MBE 4000 DDEC VI Troubleshooting – Section 19.1 SPN 27/FMI 3

Section 19.1
SPN 27/FMI 3

This diagnostic condition is typically the EGR valve position circuit failed high.‪

Section 19.1.1
EGR Valve Position Circuit Check

Check as follows:‪

1. Disconnect the EGR valve connector.
2. Turn the ignition ON (key ON, engine OFF).
3. Measure the voltage between pin 4 of the EGR connector harness and ground.
   1. If the voltage is present, repair the short to power between pin 4 of the EGR connector harness and pin 60 of the 120–pin MCM connector. Refer to "19.1.1.1 Verify Repairs" .
   2. If there is no voltage present,. go to step 4 .
4. Measure the voltage between pin 3 of the EGR connector harness and ground.
   1. If the voltage is present, repair the short to power between pin 3 of the EGR connector harness and pin 67 of the 120–pin MCM connector. Refer to "19.1.1.1 Verify Repairs" .
   2. If there is no voltage present, go to step 5 .
5. Turn the ignition OFF.
6. Disconnect the MCM 120–pin connector.
7. Measure the resistance from pin 3 of the EGR connector harness and pin 67 of the 120–pin MCM connector.
   1. If the resistance is greater than 2 Ω, repair the open between pin 3 of the EGR connector harness and pin 67 of the 120–pin MCM connector. Refer to "19.1.1.1 Verify Repairs" .
   2. If the resistance is less than 3 Ω, replace the EGR valve. Refer to "19.1.1.1 Verify Repairs" .

Section 19.1.1.1
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.