Series 60 DDEC V Troubleshooting – Section 25.2 Troubleshooting Flash Code 15, PID 110/FMI 4

Section 25.2
Troubleshooting Flash Code 15, PID 110/FMI 4

The diagnosis for this PID is coolant temperature circuit low.‪

The following procedure will troubleshoot Flash Code 15, p 110/4.‪

Section 25.2.1
Coolant Temperature Sensor Check

Perform the following steps to check the Engine Coolant Temperature Sensor (CTS/ECT Sensor).‪

1. Turn vehicle ignition OFF.
2. Disconnect (unplug) CTS/ECT Sensor connector. See Figure "Engine Coolant Temperature Sensor Circuits" .
   

   Figure 1. Engine Coolant Temperature Sensor Circuits

3. Start and run the engine for eight minutes.
4. Read active codes with engine still running.
   1. If code p 110/4 or any other codes are logged, go to step 5 .
   2. If any codes except code p 110/4 are logged, refer to "25.2.2 Check for Short " .
5. Check terminals at the CTS/ECT Sensor connector (both sensor and harness side) for damage; bent, corroded and unseated pins or sockets. See Figure "Engine Coolant Temperature Sensor Circuits" .
   1. If terminals and connectors are in good condition, replace the CTS/ECT Sensor. Refer to "25.2.2.1 Verify Repairs" .
   2. If the terminals and connectors are damaged, repair them. Refer to "25.2.2.1 Verify Repairs" .

Section 25.2.2
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-5 and E-15 on the Engine Harness connector. See Figure "ECM/ECM/ECU Engine Harness Connector" .
4. Measure resistance between socket E-5 and a good ground.
   1. If the resistance measurement between sockets E-5 and E-15, or E-5 and battery ground, is less than or equal to 5 Ω, the signal line E-5 is shorted to the return line E-15 or battery ground. Repair the short. Refer to "25.2.2.1 Verify Repairs" .
   2. If the resistance measurement between sockets E-5 and E-15 is greater than 5 Ω or open, and the resistance measurement between sockets E-5 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-5 and E-15 of the ECM/ECU connector.
   1. If terminals or connectors are damaged, repair them. Refer to "25.2.2.1 Verify Repairs" .
   2. If terminals and connectors are not damaged, reprogram the ECM/ECU. Refer to "25.2.2.1 Verify Repairs" .
   

   Figure 2. ECM/ECM/ECU Engine Harness Connector

Section 25.2.2.1
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. Stop the engine.
4. Check diagnostic tool for codes.
   1. If no codes are logged, troubleshooting is complete.
   2. If code p 110 or p 175/4 and any other codes are logged, review this section to find the error. Refer to "25.2.1 Coolant Temperature Sensor Check" .
   3. If any codes except code p 110 or p 175/4 are logged, refer to "18.3 First Step for Diagnosing a Fault Within the DDEC System" .