DD15 SPN 3512/FMI 3 Troubleshooting

SPN 3512/FMI 3

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

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
Table 1. MCM Pins for Short to Power Check

Inspect the harness and repair as necessary. Refer to “114.1.1 Verify Repairs” .‪

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.

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