Series 60 DDEC V Troubleshooting – Section 25.3 Troubleshooting Flash Code 15, PID 175/FMI 4

Section 25.3
Troubleshooting Flash Code 15, PID 175/FMI 4

The diagnosis for this PID is oil temperature circuit low.‪

Section 25.3.1
Engine Oil Temperature Sensor Check

Perform the following steps to check the Engine Oil Temperature Sensor (OTS/EOT Sensor).‪

1. Turn vehicle ignition OFF.
2. Disconnect OTS/EOT Sensor connector. See Figure "Engine Oil Temperature Sensor" .
   

   Figure 1. Engine Oil Temperature Sensor

3. Start and run the engine for eight minutes.
4. Read active codes with engine running.
   1. If code p 175/4 is logged, refer to "25.3.2 Check for Short " .
   2. If any codes except code p 175/4 are logged, go to step 5 .
5. Check terminals at the OTS/EOT Sensor connector (both sensor and harness side) for damage: bent, corroded and unseated pins or sockets.
   1. If terminals or connectors are damaged, repair them. refer to "25.3.2.1 Verify Repairs" .
   2. If terminals and connectors are not damaged, replace the OTS/EOT Sensor. Refer to "25.3.2.1 Verify Repairs" .

Section 25.3.2
Check for Short

Perform the following steps to check for a short.‪

1. Turn ignition OFF.
2. Disconnect the engine harness connector at the ECM/ECM/ECU.
3. Measure resistance between sockets E-7 and E-15 on the Engine Harness connector. See Figure "ECM/ECM/ECU Engine Harness Connector" .
   

   Figure 2. ECM/ECM/ECU Engine Harness Connector

4. Measure resistance between socket E-7 and a good ground.
   1. If the resistance measurement between sockets E-7 and E-15, or E-7 and battery (-) is less than or equal to 5 Ω, the signal line E-7 is shorted to the return line E-15 or battery ground. Repair the short. Refer to "25.3.2.1 Verify Repairs" .
   2. If the resistance measurement between socket E-7 and E-15 is greater than 5 Ω or open, and the resistance measurement between socket E-7 and a good ground is greater than or equal to 5 Ω or open, go to step 5 .
5. Check terminals at the ECM/ECU engine harness connector (both ECM/ECU and harness side) for damage: bent, corroded and unseated pins or sockets. Check terminals E-7 and E-15 of the ECM/ECU connector. See Figure "ECM/ECM/ECU Engine Harness Connector" .
   1. If terminals or connectors are damaged, repair them. Refer to "25.3.2.1 Verify Repairs" .
   2. If terminals and connectors are not damaged, reprogram the ECM/ECU. Contact Detroit Diesel Customer Support Center (313-592-5800).

Section 25.3.2.1
Verify Repairs

Perform the following steps to verify repairs.‪

1. Turn vehicle ignition OFF and reconnect all connectors.
2. Turn vehicle ignition ON and clear codes.
3. Start and run the engine for one minute.
4. Stop the engine and check the diagnostic tool for codes.
   1. If no codes are logged, troubleshooting is complete.
   2. If code p 175/4 and any other codes are logged, review this section to find the error. Refer to "25.3.1 Engine Oil Temperature Sensor Check" .
   3. If any codes except code p 110/4 or p 175/4 are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .