This diagnosis is typically EGR differential pressure failed high (High Box).
39.1.1
EGR Delta P Sensor Check
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.
[a] If connector damage is found, repair as necessary. Refer to section 39.1.1.1.
[b] If no damage is found, go to step 3.
3. Remove the EGR Delta P Sensor.
4. Inspect the sensor tubes for plugging.
[a] If no EGR tube obstructions are found, replace the EGR Delta P Sensor.
Refer to section 39.1.1.1.
[b] If EGR tube obstructions are found clean or replace tubes as necessary.
Refer to section 39.1.1.1.
39.1.1.1
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.
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.
