DD15 SPN 2659/FMI 1 Troubleshooting

SPN 2659/FMI 1

The code is typically an EGR flow target error (low flow).‪

Check as follows:‪

1. Inspect the EGR delivery pipe for external leaks.
   1. If leaks are found, repair as necessary. Refer to “96.2.1 Verify Repairs” .
   2. If no leaks are found, go to the next step.
2. Inspect the Delta P pressure tubes for damage or plugging.
   1. If damage or plugging is found, repair as necessary. Refer to “96.2.1 Verify Repairs” .
   2. If no damage is found, go to the next step.
3. Remove the EGR Delta P Sensor and inspect the O-rings for damage.
   1. If the O-rings are damaged, repair as necessary. Refer to “96.2.1 Verify Repairs” ..
   2. If no damage is found, go to the next step.
4. Inspect the EGR valve for physical damage (broken butterfly).
   1. If the EGR valve is damaged, replace the EGR valve. Refer to “96.2.1 Verify Repairs” ..
   2. If no damage is found, replace the EGR Delta P Sensor. Refer to “96.2.1 Verify Repairs” .

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.
   

   ENGINE EXHAUST ‪
   To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

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.