11513M Mariner SPRING

Illustration 1 g01256771
Schematic of the circuit for the oxygen buffer and the oxygen sensorTest Step 1. Inspect the Electrical Connectors and the 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 position.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Illustration 2 g01392084
Location of the ECM connectors (typical left front engine view) (1) J2/P2 ECM connectors
Illustration 3 g01392092
Location of the components that are for the oxygen sensor (typical rear engine view) (2) Oxygen buffer (3) Harness connector for the oxygen buffer (4) Connector for the oxygen sensor at the oxygen buffer (5) Connector at the oxygen sensor
Thoroughly inspect connectors (1), (3), (4), and (5) .
Check the allen head screw for each of the ECM connectors for the proper torque.
Illustration 4 g01392118
Terminal locations at the P2 ECM connector for the oxygen sensor (P2-13) +Battery (P2-23) Return (P2-53) Shield (P2-67) Signal from the oxygen sensor
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the oxygen sensor.
Check the harness and wiring for abrasion and for pinch points from the oxygen sensor to the 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 - All of the connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points. The components are in good condition with proper connections. Proceed to Test Step 2.
Not OK - At least one of the connectors, pins, or sockets are not connected properly. At least one of the connectors and/or the wiring has corrosion, abrasion, and/or pinch points.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 2. Check for Diagnostic Codes for the Oxygen Buffer
Establish communication between Cat ET and the ECM. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Access the "Logged Diagnostic Codes" screen on Cat ET. If the following codes are logged, clear the codes:
1088-5 Oxygen Sensor Power Supply current below normal
1088-6 Oxygen Sensor Power Supply current above normal
Start the engine and run the engine. Engine speed must be present in order to activate diagnostic codes. 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". Allow a minimum of ten seconds for the diagnostic codes to be activated.The oxygen buffer is now on. The "Value" of the "Oxygen Sensor Override" should change to "On".Note: After you exit the "Override Parameters" screen, the "Value" of the "Oxygen Sensor Override" is automatically changed to "OFF" when the engine control is not in the START position.
Access the "Logged Diagnostic Codes" screen again. Look for the 1088-5 or 1088-6 diagnostic codes again.Expected Result:A 1088-5 or 1088-6 diagnostic code is logged.Results:
Logged 1088-5 diagnostic code - The supply for the buffer has an open circuit or a short circuit to the +Battery side. Proceed to Test Step 3.
Logged 1088-6 diagnostic code - The supply for the buffer has a short circuit to ground. Proceed to Test Step 4.
No codes - The supply for the buffer is OK.STOPTest Step 3. Check the Supply Voltage for the Oxygen Buffer
Set the engine control to the