MBE 4000 DDEC VI Troubleshooting – Section 96.2 SPN 2630/FMI 4

Section 96.2
SPN 2630/FMI 4

This diagnosis is typically Intake Manifold Temperature circuit failed low.‪

Section 96.2.1
Intake Manifold Temperature Circuit Failed Low

Check as follows:‪

1. Disconnect the Intake Manifold Pressure/Temperature Sensor.
2. Disconnect the MCM 120-pin connector.
   

   Figure 1. Intake Manifold Pressure/Temperature Sensor

3. Measure the resistance between pin 3 of the Intake Manifold Pressure/Temperature Sensor and ground.
   1. If the resistance is less than 3 Ω, repair short to ground between pin 3 of the Intake Manifold Pressure/Temperature Sensor and pin 119 of the MCM 120-pin connector.
   2. If the resistance is greater than 3 Ω, replace the Intake Manifold Pressure/Temperature Sensor.

Section 96.2.1.1
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.