ANTENNA AS 3497695 - Caterpillar

Illustration 1 g01078988
Schematic of the Pressure Sensor (Rear Brake Oil)This diagnostic code is associated with the pressure sensor (rear brake oil). The FMI 08 means that the ECM has determined that the signal frequency or the signal pulse width is not within the expected range. The sensor is a PWM sensor that operates at a frequency of approximately 500 hertz. The sensor has an operating duty cycle of 5% to 95%. The possible causes of this diagnostic code are listed below:
The sensor has failed.
Intermittent connections or poor connections
Mechanical devices are loose.
The ECM has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0426 FMI 08 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure. Test Step 1. CHECK FOR POWER AT THE SENSOR.
Do not disconnect the harness connector from the sensor.
At the back of the harness connector for the sensor, insert a multimeter probe along contact A (wire K983-BU) for the voltage supply.
Turn the key start switch and the disconnect switch to the ON position.
Measure the voltage from contact A (wire K983-BU) to contact B (wire J842-BK).Expected Result:The voltage is 8 0.5 DCV.Results:
OK - The voltage is 8 0.5 DCV. Proceed to Test Step 3.
NOT OK - The voltage is not 8 0.5 DCV. The circuit is open. Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT OF THE SENSOR.
Turn the key start switch and the disconnect switch to the OFF position.
At the back of the harness connector for the sensor, remove the multimeter probe from contact A and insert the probe along the signal wire (contact C).
At the back of the harness connector for the sensor, insert the multimeter probe along the ground wire (contact B).
Turn the disconnect switch and the key start switch to the ON position.
Monitor the signal of the sensor with a digital multimeter.
Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through