Series 60 DDEC V Troubleshooting – Section 24.3 Troubleshooting Flash Code 14, PID 175/FMI 3

Section 24.3
Troubleshooting Flash Code 14, PID 175/FMI 3

This diagnostic condition is typically and open sensor signal or return circuit for the Engine Oil Temperature Sensor.‪

Note: This code will only be logged during warm engine operation.

Section 24.3.1
Code Check

Perform the following steps to check for codes.‪

1. Turn vehicle ignition ON.
2. Plug in diagnostic tool and determine which code is logged.
   1. If codes PID 110/FMI 3 is logged, refer to "24.2.1 Engine Coolant Temperature Sensor Check" .
   2. If codes PID 175/FMI 3 is logged, refer to "24.3.2 Engine Oil Temperature Sensor Check" .

Section 24.3.2
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 and install a jumper between OTS/EOT Sensor connector sockets 1 and 2. See Figure "Engine Oil Temperature Sensor Circuits" .
   

   Figure 1. Engine Oil Temperature Sensor Circuits

3. Turn ignition ON.
4. Read active codes.
   1. If code p 175/4 is logged, refer to "24.3.3 Check for Signal Short to +5 Volt Line" .
   2. If code p 175/3 is logged and any codes except code p 175/4 are logged, refer to "24.3.4 Open Line Check" .

Section 24.3.3
Check for Signal Short to +5 Volt Line

Perform the following steps to check for a short to the +5 volt line.‪

1. Turn vehicle ignition OFF.
2. Remove jumper wire.
3. Disconnect the Engine Harness connector at the ECM/ECU.
4. Measure resistance between sockets E-7 and E-12, E-7 and E-26 on the Engine Harness connector. See Figure "Engine Harness Connector" .
   

   Figure 2. Engine Harness Connector

   1. If the resistance measurement is greater than or equal to 5 Ω, go to step 5 .
   2. If the resistance measurement is less than 5 Ω, the signal line E-7 is shorted to the engine +5 volt line E-12 or E-26. Repair the short and refer to "24.3.4.1 Verify Repairs" .
5. Check terminals at the OTS/EOT Sensor connector (both sensor and harness side) for damage: bent, corroded and unseated pins or sockets. See Figure "Engine Oil Temperature Sensor Circuits" .
   1. If terminals or connectors are damaged, repair them. Refer to "24.3.4.1 Verify Repairs" .
   2. If terminals and connectors are not damaged, replace the OTS/EOT Sensor. Refer to "24.3.4.1 Verify Repairs" .

Section 24.3.4
Open Line Check

Perform the following steps to check for an open line.‪

1. Turn ignition OFF.
2. Disconnect the Engine Harness connector at the ECM/ECU. Leave the jumper wire between A and B of the temperature sensor connector.
3. Measure resistance between sockets E-7 and E-15 on the Engine Harness connector. See Figure "Engine Harness Connector" .
   1. If the resistance measurement is less than or equal to 5 Ω, go to step 4 .
   2. If the resistance measurement is greater than 5 Ω or open, the signal line E-7 or return line E-15 is open. Repair the open. Refer to "24.3.4.1 Verify Repairs" .
4. Check terminals at the ECM/ECU Engine Harness connector (both ECM/ECU and harness side) for damage: bent, corroded and unseated pins or sockets. See Figure "Engine Harness Connector"
   1. Check terminals at the ECM/ECU Engine Harness connector (both ECM/ECU and harness side) for damage: bent, corroded and unseated pins or sockets. See Figure "Engine Harness Connector"
   2. If terminals and connectors are not damaged, replace the temperature sensor.

Section 24.3.4.1
Verify Repairs

Perform the following steps to verify repairs.‪

1. Turn vehicle ignition OFF.
2. Reconnect all connectors.
3. Turn vehicle ignition ON. Clear codes.
4. Start and run the engine for eight minutes. Stop the engine.
5. Check diagnostic tool for codes.
   1. If no codes are logged, troubleshooting is complete.
   2. If code p 110/3 or p 175/3 and any other codes are logged, review this section to find the error. Refer to "24.3.1 Code Check" .
   3. If any codes except code p 110/3 or p 175/3 are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .