[b] 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.
[a] 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 section 30.3.1.1.
[b] 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.
[a] 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 section 30.3.1.1.
[b] If the resistance is greater than 5 Ω, review steps 30.3.1.1 through 7. If the results are
the same, call the Detroit Diesel Customer Support Center (313–592–5800).
