Section 93.4
SPN 2791/FMI 7

This diagnosis is typically the EGR valve is in an incorrect position.‪

Section 93.4.1
EGR Valve Position Check

Check as follows:‪

1. Turn the ignition ON (key ON, engine OFF).
2. Using DDDL 7.0, monitor the EGR actual position while activating active PWM1 to 50% for 15 seconds.
3. Is the EGR actual position reading between 42% and 58%?
   1. If yes, go to step 6 .
   2. If no, go to step 4 .
4. Remove the EGR valve.
5. Inspect the EGR valve butterfly for signs of excessive soot or white residue.
   1. If white residue is found, repair the cause/source of coolant contamination and possible EGR cooler failure. Also replace the EGR valve. Refer to "93.4.1.1 Verify Repairs" .
   2. If excessive soot residue is found, correct the cause of soot contamination and any possible CAC system leaks. Repair the source of soot contamination and replace the EGR valve. Refer to "93.4.1.1 Verify Repairs" .
   3. If no contamination is found, replace the EGR valve. Refer to "93.4.1.1 Verify Repairs" .
6. Disconnect the EGR valve connector.
7. Inspect the connector for bent, spread or corroded pins.
   1. If connector damage is found, repair as necessary. Refer to "93.4.1.1 Verify Repairs" .
   2. If no damage is found, contact the Detroit Diesel Customer Support Center at 313–592–5800 for further assistance.

Section 93.4.1.1
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.