MBE 4000 DDEC VI Troubleshooting – Section 73.1 SPN 715/FMI 5

Section 73.1
SPN 715/FMI 5

This diagnosis is typically the Electrostatic Oil Separator circuit failed open.‪

Section 73.1.1
Open Circuit Check

Check as follows:‪

1. Check for multiple codes.
   1. If 715/5 and 27/3 are present, go to step 11 .
   2. If only 715/5 is present, go to the next step.
2. Disconnect the Electrostatic Oil Separator.
3. Turn the ignition ON (key ON, engine OFF).
4. Measure the voltage between pins 1 and 2 of the Electrostatic Oil Separator harness connector.
   1. If the voltage is between 6 and 8 volts, go to step 8 .
   2. If voltage is greater than 10.5 volts, repair the short to power between pin 2 of the Electrostatic Oil Separator harness connector and pin 39 of the MCM 120–pin connector. Refer to "73.1.1.1 Verify Repairs" .
   3. If there is no voltage, go to the next step.
5. Turn OFF the ignition.
6. Disconnect the MCM 120–pin connector.
7. Measure the resistance between pin 2 of the Electrostatic Oil Separator harness connector and pin 39 of the MCM 120–pin connector.
   1. If the resistance is less than 3Ω, replace the MCM.
   2. If the resistance is greater than 3Ω, repair the open between pin 2 of the Electrostatic Oil Separator harness connector and pin 39 of the MCM 120–pin connector. Refer to "73.1.1.1 Verify Repairs" .
8. Turn OFF the ignition.
9. Disconnect the MCM 120–pin connector.
10. Measure the resistance between pin 3 of the Electrostatic Oil Separator harness connector and ground.
    1. If the resistance is less than 5Ω, replace the Electrostatic Oil Separator. The replacement procedure may be found in the EPA07 MBE 4000 Service Manual (6SE420), refer to 6.5.
    2. If the resistance is greater than 5Ω, repair the open between pin 3 of the Electrostatic Oil Separator harness connector and pin 107 of the MCM 120–pin connector. Refer to "73.1.1.1 Verify Repairs" .
11. Measure the voltage between pin 1 of the Electrostatic Oil Separator harness connector and ground.
    1. If voltage is present, repair the short to power between pin 1 of the Electrostatic Oil Separator harness connector and pin 67 of the MCM 120–pin connector. Refer to "73.1.1.1 Verify Repairs" .
    2. If no voltage is present, go to the next step.
12. Turn OFF the ignition.
13. Disconnect the MCM 120–pin connector.
14. Measure the resistance between pin 1 of the Electrostatic Oil Separator harness connector and pin 67 of the MCM 120–pin connector.
    1. If the resistance is less than 5Ω, replace the Electrostatic Oil Separator. The replacement procedure may be found in the EPA07 MBE 4000 Service Manual (6SE420), refer to 6.5.
    2. If the resistance is greater than 5Ω, repair the open between pin 1 of the Electrostatic Oil Separator harness connector and pin 67 of the MCM 120–pin connector. Refer to "73.1.1.1 Verify Repairs" .

Section 73.1.1.1
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.