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Event Codes: Low Coolant Level Shutdown (Error Code: 111)

Coolant Level is Low

Figure 1.1 - Tachometer Electric (Error Code: 111)

Use this procedure to troubleshoot Low Coolant Level or use this procedure if one of the codes is active.
  • E2143 (1) Low Engine Coolant Level - Least Severe (1) - The engine has been running for 60 seconds. The engine coolant level has fallen below the Coolant Level Sensor for the specified delay time. The code is logged.
  • E2143 (2) Low Engine Coolant Level - Moderate Severity (2) - The engine has been running for 60 seconds. The engine coolant level has fallen below the Coolant Level Sensor for the specified delay time. Engine power is derated. The code is logged.
  • E2143 (3) Low Engine Coolant Level - Most Severe (3) - The engine has been running for 60 seconds. The engine coolant level has fallen below the Coolant Level Sensor for the specified delay time. Engine power is derated. The code is logged.
Figure 1.2 - Logged Event Codes (Low Engine Coolant Level)

The engine Coolant Level Sensor provides a means of monitoring the engine coolant level in order to warn the operator in the event that the coolant level is low. The engine Coolant Level Sensor is usually located in the top tank of the radiator. The sensor should be immersed in coolant at all times.

When the sensor is immersed in coolant, an internal switch is closed. When the internal switch closes, the signal for the engine coolant level is grounded through the sensor return. The Electronic Control Module (ECM) detects the grounded signal on the input for the engine coolant level. If the signal is not present, an event code is generated.

#Troubleshooting Test Steps
1). Check for Low Coolant Level. If Not OK - Fill the coolant tank to the proper level if necessary.
2). Check the Cooling System for leaks. If Not OK - Repair any leaks immediately.
3). Check for air in the Cooling System.
4). Check for the correct mixture of Antifreeze and Water.
5). Check for a faulty Coolant Level Sensor.
→If an electrical problem with the Coolant Level Sensor is suspected, refer to Coolant Level - Test for information that is related to troubleshooting an electrical problem with the Coolant Level Sensor.

#Coolant Level - Test
Use this procedure to troubleshoot any suspect problems with the circuit for the Coolant Level Sensor. The Coolant Level Sensor monitors the engine coolant level in order to warn the operator when the coolant level is low.
Figure 1.3 - Low Coolant Level (Status Flags)

1). Check the Coolant Level.
→There may be a leak in the Cooling System. Identify the source of the coolant leak. Repair the leak.
2). Verify that the Coolant Level Sensor parameter is programmed correctly.
A. Connect CAT ET to the service tool connector, and establish communication with the ECM. Read More: How to Connecting Caterpillar ET Software to the ECM.
B. Verify that the Coolant Level Sensor parameter is programmed to Installed (Configuration Tool).
Figure 1.4 - Coolant Level Sensor (Installed)
3). Check the supply voltage at the sensor connector.
A. Disconnect the Coolant Level Sensor at the sensor connector.
B. Measure the voltage between terminals A (sensor supply) and B (sensor return) at the harness connector for the Coolant Level Sensor. The voltage measurement is 8.0 ± 0.5 VDC (OK).
4). Short the signal wire to ground and monitor the Status for Coolant Level. Read More: Status Tool on Caterpillar ET Software.
A. Fabricate a jumper wire that is long enough to create a short circuit between two terminals at the Coolant Level Sensor harness connector. Crimp connector pins to each end of the jumper wire.
Figure 1.5 - Coolant Level (Low)
B. Install the jumper wire between terminals B (sensor return) and C (sensor signal) on the harness side of the connector for the Coolant Level Sensor.
C. Monitor the status of Coolant Level on Cat ET while the jumper wire is installed. Wait at least 30 seconds for activation of the status indicator.
→If the status changes from "Low" to "OK" when the jumper wire is installed. The ECM and the wiring harness to the Coolant Level Sensor are OK. Replace the Coolant Level Sensor with CAT P/N: 239-9957.
Figure 1.6 - Coolant Level (OK)
→If the status does not change from "Low" to "OK" when the jumper wire is installed. The problem is between the ECM and the sensor connector. Repair the wiring. Verify that the repair eliminates the problem.

#Trip points for the Monitoring System
The Monitoring System determines the level of action that is taken by the Electronic Control Module (ECM) in response to a condition that can damage the engine. When any of these conditions occur, the appropriate event code will trip.
Figure 1.7 - Low Coolant Level (Monitoring System)


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