SENDER AS-FUEL LEVEL 2592899 - Caterpillar

This procedure is for an alert indicator that is FLASHING all the time. The always FLASHING condition is most likely caused by an undesired open circuit, a short to +battery, a faulty switch, or a faulty EMS control (unlikely).Test Step 1. Check Alert Indicator Switch
Locate the switch that corresponds to the indicator that is always FLASHING. If necessary, use the Electrical System Schematic to help in locating the switch.
Remove the signal circuit from the switch.
Touch the signal circuit to the switch ground circuit. If a switch ground wire is not present, touch the signal circuit to frame ground.
Turn the disconnect and key start switches to the ON position.Expected Result:The alert indicator is OFF.Results:
OK - The switch is faulty.Repair: Check or replace the switch.STOP
NOT OK - The machine harness is open or the EMS control is faulty. Go To Test Step 2.Test Step 2. CHECK EMS CONTROL AND HARNESS
At the machine harness connection for the switch, measure the voltage (DCV) between the signal circuit and the ground circuit.Note: EMS controls with part numbers 3T-1321 and 3T-3136 should measure 10.0 DCV 0.5 DCV instead of 8.0 DCV 0.5 DCV.Expected Result:Voltage is 8.0 DCV 0.5 DCV.Results:
OK - Harness is correct. The EMS control is faulty.Repair: Replace the EMS control. See EMS Control Replacement.STOP
NOT OK - EMS control or harness is faulty. Go to Test Step 3.Test Step 3. CHECK HARNESS GROUND CIRCUIT
The switch remains disconnected. Turn the disconnect and key start switch to the OFF position.
Disconnect the machine harness from the EMS control.
At the machine harness connection for the switch, measure the resistance between the ground circuit and frame ground.Expected Result:Resistance is greater than 5.0 ohms.Results:
OK - The ground circuit in the harness is faulty. There is an open circuit between the ground circuit and frame ground.Repair: Repair or replace the machine harness.STOP
NOT OK - Harness resistance is correct. Go to Test Step 4.Test Step 4. CHECK FOR SHORTED HARNESS
The switch and the EMS control remain disconnected from the machine harness. The disconnect and key start switch remain OFF. At the machine harness for the EMS control, measure the resistance between the signal circuit and +battery (contact 1).Expected Result:Resistance is less than 5000 ohms.Results:
OK - The machine harness is faulty. There is a short between the +battery circuit and the signal circuit in the machine harness.Repair: Repair or replace the machine harness.STOP
NOT OK. - Go to Test Step 5.Test Step 5. CHECK FOR OPEN HARNESS
The switch and the EMS control remain disconnected from the machine harness. The disconnect and key start switch remain OFF. On the Electrical System Schematic, trace the signal circuit from the switch to the EMS control.
Determine the signal contact (connector contact) of the machine harness at the EMS control.
Measure the resistance of the signal circuit from the EMS machine harness connector to the machine harness connection for the switch.Expected Result:Resistance is less than 5.0 ohms.Results:
OK - The EMS control is faulty.Repair: Replace the EMS control. See EMS Control Replacement.STOP
NOT OK - The