WASHER-THRUST 5N4383 - Caterpillar

System Operation Description:Periodic calibration of the oxygen sensor is required in order to ensure accurate readings and optimum engine performance. See the Operation And Maintenance Manual for the maintenance interval schedule. The engine must be stopped and the sensor must be removed. The sensor must be placed in uncontaminated air in order to calibrate the sensor. The air must be free of exhaust.During the calibration, the master Electronic Control Module (ECM) first establishes the reference for zero percent of oxygen by reading the sensor after the sensor has cooled for two minutes. The master ECM energizes the heater in the sensor for five minutes. Last, the ECM reads the percent of oxygen in the surrounding air. The surrounding air is assumed to be clean with approximately 20.95 percent oxygen. The calibration offset and the calibration range are determined from these two points.
Illustration 1 g00995315
Schematic of the circuit for the oxygen sensor and for the oxygen bufferTest Step 1. Inspect the Electrical Connectors and Wiring
During operation, the oxygen sensor may reach temperatures that exceed 700 °C (1292 °F). Severe personal injury and property damage will result from contact with a hot oxygen sensor.Do not touch the sensor during engine operation, calibration, or testing. Allow the sensor to cool before moving the sensor. Wear gloves that resist heat. Do not place the sensor on or near any flammable material or any surface that can be damaged by high temperatures.
Set the engine control to the OFF/RESET mode. Switch the 16 amp circuit breaker OFF.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Illustration 2 g00995319
Terminal box for the master ECM (1) J2/P2 connectors for the master ECM (2) J10/P10 connectors for the harness from the oxygen buffer (3) 16 amp circuit breaker
Thoroughly inspect the following connectors:
Master ECM J2/P2 connectors
J10/P10 connectors on the terminal box
Check the torque of the Allen head screw for the ECM connectors. The proper torque is 6 1 N m (55 9 lb in).
Illustration 3 g00995318
Harness side of the master ECM P2 connector (P2-13) 24 VDC for the buffer (P2-23) Return (P2-53) Shield (P2-67) Oxygen signal (PWM)
Illustration 4 g00894295
Harness side of the P10 connector (P10-H) Shield (P10-K) 24 VDC for the buffer (P10-L) Return (P10-M) Oxygen signal (PWM)
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the oxygen buffer.
Illustration 5 g00904231
Components for the sensing of oxygen (4) Oxygen sensor (5) Connectors for the oxygen sensor (6) Oxygen buffer (7) J651/P651 connectors for the harness from the terminal box (8) J652/P652 connectors for the harness from the oxygen sensor
Check the harness and wiring for abrasion and for pinch points from the oxygen sensor to the master ECM.Expected Result:All of the connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - The components are not in good condition and/or at least one of the