PLUG AS 2443712 - Caterpillar

Illustration 1 g02627406
Schematic of the "Hydraulic Pump 2 Outlet" Pressure SensorThis diagnostic code is recorded when the Hydraulic Pump ECM reads the sensor signal voltage. The Hydraulic Pump ECM determines that the voltage is too low. The possible causes of this failure are listed below:
The sensor has failed.
The signal circuit in the machine harness is shorted to ground.
The Hydraulic Pump ECM has failed. Note: Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected.Test Step 1. CHECK THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Disconnect the machine harness from the sensor. Expected Result:The diagnostic code changes from CID 2266 FMI 04 to CID 2266 FMI 03. Results:
OK - The diagnostic code changed to CID 2266 FMI 03. This indicates that the failure is no longer present. The sensor has failed.Repair: Replace the sensor.STOP
NOT OK - The diagnostic code CID 2266 FMI 04 remained active. This indicates that the failure remains present. The sensor is not causing the failure. Proceed to test step 2.Test Step 2. CHECK THE HARNESS.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the J2 machine harness connector from the ECM.
At the harness connector for the sensor, measure the resistance between the signal contact C (wire T967-YL) and frame ground. Expected Result:The resistance 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 - The resistance is less than 5000 ohms. The machine harness has failed. There is a short between frame ground and the signal circuit in the machine harness. Repair: For information on testing for short circuits and finding short circuits, refer to Testing and Adjusting, "Wiring Harness (Short Circuit) - Test". 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. 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. Observe that 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 2266 FMI 04 diagnostic code is active.Expected Result:The CID 2266 FMI 04 diagnostic