HOLDER 9K9272 - Caterpillar

Illustration 1 g02434818
Schematic of the Lift Cylinder Rod End Pressure Sensor
Illustration 2 g02428679
(1) Lift Cylinder Rod End Pressure Sensor This diagnostic code is recorded when the Implement ECM determines that the signal from the Lift Cylinder Rod End Pressure Sensor is incorrect.The possible causes of this diagnostic code are listed:
The signal circuit is open.
The +battery circuit from the electrical system to the sensor is open.
The signal circuit is shorted to the +battery circuit.
The signal circuit is shorted to ground.System Response:The machine response is listed:
The Autodig System will not load the bucket.Note: Ensure that the diagnostic code is active.Test Step 1. CHECK THE VOLTAGE FROM THE SIGNAL CIRCUIT
Turn the key start switch to the OFF position.
Disconnect the machine harness from the pressure sensor.
Turn the key start switch to the ON position.
At the harness connector for the pressure sensor, measure the voltage between contact 2 (wire X719-OR(Orange)) and contact 3 (wire E416-PU(Purple)). Expected Result:The voltage is 8 .8 VDC.Results:
YES - The voltage is 8 .8 VDC. The voltage is correct. Proceed to Test Step 5.
NO - The voltage is not 8 .8 VDC. The voltage is not correct. Proceed to Test Step 2.Test Step 2. CHECK THE +BATTERY VOLTAGE
Ensure that the key start switch is in the ON position.
At the harness connector for the sensor, measure the voltage between contact 1 (wire A105-OR(Orange)) and contact 2 (wire X719-OR(Orange)). Expected Result:The voltage is between 18 VDC and 24 VDC.Results:
YES - The voltage is between 18 VDC and 24 VDC. The voltage is correct. Proceed to Test Step 3.
NO - The voltage is less than 18 VDC. The voltage is not correct. There may be an open or a short in the machine harness.Repair: Repair the harness or replace the harness.STOPTest Step 3. CHECK FOR AN OPEN IN THE SIGNAL CIRCUIT
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the connector for the ECM.
The machine harness from the pressure sensor remains disconnected.
Measure the resistance between contact 3 (wire E416-PU(Purple)) at the connector for the pressure sensor and contact J2-50 at the connector for the ECM. Expected Result:The resistance should measure less than 5 Ohms.Results:
YES - The resistance is less than 5 Ohms. The resistance is correct. Proceed to Test Step 4.
NO - The resistance is greater than 5 Ohms. The resistance is not correct.Repair: Repair the harness or replace the harness.STOPTest Step 4. CHECK FOR A SHORT IN THE SIGNAL CIRCUIT
The disconnect switch and the key start switch remain in the OFF position.
At the connector for the ECM, measure the resistance between contact J2-50 (wire E416-PU(Purple)) and the other contacts that are in the connector for the ECM. Expected Result:The resistance is greater than 5000 Ohms.Results:
YES - The resistance is greater than 5000 Ohms. The resistance is correct. Proceed to Test Step 5.
NO - The resistance is less than 5000 Ohms. The resistance is not correct. There is probably a short in the signal circuit for the machine harness.Repair: Repair the harness or replace the harness.STOPTest