FACE-EXTRUDER 1985346 - Caterpillar

MID 087 - Chassis ECMCID 0075 - Steering Oil Temperature SensorFMI 04 - Voltage Below Normal
Illustration 1 g01819553
Steering oil temperature sensor circuit
This diagnostic code indicates that the Chassis ECM detects the steering oil temperature 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 0075 FMI 04 is active before performing this procedure.Note: Use a calibrated digital multimeter for this procedure.System Response:
CID 0075 FMI 04 is logged in the ECM Internal memoryTest Step 1. CHECK THE SENSOR
Turn on the disconnect switch and the keyswitch.
Disconnect the sensor from the harness.Expected Result:CID 0075 FMI 04 is active.Results:
OK - CID 0075 FMI 04 is active. Proceed to Test Step 2.
NOT OK - CID 0075 FMI 04 is not active. The sensor has failed.Repair: Replace the sensor.STOPTest Step 2. CHECK THE HARNESS FOR A SHORT TO GROUND
Turn off the disconnect switch and the keyswitch.
Disconnect the harness from the sensor and the ECM.
At the harness connector for the ECM, measure the resistance from the signal contact J2-24 (wire A451-WH(White)) to all possible sources of ground in the harness connectors for the ECM.Expected Result:Each resistance is greater than 5000 ohms.Results:
OK - Each resistance is greater than 5000 ohms. Proceed to Test Step 3.
NOT OK - A resistance is less than 5000 ohms. There is a short between signal contact J2-24 (wire A451-WH(White)) and the circuit with low resistance.Repair: Repair or replace the harness.STOPTest Step 3. CHECK THE DIAGNOSTIC CODEThe keyswitch and the disconnect switch remain off.
Inspect the harness.Clean the harness connector contacts.Inspect the harness connector contacts for corrosion or damage.Inspect the wire insulation for damage caused by heat, corrosion, or chafing.
Perform a 45 N (10 lb) pull test on each circuit wire.
Reconnect all harness connectors. Verify that the connectors are fully seated and the clips are fastened.
Check for intermittent problems. Using Cat® Electronic Technician (Cat ET), perform a wiggle test on the harness.
Turn on the disconnect switch and the keyswitch.
Operate the machine.
Check CID 0075 FMI 04 status.Expected Result:CID 0075 FMI 04 is not active.Results:
OK - CID 0075 FMI 04 is not active.Repair: The initial diagnostic code was probably caused by a poor connection at one of the connectors that was checked.Resume normal operation.STOP
NOT OK - CID 0075 FMI 04 is active. The ECM may have failed.Repair: Exit this procedure and perform this procedure again. Contact the technical communicator at your Cat dealer. If the ECM requires replacement, see Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP