MBE 4000 DDEC VI Troubleshooting – Section 92.3 SPN 1636/FMI 4

Section 92.3
SPN 1636/FMI 4

A typical diagnosis is Intake Manifold Pressure/Temp Sensor Open Short to Ground.‪

Section 92.3.1
Intake Air Manifold Pressure/Temp Sensor Circuit Failed Low

Perform the following steps to troubleshoot an Intake Air Manifold Pressure/Temp Sensor Circuit Failed Low fault:‪

Figure 1. Intake Air Temperature Sensor

Repair short to ground between pin 2 of the Intake Air Temperature Sensor and pin 106 of the MCM 120-pin connector.‪

Section 92.3.1.1
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.