Description
ISSUE
Errors in the EGR system may result in one or more of the following codes:
• SPN 2791/FMI 2 – EGR Valve Actuator, Position Deviation Error
• SPN 2791/FMI 11 – EGR Valve Actuator, Motor Off
• SPN 2791/FMI 16- EGR Valve Actuator, Learn Cycle Too Large
• SPN 520296/FMI 31 – EGR Valve Actuator Learn Cycle Incomplete
• SPN 2659/FMI 0 – EGR Flow Target Error Diagnostic – High Flow
• SPN 2659/FMI 1 – EGR Flow Target Error Diagnostic – Low Flow
CAUSE
Incorrect, missing, or loose parts in the EGR system can cause the above fault codes.
REQUIRED ACTION
Follow all published troubleshooting in Power Service Literature in the EPA07/10/GHG14 DDEC VI/10/13 Electronics and Troubleshooting Manual (DDC-SVC-MAN-0084). Note that some EGR system fault codes are covered in Advanced Diagnostics as shown in Technical Service letter 11 TS-3.
1. Carefully inspect the EGR valve system hardware consisting of the EGR valve actuator, lever, pull rod, and EGR valve for incorrect, missing, damaged, or loose parts. The lever on top of the EGR valve actuator is dependent on engine model and type. See Figures 1 and 2 for information on how to correctly identify the lever. Note the numbers stamped on the lever.
2. Inspect the pull rod connecting the lever to the EGR valve. The hardware should be firmly tightened with no slack, and there should be no binding in movement. The pull rod has a “v” stamped on it at the EGR valve end, and an “s” stamped on it at the EGR valve actuator end. The DD15AT (472906) has an additional spacer at the EGR valve end that must also be correctly installed. The spacer is used on the connecting bolt between the top of the pull rod ball socket and the bottom of the EGR valve circular lever. Omission of the spacer can result in binding of the EGR valve during actuation. The EGR pull rod lever design is different on DD13, DD15TC, and DD16 engines and a spacer is not used on those applications. See Figures 3-6 for examples of the various configurations.
REQUIRED MATERIAL
If any parts need replacing, Table 1 provides a list of the correct part numbers for the major
components. Part numbers are subject to change without notice.
REPAIR PROCEDURE
If any repairs are needed, repair information on the EGR system components can be found in
the EPA07/10/GHG14 Exhaust – EGR – ATS Manual (DDC-SVCMAN-0083).
Note that if the EGR valve actuator is being replaced, it must be fully installed onto the engine with all necessary hardware attached before the ignition is turned on for the first time in the valve actuator’s life. This is because the valve actuator does a “slow learn” the first time it’s powered up to correctly learn the end stops as it fully cycles. Subsequent ignition sequences only have a “quick learn”. If the valve actuator is not correctly installed, the initial “slow learn” will be incorrect. This can be corrected by running the “EGR Actuator Slow Learn” procedure in DiagnosticLink®. Choose “EGR Actuator Slow Learn” from the Actions » EGR menu to display the EGR Actuator Slow Learn dialog box.
CLAIM PROCESS
Normal in-warranty procedures apply. Proactive removal of properly functioning EGR system parts is not allowed under warranty.
CONTACT INFORMATION
Please contact the DetroitTM Customer Support Center at 800-445-1980 or email csc@daimler.com if you have any questions.
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