This diagnosis is typically EGR temperature circuit failed low.
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.
[a] If the resistance is less than 5 Ω, repair the short between wires 52 and 83 of the
120–pin MCM connector. See Figure 40-1. Refer to section 40.2.1.1.
[b] 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.
[a] 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 section 40.2.1.1.
[b] 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).
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.
