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

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%?
[a] If yes, go to step 6.
[b] 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.
[a] If white residue is found, repair the cause/source of coolant contamination and
possible EGR cooler failure. Also replace the EGR valve. Refer to section
[b] 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 section
[c] If no contamination is found, replace the EGR valve. Refer to section
6. Disconnect the EGR valve connector.
7. Inspect the connector for bent, spread or corroded pins.
[a] If connector damage is found, repair as necessary. Refer to section
[b] If no damage is found, contact the Detroit Diesel Customer Support Center at
313–592–5800 for further assistance. 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.

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