BEARING 9L8072 - Caterpillar

This test procedure is only applicable on applications that have a coolant level sensor installed.Use this procedure to troubleshoot any suspect faults with the circuit for the coolant level sensor.The coolant level sensor monitors the engine coolant level to warn the operator when the coolant level is low.When the probe is not immersed in coolant, a voltage is sent to the sensor signal wire. When this condition is detected by the Electronic Control Module (ECM), an event code is activated.If applicable and prior to troubleshooting any faults with the coolant level sensor, use the electronic service tool to check the installation status for the sensor. The coolant level sensor configuration parameter must be set to "Installed" in order for the ECM to monitor the signal from the sensor. Not all applications have the parameter available.The activation of an event code and/or a warning lamp is probably caused by a low coolant level. The other possible cause is a fault in the wiring harness, a connector, or the sensor.During the following procedure, refer to the electrical schematic for the application.Complete the procedure in the order in which the steps are listed.
Table 1
Troubleshooting Test Steps Values Results
1. Check the Coolant Level
A. Remove electrical power from the ECM.
B. Check the coolant level. Refer to the Operation and Maintenance Manual for the correct procedure to check the coolant level.
Coolant level
Result: The coolant level is low.
Repair: Add coolant according to the procedure in the Operation and Maintenance Manual.
There may be a leak in the cooling system. Identify the source of the coolant leak. Repair the leak. Refer to Systems Operation/Testing and Adjusting, "Cooling System" for additional information.
Result: The coolant is at the correct level.
For applications that have a "Coolant Level Sensor" parameter, proceed to Test Step 2.
For applications that do not have a "Coolant Level Sensor" parameter, proceed to Test Step 3.
2. Verify that the "Coolant Level Sensor" Parameter is Programmed Correctly
This Test Step is only applicable to applications that have a "Coolant Level Sensor" parameter.
A. Connect the electronic service tool to the diagnostic connector.
B. Establish communication with the ECM.
C. Verify that the "Coolant Level Sensor" parameter is programmed to "Installed".
D. Remove electrical power from the ECM.
Parameter programmed
Result: The "Coolant Level Sensor" parameter is not programmed correctly.
Repair: Program the "Coolant Level Sensor" parameter to "Installed".
Verify that the repair eliminates the fault.
Result: The "Coolant Level Sensor" parameter is programmed correctly.
Proceed to Test Step 3.
3. Check the Supply Voltage at the Sensor Connector
A. Disconnect the coolant level sensor at the sensor connector.
B. Restore electrical power to the ECM.
C. Measure the voltage between terminals A (sensor supply) and B (sensor return) at the harness connector for the coolant level sensor.
D. Remove electrical power from the ECM.
8.0 0.5 VDC
Result: The voltage measurement is not correct for the application.
Repair: The sensor