HARNESS AS-PLATFORM 2647095 - Caterpillar

Illustration 1 g02203734
Schematic of the "Autolube Pressure" sensorThis diagnostic code is associated with the "Autolube Pressure" sensor. The FMI 08 diagnostic code means that the ECM has determined that signal frequency or the signal pulse width is not within the expected range. 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. A failure of the Chassis ECM 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 0379 FMI 08 is active before performing this procedure.Note: Use a digital multimeter for the measurements in this procedure.Test Step 1. 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, insert the multimeter 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 the digital multimeter.Expected Result:The signal from the sensor is approximately 5000 Hz 1000 Hz.Results:
OK - The signal from the sensor responds correctly. The sensor is operating correctly. Proceed to Test Step 2.
NOT OK - The signal from the sensor does not respond correctly. The sensor is NOT operating correctly.Repair: Replace the sensor.STOPTest Step 2. CHECK THE SIGNAL CIRCUIT FOR A SHORT IN THE HARNESS.
The key start switch and the disconnect switch remain in the OFF position.
Disconnect the machine harness connectors from the sensor and the ECM.
Measure the resistance between contact J2-51 (wire E456-WH) and all contacts that are used in the machine harness connectors for the ECM.Expected Result:The resistance is greater than 5000 ohms.Results:
OK - The resistance is greater than 5000 ohms. The circuit is correct. Proceed to Test Step 3.
NOT OK - The resistance is less than 5 ohms. The signal circuit is shorted to another circuit in the harness.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.
Inspect the harness connectors. Clean the contacts of the harness connectors. Check the wires for damage to the insulation that is caused by excessive heat, battery acid, or chafing.
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit.
Reconnect all harness connectors in order to make sure that the connectors are fully seated. Also, make sure that the clips for each connector are fastened securely.
Turn the disconnect switch and the key start switch to the ON position.
Operate the machine.
Determine if the CID 0379 FMI 08 diagnostic code is active.Expected Result:The CID 0379 FMI 08 diagnostic code is active.Results:
YES - The CID 0379 FMI 08 diagnostic code is active. The problem has not been corrected.Repair: Check the circuit again.