DISC-BRAKE 4458762 - Caterpillar

Thoroughly inspect connectors (1) and (2). Also, thoroughly inspect all of the other connectors that are in the circuit. Refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01207582
Terminal locations at the P1 ECM connector (P1-5) Digital return (P1-66) Throttle signal
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector and the engine interface connector.
Check the allen head screw on each ECM connector and the engine interface connector for the proper torque. refer to the diagnostic functional test Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins, and sockets are coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the connectors or wiring and/or replace the connectors or wiring.STOPTest Step 2. Check the Supply Voltage to the Speed Control
Restore electrical power to the ECM.
Measure the voltage between terminal 15 (+Battery) and terminal 16 (−Battery) on the speed control.
Remove electrical power from the ECM.Expected Result:The voltage is 24 3 V.Results:
OK - The voltage is 24 3 V. The voltage supply to the speed control is correct. Proceed to Test Step 3.
Not OK - The voltage is not 24 3 V.Repair: There is a problem in a harness or a connector between the batteries and the speed control. The problem is in the circuit breaker or the batteries.Perform the following procedure:
Check the voltage between engine ground and the following test points. If voltage is not present at a test point, the problem is in the device, wire, or connector that precedes the point in the circuit. Refer to Illustration 1 as a reference.
Table 2
Device    Test location    
Battery     +Battery terminal    
Auxiliary breaker     Input terminal    
Output terminal
Engine interface connector     Terminal 4    
Measure the voltage between the +Battery terminal of the battery and the following test points. If voltage is not present at a test point, the problem is in the device or the circuit that precedes the point in the circuit. Refer to Illustration 1 as a reference.
Table 3
Device    Test location    
Battery disconnect switch     Input terminal    
Output terminal
Engine interface connector     Terminal 39    Repair the circuit or replace the device that is causing the problem.If a problem with the batteries is suspected, refer to Operating Manual, SEHS9249 and Special Instruction, SEHS7633 for information related to testing the batteries.STOPTest Step 3. Check the Status for the Throttle Position on Caterpillar Electronic Technician (ET)
Connect Cat ET to the service tool connector. Observe the status parameter for the throttle position on Cat ET.
Restore electrical power to the ECM.
Turn the speed adjust potentiometer to the lowest setting.
Adjust the speed adjust potentiometer from the lowest setting to the highest setting. Monitor the