Section 39.2
SPN 411/FMI 3

This diagnosis is typically EGR Delta P Sensor circuit failed high.‪

Section 39.2.1
Open Circuit Check

Check as follows:‪

1. Disconnect the EGR Delta P Sensor.
2. Measure the resistance across pins 1 and 3 of the EGR Delta P Sensor.
   1. If the resistance is greater than 130 kΩ, replace the EGR Delta P Sensor. Refer to "39.2.1.1 Verify Repairs" .
   2. If the resistance is less than 130 kΩ, go to step 3 .
3. Measure the resistance between pins 1 and 2 of the EGR Delta P Sensor.
   1. If the resistance is greater than 130 kΩ, replace the EGR Delta P Sensor. Refer to "39.2.1.1 Verify Repairs" .
   2. If the resistance is less than 130 kΩ,, go to step 4 .
4. Turn the ignition ON (key ON, engine OFF).
5. Measure the voltage between pins 1 and 2 of the EGR Delta P Sensor harness connector.
   1. If the voltage is between 4.5 and 5.5 volts, go to step 7 .
   2. If the voltage is less than 4.5 volts, go to step 6 .
6. Measure the voltage between pin 1 of the EGR Delta P Sensor harness connector and ground.
   1. If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin 2 of the EGR Delta P Sensor harness connector and pin 103 of the 120–pin MCM connector. See Figure "EGR Delta P Sensor" . Refer to "39.2.1.1 Verify Repairs" .
   

   Figure 1. EGR Delta P Sensor

   2. If the voltage is less than 4.5 volts, repair the open circuit between pin 1 of the EGR Delta P Sensor harness connector and pin 117 of the 120–pin MCM connector. Refer to "39.2.1.1 Verify Repairs" .
7. Turn the ignition OFF.
8. Disconnect the 120–pin MCM connector.
9. Measure the resistance between pins 1 and 3 of the EGR Delta P Sensor harness connector.
   1. If the resistance is less than 5 Ω, repair the short in wires between pins 1 and 3 of the EGR Delta P Sensor harness connector and pins 117 and 109 of the 120–pin MCM connector. Refer to "39.3.1.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, go to step 10 .
10. Measure the resistance across pins 2 and 3 of the EGR Delta P Sensor harness connector.
    1. If the resistance is less than 5 Ω, repair the short in wires between pins 109 and 103 of the 120–pin MCM connector. Refer to "39.3.1.1 Verify Repairs"
    2. If the resistance is greater than 5 Ω, go to step 11 .
11. Measure the resistance between pin 1of the EGR Delta P Sensor harness connector and ground.
    1. If the resistance is less than 5 Ω, repair the short circuit between pin 117 of the 120–pin MCM connector and ground. Refer to "39.3.1.1 Verify Repairs" .
    2. If the resistance is greater than 5 Ω, go to step 12 .
12. Measure the resistance between pin 3 of the EGR Delta P Sensor harness connector and ground..
    1. If the resistance is less than 5 Ω, repair the short between pin 109 of the 120–pin MCM connector and ground. Refer to "39.2.1.1 Verify Repairs" .
    2. If the resistance is greater than 5 Ω, repair the open circuit between pin 3 of the EGR Delta P Sensor harness connector and pin 109 of the 120–pin MCM connector. Refer to "39.2.1.1 Verify Repairs" .

Section 39.2.1.1
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.