5033952 JOHNSON SPACER

Illustration 1 g00995315
Schematic of the circuit for the oxygen buffer and for the oxygen sensorTest 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 connections:
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 (53 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 g00894829
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: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 connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary. Ensure that all of the seals are properly installed. Make sure that the connections are properly fastened. Verify that the repair has eliminated the problem.STOPTest Step 2. Check for Diagnostic Codes for the Oxygen Buffer
Connect Cat ET to the service tool connector on the terminal box. Refer to Troubleshooting, "Electronic Service Tools".
Switch the 16 amp circuit breaker ON. Set the engine control to the STOP mode.
Access the "Logged Diagnostic Codes" screen on Cat ET. If the following codes are logged, clear the codes:
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".
Select "Oxygen Sensor Override" under the "Description" column.
Select "Change" in the lower left corner of the screen. A popup window with the title "Change Parameter Value" will appear.
Select a "New Value" of "On" and then select "OK". Wait for a minimum of ten seconds.The supply circuit for the oxygen buffer is now ON. The "Value" of the "Oxygen Sensor Override" should change to "On".Note: