DD15 Troubleshooting – Section 35.2 SPN 175/FMI 4

Section 35.2
SPN 175/FMI 4

This diagnosis is typically oil temperature circuit failed low.‪

Check as follows:‪

1. Disconnect the EOT Sensor.
2. Disconnect the 120–pin connector at the MCM.
3. Measure the resistance across pins 1 and 2 of the EOT Sensor harness connector.
   1. If resistance is greater than 5 Ω, go to the next step.
   2. If resistance is less than 5 Ω, repair short to ground between pins 55 and 108 of the 120-pin MCM connector.Refer to "35.2.1 Verify Repairs" .
4. Measure the resistance between pin 2 of the EOT Sensor harness connector and ground.
   1. If resistance is greater than 5 Ω, repeat the previous steps. If the results are the same, call the Detroit Diesel Customer Support Center (313–592–5800).
   2. If resistance is less than 5 Ω, repair the short circuit between pin 2 of the EOT Sensor harness connector and ground. Refer to "35.2.1 Verify Repairs" .

Section 35.2.1
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.