Series 60 DDEC VI Troubleshooting – Section 87.5 SPN 1636/FMI 31

Section 87.5
SPN 1636/FMI 31

This diagnosis is typically the difference between intake manifold temperature dand EGR temperature is less than threshold (low box).‪

Section 87.5.1
Temperature Difference Check

Check as follows:‪

1. Inspect the entire air intake system including the CAC for leaks, cracks or plugging.
   1. If damage is found, repair as necessary. Refer to "87.5.1.1 Verify Repairs" .
   2. If no damage is found, go to step 2 .
2. Disconnect the Intake Manifold Temperature Sensor.
3. Inspect the Intake Manifold Temperature Sensor connectors for bent, spread or corroded pins.
   1. If pin damage is found, repair as necessary. Refer to "87.5.1.1 Verify Repairs" .
   2. If no pin damage is found, replace the Intake Manifold Temperature Sensor. Refer to "87.5.1.1 Verify Repairs" .

Section 87.5.1.1
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.