DD15 SPN 411/FMI 0 Troubleshooting

SPN 411/FMI 0

This diagnosis is typically EGR differential pressure failed high (Low Box).‪

Check as follows:‪

1. Disconnect the EGR Delta P Sensor.
2. Inspect the EGR Delta P Sensor harness connector for bent, spread or corroded pins.
   1. If connector damage is found, repair as necessary. Refer to “39.1.1 Verify Repairs” .
   2. If no damage is found, go to the next step.
3. Check EGR function to ensure it closes (key OFF).
4. Remove the EGR Delta P Sensor.
5. Inspect the sensor tubes for plugging.
   1. If no EGR tube obstructions are found, replace the EGR Delta P Sensor. Refer to “39.1.1 Verify Repairs” .
   2. If EGR tube obstructions are found clean or replace tubes as necessary. Refer to “39.1.1 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.