SWASHPLATE 2426802 - Caterpillar

MID 87 - Chassis ECMCID 379 - Machine Auto Lube Pressure SensorFMI 4 - Voltage Below Normal
Illustration 1 g02445118
Machine "Auto Lube" pressure sensor circuit
This diagnostic code indicates that the "Chassis ECM" detects the machine "Auto Lube" pressure sensor voltage is below normal.The following can cause this code:
Sensor failure
Signal circuit shorted to ground
ECM failureNote: The following test procedure may create other diagnostic codes. Ignore these created codes and clear these created codes after the original diagnostic code has been corrected. Ensure diagnostic code CID 379 FMI 4 is active before performing this procedure.Note: Use a calibrated digital multimeter for this procedure.Test Step 1. INSPECT THE SENSOR
Perform a visual inspection of the sensor, sensor wiring, and sensor hardware.Expected Result:There is no apparent damage to the sensor, wiring, or hardware.Results:
OK - There is no apparent damage to the sensor, wiring, or hardware. Proceed to Test Step 3.
NOT OK - There is no apparent damage to the sensor, wiring, or hardware.Repair: Replace the damaged part.Proceed to Test Step 2.Test Step 2. CHECK THE ADJUSTMENT AND/OR THE CALIBRATION OF THE SENSOR
Turn on the disconnect switch and the key switch.
Perform a sensor calibration.
Check CID 379 FMI 4 status.Expected Result:CID 379 FMI 4 is not active.Results:
OK - CID 379 FMI 4 is not active.Repair: The adjustment and/or the calibration has corrected the failure. Resume normal operation.STOP
NOT OK - CID 0379 FMI 04 is active. Proceed to Test Step 3.Test Step 3. CHECK POWER AT THE SENSORDo not disconnect the harness from the sensor.
At the back of the harness connector for the sensor, insert a multimeter probe along voltage supply contact A (wire 113-OR(Orange)).
Turn on the disconnect switch and the key switch.
Measure the voltage from contact A (wire 113-OR(Orange)) to contact B (wire J879-GN(Green)).Expected Result:Battery voltageNote: The sensor voltage is rated at 24 6 VDC.Results:
OK - Battery voltage is seen. Proceed to Test Step 4.
NOT OK - Battery voltage is not seen. The circuit is open. The sensor fuse or the harness may have failed.Repair: Check the fuse for the sensor. Replace the fuse if the fuse has no continuity. If the fuse is good, check all the harness contacts in the circuit for the power to the sensor. Repair or replace the harnessSTOPTest Step 4. CHECK THE SENSOR SIGNAL
Turn off the disconnect switch and the key switch.
The multimeter probe remains along contact B (wire J879-GN(Green)).
At the back of the harness connector for the sensor, insert the other multimeter probe along contact C (wire E456-WH(White)).
Turn on the disconnect switch and the key switch.
Monitor the sensor signal with a digital multimeter.Expected Result:The sensor signal is 5000 Hz 1000 Hz.Results:
OK - The sensor signal is 5000 Hz 1000 Hz. Proceed to Test Step 5.
NOT OK - The sensor signal is not 5000 Hz 1000 Hz. The sensor has failed.Repair: Replace the sensorSTOPTest Step 5. CHECK FOR A HARNESS SHORTThe key switch and the disconnect switch remain in the off position.
Disconnect the harness from the sensor and the ECM.
At the harness connector for the ECM, measure