Series 60 DDEC VI Troubleshooting – Section 40.4 SPN 412/FMI 20

Section 40.4
SPN 412/FMI 20

This diagnosis is typically EGR temperature drift (high box).‪

Section 40.4.1
EGR Temperature Check

Check as follows:‪

1. Visually inspect the EGR cooler for physical damage (broken/stuck butterfly).
   1. If damage is found, repair as necessary. Refer to "40.4.1.1 Verify Repairs" .
   2. If no damage is found, go to step 2 .
2. Disconnect the EGR Valve Temperature Sensor.
3. Inspect the EGR Valve Temperature Sensor connectors for bent, spread or corroded pins.
   1. If pin damage is found, repair as necessary. Refer to "40.4.1.1 Verify Repairs" .
   2. If no pin damage is found, replace the EGR Valve Temperature Sensor. Refer to "40.4.1.1 Verify Repairs" .

Section 40.4.1.1
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.