DD15 Troubleshooting – Section 39.1 SPN 411/FMI 0

Section 39.1
SPN 411/FMI 0

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

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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" .

Section 39.1.1
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.


    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. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.

EPA07 DD15 Troubleshooting Guide - DDC-SVC-MAN-0029
Generated on 10-13-2008

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