COLLAR 0957035 - Caterpillar

Illustration 1 g01622804
Schematic of the "Alternator R-Terminal"
The signal of the "Alternator R-Terminal" is used to detect the machine in operation. If the input continually receives a voltage signal that is above normal, the machine operation cannot be detected. The hours that are reported on the service meter would be inaccurate.Test Step 1. Check The Harness Cable Of The "R-Terminal" For Short To Battery.
Disconnect the harness cable from the Advisor module.
Measure the resistance from the "Alternator R-terminal" input (403-GN(Green)) to the + battery contact 1. Expected Result:The resistance measurement is greater than 5000 ohms.Results:
OK - The resistance measurement is greater than 5000 ohms. The harness is correct. Proceed to Test Step 2.
NOT OK - There is a short to the battery in the harness cable.Repair: Repair the cable and verify that the fault has been removed.STOPTest Step 2. CHECK THE HARNESS FOR A SHORT TO A VOLTAGE SOURCE.
Disconnect the harness cable from the Advisor module.
Start the engine.
Measure the "Alternator R-Terminal" input 7 to verify there is an 11 VDC to 32 VDC square wave from 0 kHz to 2 kHz or verify there is steady DC voltage present that is equivalent to the battery voltage. Expected Result:The "Alternator R-Terminal" input is not steady DC voltage that is equivalent to the voltage of the battery.Results:
OK - The signal is an 11 VDC to 32 VDC square wave from 0 kHz to 2 kHz or a steady DC voltage that is equivalent to the battery voltage. The harness is not faulty. Proceed to Test Step 3.
NOT OK - There is a short in the harness to a DC voltage source other than battery voltage.Repair: Repair the cable and verify that the fault has been removed.STOPTest Step 3. CHECK THE ALTERNATOR OF THE MACHINE
Disconnect the machine harness from the alternator.
Start the engine.
Measure the "Alternator R-Terminal" to verify there is an 11 VDC to 32 VDC square wave from 0 kHz to 2 kHz. There should not be a steady DC voltage present that is equivalent to the battery voltage. Expected Result:The measurement at "Alternator R-Terminal" is an 11 VDC to 32 VDC square wave from 0 kHz to 2 kHz.Results:
OK - The "Alternator R-Terminal" is an 11 VDC to 32 VDC square wave from 0 kHz to 2 kHz. Proceed to Test Step 4.
NOT OK - The "Alternator R-Terminal" is not an 11 VDC to 32 VDC square wave from 0 kHz to 2 kHz.Repair: Repair the alternator or replace the alternator.STOPTest Step 4. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
Clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the key start switch to the ON position and operate the machine.
Determine if the CID 1251 FMI 03 diagnostic code is present by using Caterpillar Electronic Technician (ET). Expected Result:A CID 1251 FMI 03 diagnostic code is present.Results:
YES - The CID 1251 FMI 03 diagnostic code is present. The problem has not been corrected. The Advisor module may have failed.Repair: Exit this procedure and perform the diagnostic code procedure again. If the