DDEC III/IV Single ECM Troubleshooting – Section 13.3 Troubleshooting Flash Code 13

Section 13.3
Troubleshooting Flash Code 13

The following procedure will troubleshoot Flash Code 13, p 111/4: ‪

Section 13.3.1
Sensor Check

Perform the following steps to check the sensor.‪

1. Turn vehicle ignition OFF.
2. Disconnect Coolant Level Sensor (CLS).
3. Turn ignition ON.
4. Start engine.
5. Read logged codes.
6. Stop engine.
   1. If code p 111/3 is logged, refer to "13.3.2 Check Coolant Level Sensor Connector" .
   2. If code p 111/4 is logged, refer to "13.3.3 Check for Short" .

Section 13.3.2
Check Coolant Level Sensor Connector

Perform the following steps to check the CLS connector.‪

1. Inspect terminals at the CLS connector for bent, corroded and unseated pins or sockets. Ensure wires are not reversed at the CLS. See Figure "Coolant Level Sensor and Circuits" .
   1. If terminals and connectors are damaged, repair both. Refer to "13.3.4 Verify Repairs" .
   2. If terminals and connectors are not damaged, replace the CLS. Refer to "13.3.4 Verify Repairs" .
   

   Figure 1. Coolant Level Sensor and Circuits

Section 13.3.3
Check for Short

Perform the following steps to check for a short.‪

1. Turn ignition OFF.
2. Disconnect the vehicle harness connector at the ECM.
3. Measure resistance between sockets A and B on the CLS harness connector. Also measure resistance between socket A and battery ground; and socket A and chassis ground. See Figure "Coolant Level Sensor and Circuits" .
   1. If the resistance is greater than 10,000 Ω or open, refer to "13.3.2 Check Coolant Level Sensor Connector" .
   2. If the resistance is less than or equal to 10,000 Ω, the signal wire (#115) is shorted to the ground (#953), or to chassis ground. Repair short; refer to "13.3.4 Verify Repairs" .

Section 13.3.4
Verify Repairs

Perform the following steps to verify repairs.‪

1. Turn ignition OFF.
2. Reconnect all connectors.
3. Turn ignition ON.
4. Clear DDR codes.
5. Start and run the engine for one minute.
6. Stop engine.
7. Check DDR for codes.
   1. If no codes are displayed, troubleshooting is complete.
   2. If code 111/4 is not logged, and other codes are logged, refer to "9.1 First Step for Diagnosing a Fault Within the DDEC System" .
   3. If code 111/4 is logged, refer to "13.3.5 Code 111/4 Logged" .

Section 13.3.5
Code 111/4 Logged

Perform the following steps to troubleshoot Code 111/4.‪

1. Remove CLS.
2. Plug opening.
3. Locate sensor probe in clean water.
4. Start and run the engine for one minute.
5. Check DDR for codes.
   1. If code 111/4 is logged, all system diagnostics are complete. Review this section to find the error. Refer to "13.3.1 Sensor Check" .
   2. If code 111/4 is not logged, reprogram the ECM and replace the coolant with new. Repeat the test. Refer to "13.3.4 Verify Repairs" .