DD15 Troubleshooting – Section 28.1 SPN 111/FMI 1

Section 28.1
SPN 111/FMI 1

This diagnosis typically coolant level low.‪

Check as follows:‪

1. Turn the vehicle ignition switch ON (key On, engine OFF).
2. Check for multiple codes.
   1. If other faults are active in addition to fault 111/1, troubleshoot the other faults first.
   2. If only fault 111/1 is active, go to the next step.
3. Check the coolant level in the reservoir.
   1. If the coolant level in the reservoir is not within limit, go to the next step.
   2. If the coolant level in the reservoir is within limit, replace the sensor. refer to "28.1.1 Verify Repairs" .
   
4. Check for coolant leak at cylinder head gasket.
5. Check for coolant leak at air compressor head gasket.
6. Check for external coolant leak at hose connections.
7. Check for coolant in oil.
8. Check for loose or faulty radiator cap.
9. When these checks and subsequent repairs are finished, refer to "28.1.1 Verify Repairs" .

Section 28.1.1
Verify Repairs

Check 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.

   ENGINE EXHAUST ‪
   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. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.