MBE 900 DDEC VI Troubleshooting – Section 111.1 SPN 3509/FMI 3

Section 111.1
SPN 3509/FMI 3

This diagnosis typically the 5 V sensor supply bank 1 circuit failed high.‪

Section 111.1.1
Short to Power Check

This fault indicates that the MCM detects a short to power (voltage > 5.3) on any of the MCM pins listed in Table "MCM Pins for Short to Power Check" .‪

Component‪	MCM Pin‪
Charge Air Cooler Outlet Pressure Sensor‪	58‪
Charge Air Cooler Outlet Pressure Sensor‪	102‪
Inlet Air Delta P, Intake Throttle Valve‪	103‪
Inlet Air Delta P, Intake Throttle Valve‪	117‪

Inspect the harness and repair as necessary. Refer to "111.1.1.1 Verify Repairs" .‪

Section 111.1.1.1
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.