MBE 900 DDEC VI Troubleshooting – Section 115.1 SPN 3512/FMI 3

Section 115.1
SPN 3512/FMI 3

This diagnosis typically the 3 V sensor supply bank 1 circuit failed high‪

Section 115.1.1
Short to Power Check

This fault indicates that the MCM detects a short to power (voltage > 3.2) on any of the MCM pins listed in Table "MCM Pins for Short to Power Check" .‪

Component‪	MCM Pin‪
Fuel Temperature Sensor, Engine Coolant Temperature Sensor‪	55‪
Fuel Temperature Sensor‪	77‪
Charge Air Cooler Outlet Pressure Sensor‪	102‪
Engine Oil Temperature/Pressure Sensor‪	108‪
Engine Coolant Temperature Sensor‪	110‪

Inspect the harness and repair as necessary. Refer to "115.1.1.1 Verify Repairs" .‪

Section 115.1.1.1
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.