Series 60 DDEC VI Troubleshooting – Section 40.2 SPN 412/FMI 4

Section 40.2
SPN 412/FMI 4

This diagnosis is typically EGR temperature circuit failed low.‪

Section 40.2.1
Short Circuit Check

Check for a short circuit as follows:‪

1. Disconnect the EGR Temperature Sensor.
2. Disconnect the 120–pin MCM connector.
3. Measure the resistance between pin 1 and 2 of the EGR Temperature Sensor connector.
   1. If the resistance is less than 5 Ω, repair the short between wires 52 and 83 of the 120–pin MCM connector. See Figure "EGR Temperature Sensor" . Refer to "40.2.1.1 Verify Repairs" .
   

   Figure 1. EGR Temperature Sensor

   2. If the resistance is greater than 5 Ω, go to step 4 .
4. Measure the resistance between pin 2of the EGR Temperature Sensor harness connector and ground.
   1. If the resistance is less than 3 Ω, repair the short circuit between pin 2 of the EGR Temperature Sensor harness connector and ground. Refer to "40.2.1.1 Verify Repairs" .
   2. If the resistance is greater than 5 Ω, repeat steps 3 through 4 . If the results are the same, contact the Detroit Diesel Customer Support Center (313–5925044).

Section 40.2.1.1
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.