HARNESS AS-SENSOR 2510193 - Caterpillar

Illustration 1 g01257751
5 volt power supply connectionsThe 5 volt power supply supplies the power for the main pump pressure sensor that is equipped on machines that have the electronic hydraulic implement system.This diagnostic code is recorded when the ECM reads the voltage of the sensor supply circuit and the voltage is below normal.The following causes could signal this diagnostic code:
A sensor has failed.
The sensor supply circuit is shorted to frame ground or a -battery circuit.
The ECM has failed. This is unlikely.Test Step 1. CHECK THE SENSOR
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the main pump pressure sensor from the machine harness.
After disconnecting the sensor, check to see if the CID 0262 FMI 04 code is still active.Expected Result:The diagnostic code is not active.Results:
OK - The diagnostic code is not active. The harness circuit is correct. The sensor that was just disconnected has failed.Repair: Replace the sensor.STOP
NOT OK - The diagnostic code is still active. The machine harness is may be shorted to ground. Proceed to Test Step 2.Test Step 2. CHECK FOR A SHORT TO GROUND
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At the harness connector for the ECM, measure the resistance between frame ground and contact J1-11 (wire T997-OR). Measure the resistance between contact J1-11 (wire T997-OR) and all of the other contacts that are used in the J1 and J2 connectors for the ECM. Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to Test Step 3.
NOT OK - One or more of the resistance measurements is less than 5000 ohms. The machine harness has failed.Repair: The T997-OR wire is shorted in the machine harness. Refer to the complete Electrical System Schematic for your machine. Check all harness connectors that are in the power supply circuit. Ensure that the connectors are clean and secure. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the harness connectors and clean the contacts of the harness connectors and check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the sensor circuit.
Reconnect all harness connectors. Make sure that the connectors are fully seated and the clips for each connector are completely fastened.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 0262 FMI 04 diagnostic code is active.Expected Result:The CID 0262 FMI 04 diagnostic code is active.Results:
YES - The CID 0262 FMI 04 diagnostic code is active. The problem has not been corrected. Repair: Check the circuit again. Use the Caterpillar Electronic Technician (ET) service tool, if available, in order to perform a "Wiggle Test" on the machine wiring harness. The wiggle test can