NUMBER: 08 DDEC VI–5 S.M. REF.: 91 ENGINE: EPA07 MBE 4000 SUBJECT: SPN 2631/FMI 1 PUBLICATION: DDC-SVC-MAN-0010 (6SE568) SPN 2631/FMI 1 Low Air Flow has been added. DATE: March 2008 SPN 2631/FMI 1 This diagnosis is typically Low Air Flow. Check as follows: 1. Turn the ignition ON. 2. Check EGR Control Valve Operation. Command PWM1 to 50% while monitoring EGR Actual Position. Does EGR Actual Position read between 47-54%? [a] Yes, go to step 3. [b] No, go to step 4. 3. Command PWM1 to 90% while monitoring EGR Actual Position. Does EGR Actual Position read between 87-94%? [a] Yes, go to step 8. [b] No, go to step 4. 4. Turn the ignition OFF. 5. Disconnect EGR Control Valve Harness connector. 6. Inspect connector for damaged, corroded or spread pins. [a] If damage is found, repair as necessary. [b] If no damaged pins are found, go to step 7. 7. Remove the EGR Control Valve; inspect valve for heavy soot or coolant contamination. [a] If contamination is found, repair root cause as necessary. [b] If no contamination is found, replace the EGR Control Valve. Verify repairs. 8. Check Intake Manifold Pressure Sensor; obtain local barometric pressure for your area. Compare Intake Manifold pressure to barometric pressure. Is the Intake manifold pressure within 0.06 psi of barometric pressure? [a] Yes, go to step 9. [b] No, replace the Intake Manifold Pressure sensor. 9. Start the engine. 10. Using DDDL AMA service routine, perform a forced air mass adaptation. Does the air mass adaptation successfully complete? [a] Yes, go to step 11. [b] No, go to step 12. 11. Check VPOD for correct part number, proper air supply installation, and configuration (PWM 10 needs to be configured). Is the VPOD installed and configured correctly? [a] Yes, go to step 12. [b] No, correct VPOD installation and/or configuration. 12. Remove and inspect the Inlet Air Delta P Sensor including the Systek Sensor, look for damaged O-rings or plugged orifices. [a] If damage is found; repair as necessary. [b] If no damage is found, go to step 13. 13. Perform CAC inspection and leak test. Refer to OEM literature for procedure. [a] If inspection and/or leak test fail, repair as necessary. [b] If CAC inspection passes, go to step 14. 14. If above steps do not indicate any issues, obtain DDDL log file of failure and contact the Detroit Diesel Customer Support Center (313–592–5800). ADDITIONAL SERVICE INFORMATION Additional service information is available in one of the DDEC VI troubleshooting guides. Detroit Diesel®, DDC®, Series 60® and the spinning arrows design are registered trademarks of Detroit Diesel Corporation. © Copyright 2008 Detroit Diesel Corporation. All rights reserved. Printed in U.S.A.