Results: The supply voltage is not reaching the sensor. Verify that the original problem is resolved. Repair: Replace the engine coolant level sensor. Results: The supply voltage is reaching the sensor. Check the Supply Voltage at the Sensor Connectorī. Turn the keyswitch to the ON position.Ĭ. Measure the voltage between terminals P800-A (+8 VDC digital sensor supply) and P800-B (Return) at the harness connector for the engine coolant level sensor.ĭ. Turn the keyswitch to the OFF position. Results: The status of the “Coolant Level” is not “OK” when the jumper wire is installed. The ECM, the signal wire, and the return wire are OK. Results: The status of the “Coolant Level” is “OK” when the jumper wire is installed. Short the Harness and Monitor the Status of the “Coolant Level”Ī. Connect Cat ET to the service tool connector.ī. Disconnect the J800/P800 connectors for the engine coolant level sensor.Ĭ. Install a jumper wire between P800-B (Digital Sensor Return) and P800-C (Coolant Level Sensor).ĭ. Turn the keyswitch to the ON position.Į. Monitor the status of “Coolant Level” on Cat ET while the jumper wire is installed.į. Turn the keyswitch to the OFF position. Verify that the original problem is resolved.ģ. Ensure that all of the seals are properly connected. Repair: Repair the wiring and/or the connectors. Results: There is a problem with the connectors and/or the wiring. Results: The connectors and wiring are OK. Refer to Troubleshooting, “Electrical Connectors – Inspect” for the correct torque values. Refer to Troubleshooting, “Electrical Connectors – Inspect” for the correct torque values.Į. Check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, “Electrical Connectors – Inspect”.Ĭ. Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector, the customer connector, and the sensor connector that is associated with the circuit for the engine coolant level sensor.ĭ. Check the allen head screw on each ECM connector for the proper torque. Inspect the J800/P800 connectors for the engine coolant level sensor. Inspect the Electrical Connectors and the WiringĪ. Turn the keyswitch to the OFF position.ī. Thoroughly inspect connectors (1) and (2). Results: The coolant is at the proper level. Purge any air that is trapped in the cooling system. Air may be trapped in the cooling system. Identify the source of the coolant leak and fix the problem. Repair: Add coolant according to the procedure in the Operation and Maintenance Manual. Refer to the engine Operation and Maintenance Manual for the proper procedure. Allow the engine to cool.ī. Check the coolant level. (36) Engine coolant level Table 1 Troubleshooting Test StepsĪ. Stop the engine. J61 and P61 terminals that are associated with the engine coolant level sensor P1 terminals that are associated with the engine coolant level sensor Rear view of a typical radiator with an engine coolant level sensor Schematic of the engine coolant level sensorĮngine components for the engine coolant level sensor If the coolant level is not programmed, Cat ET will display “Unavailable” for the parameter. Verify that the coolant level has been programmed to “Enabled” on the configuration screen on the Cat® Electronic Technician (ET). If the signal is not present, an event code is generated. The Electronic Control Module (ECM) detects the ground on the input for the engine coolant level. When the internal switch closes, the signal for the engine coolant level is grounded through the sensor return. When the sensor is immersed in coolant, an internal switch is closed. The sensor should be immersed in coolant at all times. The engine coolant level sensor is located in the top tank of the radiator. The engine coolant level sensor provides a means of monitoring the engine coolant level in order to warn the operator when the coolant level is low. Use this procedure to troubleshoot any suspect problems with the engine coolant level sensor.
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