DD15 SPN 1172/FMI 2 Troubleshooting

SPN 1172/FMI 2

This code is typically a coolant temperature/compressor inlet temperature plausibility error.‪

Check as follows:‪

1. Disconnect the Turbo Compressor Inlet Temperature Sensor.
2. Inspect the Turbo Compressor Inlet Temperature Sensor connectors for bent, damaged or corroded pins.
   1. If damaged pins are found, repair as necessary. Refer to “82.1.1 Verify Repairs” .
   2. If no damage is found, replace the Turbo Compressor Inlet Temperature Sensor. Refer to “82.1.1 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.
   

   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.