ELBOW 0018947 - Caterpillar

Illustration 1 g01322917
Connections of the position sensor for the brake and decelerator pedalThis diagnostic code is associated with the position sensor of the brake and decelerator pedal. 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.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean. Verify that all connections in the circuit are secure. Verify that all connections in the circuit are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.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 2305 FMI 08 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure. System Response:A level 2 warning will be generated. The functionality is lost and maximum machine speed is limited. The ECM will force the machine in neutral interlock and the ECM will restrict any machine movement if the brake pedal switch has an active diagnostic code.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 709-OR) for the voltage supply.
At the back of the harness connector for the sensor, insert a multimeter probe along contact B (wire J764-BR) for the ground.
Turn the key start switch and the disconnect switch to the ON position.
Measure the voltage from contact A (wire 709-OR) to contact B (wire J764-BR).Expected Result:The voltage is 10 0.5 DCV.Results:
OK - The voltage is 10 0.5 DCV. Proceed to Test Step 3.
NOT OK - The voltage is not 10 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. Insert the probe along the signal wire at contact C (wire M730-YL).
The other multimeter probe remains at the ground wire contact B (wire J764-BR).
Turn the disconnect switch and the key start switch to the ON position.
Monitor the signal of the sensor with the multimeter.
Without disconnecting the sensor or the hardware that is associated with the