HOUSING A 0010091 - Caterpillar

Illustration 1 g01227716
Blade control handle raise/lower (Y-axis) position sensor connectionsThis diagnostic code is associated with the implement control handle position sensor (Y-axis) for the up and down blade commands to the ECM.The FMI 04 diagnostic code is recorded when the ECM reads the voltage of the PWM signal from the Y-axis (raise/lower) position sensor as being below normal. The position sensor is a PWM sensor that operates at a frequency of approximately 500 hertz. The sensor has an operating duty cycle of 3.5% to 96.5%.The possible causes of this diagnostic code are listed:
The sensor signal circuit is shorted to ground.
The sensor has failed.
The ECM has failed. This is unlikely.System Response:The diagnostic code will cause the blade control handle to stop functioning. The implements will be disabled while the diagnostic code is active.Note: Ensure that the CID 1078 FMI 04 is active. This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. When the procedure is completed, clear the created diagnostic codes.Test Step 1. CHECK THE SENSOR
Turn the disconnect switch and the key start switch to the ON position.
Ensure that the diagnostic code is active.
Observe the status of the diagnostic code. Then, disconnect the sensor from the machine harness.Expected Result:The diagnostic code will remain active if the sensor is not the cause of the diagnostic code. The sensor is the cause of the diagnostic code if the diagnostic code is NO longer active.Results:
OK - The diagnostic code remains active. The sensor is not faulty. The machine harness may have failed or the ECM may have failed. Proceed to Test Step 2.
NOT OK - The diagnostic code is NO longer active. The machine harness and the ECM are operating properly. Repair: The sensor has failed. Replace the sensor. Verify that the new sensor corrects the problem.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND
The sensor remains disconnected from the machine harness.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the J1 and J2 machine harness connector from the ECM.
At the J2 machine harness connector, measure the resistance from contact J2-25 wire (H710-PK) to frame ground. Measure the resistance from contact J2-25 wire (H710-PK) to all of the other contacts that are used in the ECM connectors.Expected Result:Each resistance measurement is greater than 5000 ohms.Results:
OK - Each resistance measurement is greater than 5000 ohms. The harness is correct. Proceed to Test Step 3.
NOT OK - one or more of the resistance measurements is less than 5000 ohms.Repair: The machine harness has failed. There is a short in the machine harness between the signal circuit and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE STATUS OF THE DIAGNOSTIC CODE
Inspect the contacts and clean the contacts of the any harness connectors that are disconnected.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Enter service mode of the Caterpillar Monitoring System and clear all inactive