REGULATOR-WATER TEMPERATURE 1983427 - Caterpillar

Action Alarm Sounds (Beeps)
Before you troubleshoot the machine be sure that a fault exists. For the correct operation of the action alarm, see the Topic "Warning Operation" in the Systems Operation section of this module. If an alert indicator is ON for a function that also activates the action alarm, then troubleshoot that particular function first.STEP 1 - CHECK THE INPUTS.Turn the key start switch to the OFF position. Disconnect the harness connectors from the machine monitor. This step will check all of the inputs that are related to the activation of the action alarm. See Tables 1 and 2.Start the engine. Measure the resistance from frame ground to each harness connector contact that is related to the action alarm.Check the contacts A1, A2, A5, A9, A10, A11, A12, B1, B2, and B3.At this time, DO NOT check the input for the Machine Performance Panel (MPP). This input is at contact A3.When the machine is running and operating normally, the resistance of each connector contact should measure more than 50 ê.
Resistance is greater than 50 ê for all contacts that were checked: The inputs are operating correctly. Proceed to STEP 2.
Resistance is less than 50 ê: The harness or the related switch is faulty. Turn the key start switch to the OFF position. Troubleshoot the circuit with the low resistance. The switch or the harness must be repaired or replaced. STEP 2 - CHECK THE OPERATION OF THE MPP.Turn the key start switch to the OFF position. Reconnect the machine harnesses to the machine monitor. Put the machine back into the mode of the original fault. (The alarm sounds continuously.) Disconnect the harness connector from the machine performance panel (MPP). If the MPP is the cause the alarm should now stop sounding.
The action alarm still SOUNDS: Wire 410-WH is shorted or the machine monitor is faulty. Check wire 410-WH for a short to ground in the machine harness. If the harness is okay, replace the machine monitor.
The action alarm no longer SOUNDS: The machine performance panel (MPP) is faulty. Check the operation of the MPP. Refer to the service module Machine Performance Panel, SENR5273.Action Alarm (Very Faint Sound)
A Distinct Faint Sound - If the sound is a distinct beep but the sound is faint, then the most likely cause is a switch/sender circuit. The switch/sender could be incorrectly wired or the switch/sender could have an internal failure.The fault must be present or active during the troubleshooting process.STEP 1 - CHECK THE SWITCH/SENDER CIRCUITS.The machine monitoring system uses a hydraulic oil temperature switch/sender and a coolant temperature switch/sender. The circuit for the switch/senders is the most likely cause of this fault.Turn the key start switch to the ON position. Be sure that the fault is present. Listen for the sound of the action alarm. You should hear a distinct faint "beep". One at a time, disconnect the two switch/senders from the machine harness.
If the fault remains, proceed to STEP 2.
If the fault is no longer present, troubleshoot the switch/sender