ENGINE AR-COMPLETE 3076951 - Caterpillar

Illustration 1 g01805634
Schematic of the "Pump 2 Pressure" sensorThis diagnostic code is associated with the "Pump 2 Pressure" sensor. This diagnostic code is recorded when the Machine ECM reads the sensor signal voltage and 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 machine ECM has failed. Note: The Machine ECM is equipped with LED indicators that serve as a self-diagnostic check. With the key start switch ON, the following can be determined by the ECM indicator lights:
If all of the LED lights are Off, voltage is not being supplied to the Machine ECM. Check for power to the ECM.
If the yellow LED is Flashing, a communication error exists on the "CAN" data-link circuit.
If the yellow LED is constantly On, the Machine ECM software may be missing / not loaded.
If the red LED is Flashing, the Machine ECM has failed and may need replacement. Test Step 1. CHECK THE SENSOR.
Disconnect the machine harness from the sensor. Expected Result:The diagnostic code changes from a CID 2266 FMI 04 diagnostic code to a CID 2266 FMI 03 diagnostic code. 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 J1 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. The Machine ECM may have failed. Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this diagnostic code procedure again. If the failure is not found, replace the ECM. See the Testing and Adjusting, "Electronic Control Module (ECM) - Replace" section of this manual. STOP
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: Repair the machine harness or replace the machine harness. STOP