MBE 4000 DDEC VI Troubleshooting – Section 96.1 SPN 2630/FMI 3

Section 96.1
SPN 2630/FMI 3

This diagnosis is typically Intake Manifold Temperature circuit failed high.‪

Section 96.1.1
Intake Manifold Temperature Circuit Failed High

Check as follows:‪

1. Disconnect the Intake Manifold Pressure/Temperature Sensor.
2. Turn the ignition ON.
   

   Figure 1. Intake Manifold Pressure/Temperature Sensor

3. Measure the voltage between pins 3 and 4 of the Intake Manifold Pressure/Temperature Sensor harness connector.
   1. If the voltage is between 2.75 and 3 volts replace the Intake Manifold Pressure/Temperature Sensor.
   2. If the voltage is less than 2.75 volts, go to step 4 .
4. Measure the voltage between pin 3 of the Intake Manifold Pressure/Temperature Sensor harness connector and ground.
   1. If the voltage is between 2.75 and 3 volts repair open between pin 4 of the Intake Manifold Pressure/Temperature Sensor harness connector and pin 102 of the MCM 120-pin connector.
   2. If the voltage is less than 2.75 volts, repair open between pin 3 of the Intake Manifold Pressure/Temperature Sensor harness connector and pin 119 of the MCM 120-pin connector.

Section 96.1.1.1
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.