AT 261 - Chapter 8e O2 Sensors, Loop Control, and DiagnosisName: _________________________________________Date: __________________________________________O2 Sensor DataO2 Sensor will not work below 600 deg F0.1v = Lean0.9v = RichInternal heater turns on @ PCM power up (when the vehicle is turned on). - see page 221 in the classroom manual.Bank 1 - Side of engine that has cylinder #1 - (HO2S 1/1)Bank 2 - Other side of engine (if applicable) (HO2S 2/1)Sensor 1 - Pre Cat (HO2S 1/2)Sensor 2 - Post Cat (HO2S 2/2)O2 Heater TestingTools you will need:2001 Honda AccordDVOMVehicle Engine Performance SchematicGenisys Scan ToolHow many O2 sensors are on this vehicle? _____________________________How many wires are on each O2 sensor? _____________________________What are the wire colors for the PRIMARY O2 Sensor heater circuit? ________________________What are the wire colors for the PRIMARY O2 Sensor (voltage generator) circuit? ________________________Where does the schematic say the primary O2 sensor is located? ____________________________Where does the schematic say the secondary O2 sensor is located? _________________________ Locate and disconnect the primary O2 sensor from its harness. Place the DVOM to read resistance.What is the resistance of the heater in the O2 sensor? ___________________________Was the resistance near 15 Ohms? ____________________Note: An open heater will cause a code for the O2 heater circuit, and cause a longer warm up time. This is more time spent in "open loop" and will cause higher cold vehicle emissions. Most cars go into open loop at WOT and Idle. Leave the O2 sensor disconnected. Still leaving the O2 sensor disconnected, start and run the vehicle. Run the vehicle at 2000 RPM for 1 min. Turn the vehicle OFF. Is the check engine lamp on? ___________________________Using the scan tool (Scan Diagnostics -> Global OBDII -> Ok -> Enter -> Diag Trouble Codes) what is the code that is present in the PCMs memory?_____________________________________________________________________________ Turn the vehicle OFF Reconnect the O2 sensor1 Turn the vehicle ON Clear the code. Turn of the vehicle, and disconnect the scan tool.O2 Catalyst Monitor Testing Pre Cat and Post CatThere are (is) an additional O2 sensor after the catalyst converter that can monitor the performance of the catalytic converter. The pre-converter O2 sensor should oscillate between high and low (rich and lean), while the post-converter should read a 'flat' near perfect stoichiometric a/f ratio. Bank 1 - Right side of engine (HO2S 1/1)Bank 2 - Left side of engine (HO2S 2/1)Sensor 1 - Pre Cat (Upstream) (HO2S 1/1)Sensor 2 - Post Cat (Downstream) (HO2S 1/2)Tools you will need:2001 Ford Windstar (Red)Genisys Scan Tool Turn the vehicle to the "ON" position (DO NOT START THE VEHICLE!) Locate the DLC (Data Link Connector) Connect the scan tool to the DLC On the scan tool, select "(Scan Diagnostics -> Global OBDII -> Ok -> Enter -> Datastream - > PCM/ENGINE)  Disable the graph (button labeled "analog -> digital") for engine RPM. Locate in the data stream "Fuel Sys Status BNK 1" - choose the one reading "Open or Closed" Next press "to top" Locate in the data stream "O2 Sensor 1/1 Volts" (Pre-Cat) Highlight this sensor, press "graph"  Next press "to top" Scroll farther down and locate "O2 Sensor 1/2 Volts" (Post-Cat) Highlight this sensor, press "graph"  Next press "to top" With these 3 data lines at the head of the display, start the vehicle. Watch the O2 sensors, once the vehicle is in closed loop watch the voltage of the primary and secondary O2 sensors.The voltage of the secondary O2 sensor should read "rich" until it and the catalytic converter reach operating temperate. Run the engine at 2000 RPM for 1 min. (Needed to warm up cat and O2 sensors fully)Note: The post-converter O2 sensor should read a "gliding" voltage if the cat is functional. If the cat is missing or 'dead' it will read the same as the O2 sensor farther upstream in the exhaust. This will set a code. This setup is only found on OBD II vehicles. The MIL will come on at above 1.5% the set pollution levels.Is the primary O2 sensor switching from rich to lean? _______________________Does the secondary O2 sensor read “flat” or “near flat” compared to the pre-cat O2 sensor? ___________________Is this catalyst working properly? ________________________ Turn of the engine, and disconnect the scan tool.2O2 TestingTools you will need:2001 Ford Windstar (Black)Genisys Scan ToolBottle of Propane Turn the vehicle to the "ON" position (DO NOT START THE VEHICLE!) Locate the DLC (Data Link Connector) Connect the scan tool to the DLC On the scan tool, select "(Scan Diagnostics -> Global OBDII -> Ok -> Enter -> Datastream - > PCM/ENGINE)  Disable the graph (button labeled "analog -> digital") for engine RPM. Locate in the data stream "Fuel Sys Status BNK 1" - choose the one reading "Open or Closed" Next press "to top" Locate in the data stream "O2 Sensor 1/1 Volts" (Pre-Cat) Highlight this sensor, press "graph"  Next press "to top" Scroll farther down and locate "O2 Sensor 1/2 Volts" (Post-Cat) Highlight this sensor, press "graph"  Next press "to top" Locate in the data stream "O2 Sensor 2/1 Volts" (Pre-Cat) Highlight this sensor, press "graph"  Next press "to top" Locate in the data stream "O2 Sensor 1/2 Volts" (Pre-Cat) Highlight this sensor, press "graph"  Next press "to top"Your screen should show four O2 sensors graphed, and Fuel Loop Status all at the top of the screen.(5 total items) Write down the following information as it is shown on the scan tool.HO2S Bank 1 Sensor 1 __________________________ (Highest/Lowest) (Volts) HO2S Bank 2 Sensor 1 __________________________ (Highest/Lowest) (Volts) HO2S Bank 2 Sensor 1 __________________________ (Highest/Lowest) (Volts) HO2S Bank 2 Sensor 2 __________________________ (Highest/Lowest) (Volts) Fuel System Status __________________________ (Open/Closed) Start the vehicle.What happens to the graphs on the O2 sensors? ____________________________Fuel System Status __________________________ (Open/Closed)HO2S Bank 1 Sensor 1 __________________________ (Highest/Lowest) (Volts) HO2S Bank 2 Sensor 1 __________________________ (Highest/Lowest) (Volts)  Run the vehicle at 2000 RPM for 1 min.