Coolant Level - Test
Use this procedure to troubleshoot any suspect problems with the circuit for the coolant level sensor.
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| Illustration 1 | g03842332 |
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Schematic for coolant level sensor | |
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| J1939 Code and Description | Default Conditions which Generate this Code | System Response |
|---|---|---|
| 111-01 Low Coolant Level Warning | The coolant level sensor sends a signal to the engine Electronic Control Module (ECM) that indicates a low coolant level. | The code is logged. Also, the diagnostic lamp is illuminated. |
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| Troubleshooting Test Steps | Values | Results |
|---|---|---|
1. Inspect the Electrical Connectors and the Wiring Harness. A. Remove electrical power from the ECM. B. Thoroughly inspect the connector for the atmospheric pressure sensor and the P7 connector. Inspect the ECM connector J2/P2. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details. C. Perform a D. Check the allen head screw on the ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values. |
Electrical connectors and wiring |
Result : The electrical connectors and wiring are OK. Proceed to Test Step 2. Result : The electrical connectors and/or wiring is NOT OK. Repair : Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem. If the problem is not resolved, proceed Test Step 2. |
2. Check the Supply Voltage at the Sensor Connector. A. Disconnect the atmospheric pressure sensor. B. Restore electrical power to the ECM. C. Measure the voltage between terminals (A) and ( B) at the harness connector for the barometric pressure sensor. D. Remove electrical power from the ECM. |
Voltage |
Result : The voltage is OK. Proceed to Test Step 3. Result : The voltage is NOT OK. Proceed to Test Step 6. |
3. Disconnect the Coolant Level Sensor and Monitor the Status of "Coolant Level". A. Connect Cat® Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools". B. Disconnect the connector for the coolant level sensor. C. Restore electrical power to the ECM. D. Monitor the status of "Coolant Level" on Cat ET. |
"Coolant Level" |
Result : The "Coolant Level" status is OK. Proceed to Test Step 4. Result : The "Coolant Level" status is NOT OK. Proceed to Test Step 5. |
4. Short the Harness and Monitor the Status of "Coolant Level". A. Install a jumper wire between terminals (J1) and (J7) on the harness connector for the coolant level sensor. B. Monitor the status of "Coolant Level" on Cat ET while the jumper wire is installed. C. Remove the jumper wire. D. Remove electrical power from the ECM. |
"Coolant Level" |
Result : The "Coolant Level" status is NOT OK. Proceed to Test Step 5. Result : The "Coolant Level" status is OK. Repair : Drain the coolant below the level of the coolant level sensor. Replace the sensor. Fill the cooling system according to the procedure in the Operation and Maintenance Manual. Verify that the problem is resolved. If the problem is not resolved, proceed Test Step 5. |
5. Check the Operation of the ECM. A. Fabricate a jumper wire that is long enough to provide a test circuit across the ECM connector. Crimp the connector sockets to each end of the jumper wire. B. Remove the J1/7 signal wire from the J1 ECM connector. C. Install one end of a jumper wire into the location for the signal wire. Ensure that the jumper wire is isolated from other wires and from engine ground. D. Restore electrical power to the ECM and monitor the status of "Coolant Level" on Cat ET. E. Connect the other end of the jumper wire to engine ground. Monitor the status of "Coolant Level" on Cat ET. |
ECM |
Result : The ECM is OK. Repair : Repair the signal wire between the ECM and the connector for the sensor. Result : The ECM is NOT OK. Repair : Temporarily install a new ECM. Refer to Troubleshooting, "ECM - Replace". If the new ECM works correctly, verify that the problem is resolved. If the problem is not resolved, proceed Test Step 6. |
6. Check the +8 V Supply Voltage at the ECM. A. Disconnect the J2/P2 ECM connector. B. Fabricate a wire jumper that is long enough to be used to measure the supply voltage at the ECM connector. Crimp a connector socket to one end of the wire. C. Remove the wire from terminal location P1-18 (+8 V sensor supply). Install a wire jumper into the socket P1-18. D. Connect the J14/P14 ECM connector. E. Restore electrical power to the engine ECM. F. Measure the voltage between the wire jumper in P1-18 and engine ground. G. Remove electrical power from the ECM. H. Remove the wire jumper and replace all wires. |
Voltage |
Result : The voltage is NOT OK. Repair : Replace the ECM. Refer to Troubleshooting, "ECM - Replace". |
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