REAR AXLE HOUSING AND TRUNNION 7K4509 - Caterpillar

Expected Result:The temperature is less than 38 °C (100 °F). The ambient relative humidity is within the permissible range for calibration of the oxygen sensor.Results:
OK - The ambient conditions are acceptable. Proceed to Test Step 2.
Not OK - The humidity is not acceptable.Repair: Do not calibrate the sensor until the humidity is acceptable.STOPTest Step 2. Check for Diagnostic Codes
Switch the 16 amp circuit breaker ON. Set the engine control to the STOP mode.
Access the "Logged Diagnostic Codes" screen on the Caterpillar Electronic Technician ET. If the following codes are logged, clear the codes:
1086-09 Oxygen Sensor Element not communicating on link
1086-13 Oxygen Sensor Element calibration required
1087-03 Oxygen Buffer Module short to +batt
1087-08 Oxygen Buffer Module noisy signal
1088-05 Oxygen Sensor Power Supply open circuit
1088-06 Oxygen Sensor Power Supply short to ground
Access the "Diagnostic Override" screen of Cat ET. Select "Diagnostics/Diagnostic Tests/Override Parameters".
Turn