DD15 Troubleshooting – Section 82.3 SPN 1172/FMI 4

Section 82.3
SPN 1172/FMI 4

This code is typically sensor or circuit failed low.‪

Check as follows:‪

1. Turn the ignition OFF.
2. Disconnect the TCI Sensor.
3. Disconnect the 120–pin MCM connector.
4. Measure resistance between pin 1 and pin 2 of the TCI Sensor Harness connector.
   1. If the resistance is less than 3 Ω, repair the short between pin 1 and pin 2 of the TCI Sensor Harness connector and pin86 and pin 88 of the 120–pin MCM connector. Refer to "82.3.1 Verify Repairs" .
   2. If the resistance is greater than 3 Ω, repair the short to ground between pin 2 of the TCI Sensor and pin 86 of the 120–pin MCM connector. Refer to "82.3.1 Verify Repairs" .

Section 82.3.1
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.

   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.