DD15 SPN 2791/FMI 16 Troubleshooting

SPN 2791/FMI 16

This fault typically arises from operating under extreme load and high ambient temperatures and/or high altitude operation.‪

Check as follows:‪

  1. Check for multiple codes:
    1. If SPN 110/FMI 0 is also present, repair the cooling system first. Refer to “97.10.1 Verify Repairs” .
    2. If only SPN 2791/FMI 15 is present, go to the next step.
  2. Visually inspect for signs of exhaust leak in the area of the actuator.
    1. If exhaust leaks are present, repair as necessary. Refer to “97.10.1 Verify Repairs” .
    2. If no exhaust leaks are present, go to the next step.
  3. Remove and inspect the actuator cooler lines and fittings.
    1. If coolant lines or fittings are kinked or plugged, repair/replace the damaged component. Refer to “97.10.1 Verify Repairs” .
    2. If coolant lines are not damaged and problem still persists, contact the Detroit Diesel Customer Support Center at 313–592–5800.

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.
    To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪
  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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