GLASS 8Y6828 - Caterpillar

Illustration 1 g02028493
"Hydraulic Pump #2 Outlet Pressure" sensor circuit schematic
This diagnostic code is for the "Hydraulic Pump #2 Outlet Pressure" sensor. An FMI 03 indicates the Machine ECM has determined the voltage of the sensor output signal is above normal. Possible causes of this diagnostic code are listed below:
Failed sensor power supply.
Failed sensor.
Open sensor circuit wire.
Sensor signal output wire shorted to +battery.
The Machine ECM has failed (unlikely).Note: Poor connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all the machine harnesses and connectors involved in the circuit. Make sure to verify that all of the connections in the circuit are clean, secure, and in good condition. Correct any problems found with any of the connections. Verify the diagnostic code CID 2266 FMI 03 is still active, before continuing with this procedure.Note: The following test procedure may create other diagnostic codes. Ignore all the created diagnostic codes now, but clear all those codes after the cause for the original diagnostic code has been corrected. Test Step 1. CHECK SENSOR POWER.
Turn the disconnect switch and the key start switch to the ON position.
Do not disconnect any machine harness connectors at this time.
At the "Hydraulic Pump #2 Outlet Pressure" sensor, measure a DC voltage from contact A (wire 308-YL(Yellow)) to contact B (wire A209-BK(Black)) on the sensor connector. Expected Result:The voltage is equal to system voltage. Results:
YES - The voltage is equal to system voltage. Go to Test Step 2.
NO - The voltage is not equal to system voltage. There is a problem with the machine system voltage. Repair: Refer to the complete Electrical System Schematic of the machine. Investigate and repair the system voltage circuit. After the system voltage supply problem has been repaired, check if the 2266 FMI 03 diagnostic code is still active. If the diagnostic code is still active, go to Test Step 2.Test Step 2. CHECK THE SENSOR, THE ECM, AND THE MACHINE HARNESS.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the "Hydraulic Pump #2 Outlet Pressure" sensor.
In the harness connector for the sensor, place a jumper wire between the contact for terminal 3 (wire T967-YL(Yellow)) and the contact for terminal 2 (wire A209-BK(Black)) in the sensor connector.
Turn the key start switch and the disconnect switch to the ON position.
Observe the status of the CID 2266 FMI 03 diagnostic code. Expected Result:The CID 2266 FMI 03 diagnostic code remains active. Results:
YES - The CID 2266 FMI 03 code remains active. The sensor is not the cause of the problem. Go to Test Step 3.
NO - The CID 2266 FMI 03 diagnostic code is no longer active. The diagnostic code has been replaced by an active CID 2266 with a different FMI code. The sensor has failed. Repair: Replace the sensor.Go to Test Step 5.Test Step 3. CHECK THE SENSOR CIRCUIT FOR AN OPEN WIRE.
Turn the key start switch and the disconnect switch to the OFF position.
The sensor remain disconnected from