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P2237





2GR-FE ENGINE CONTROL: SFI SYSTEM: P2237-P2239,P2240-P2242,P2252,P2253,P2255,P2256: Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)


DESCRIPTION

HINT
- Although the DTC titles include oxygen sensor, these DTCs relate to the air fuel ratio sensor.
- Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

The air fuel ratio sensor generates voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor is the planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are narrower than the conventional type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, therefore the sensor activation is accelerated.

A three-way catalytic converter is used in order to convert the carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) into less harmful substances. To allow the three-way catalytic converter to function effectively, it is necessary to keep the air fuel ratio of the engine near the stoichiometric air fuel ratio.

*: Value changes inside the ECM. Since the air fuel ratio sensor is the current output element, a current is converted to a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.









HINT
- DTCs P2237, P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.
- DTCs P2240, P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.
- Bank 1 refers to the bank that includes cylinder No. 1.
- Bank 2 refers to the bank that does not include cylinder No. 1.

MONITOR DESCRIPTION

The air fuel ratio sensor varies its output voltage in proportion to the air fuel ratio. If the air fuel ratio sensor impedance (alternating current resistance) or voltage output deviates greatly from the standard range, the ECM determines that there is an open or short malfunction in the air fuel ratio sensor circuit.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





P2237 and P2240 (Air Fuel Ratio Sensor Open Circuit between A1A+ and A1A-/A2A+ and A2A-)

P2237 and P2240 (Air Fuel Ratio Sensor Open Circuit between A1A+ and A1A-/A2A+ and A2A-):





P2238 and P2241 (Low Admittance)

P2238 and P2241 (Low Admittance):





Others

Others:





TYPICAL MALFUNCTION THRESHOLDS

P2237 and P2240 (Open Circuit between A1A+ and A1A-/A2A+ and A2A-)

P2237 and P2240 (Open Circuit between A1A+ and A1A-/A2A+ and A2A-):





P2238 and P2241 (Short Circuit between A1A+ and GND/A2A+ and GND)

P2238 and P2241 (Short Circuit between A1A+ and GND/A2A+ and GND):





P2238 and P2241 (Short Circuit between A1A+ and A1A-/A2A+ and A2A-)

P2238 and P2241 (Short Circuit between A1A+ and A1A-/A2A+ and A2A-):





P2239 and P2242 (Short Circuit between A1A+ and +B/A2A+ and +B)

P2239 and P2242 (Short Circuit between A1A+ and +B/A2A+ and +B):





P2252 and P2255 (Short Circuit between A1A- and GND/A2A- and GND)

P2252 and P2255 (Short Circuit between A1A- and GND/A2A- and GND):





P2253 and P2256 (Short Circuit between A1A- and +B/A2A- and +B)

P2253 and P2256 (Short Circuit between A1A- and +B/A2A- and +B):





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the ignition switch ON and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.

4. Turn the ignition switch off and wait for 30 seconds.

5. Turn the ignition switch ON and turn the Techstream on [A].

6. Start the engine and wait 2 minutes.

7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

8. Read the pending DTC [B].

9. If a pending DTC is output, the system is malfunctioning.

HINT
If a pending DTC is not output, perform the following procedure.

10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

11. Input the DTC: P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256.

12. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 3 minutes.

13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

14. Check the judgment result [C].

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.

15. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P2195 P2195.

INSPECTION PROCEDURE

HINT
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the Techstream.

1. Connect the Techstream to the DLC3.

2. Start the engine.

3. Turn the Techstream on.

4. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.

5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.

6. Perform Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).

7. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.

HINT
- The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by -12.5% or increases the injection volume by 25%.
- Each sensor reacts in accordance with increases and decreases in the fuel injection volume.





NOTICE:
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.





* Performing Control the Injection Volume for A/F Sensor enables technicians to check and graph the output voltages of both the air fuel ratio and heated oxygen sensors.

* To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 and O2S B2S1 or AFS Voltage B1S2 and O2S B2S2.

HINT
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the air fuel ratio sensor connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
OK -- Continue to next step.

2. REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor Removal.

NEXT -- Continue to next step.

3. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (even if no DTCs are stored, perform the Clear DTC procedure) DTC Check / Clear.

(e) Start the engine.

(f) Allow the engine to idle for 2 minutes.

(g) Enter the following menus: Powertrain / Engine / Utility / All Readiness.

(h) Input the DTC: P2238, P2241, P2239, P2242, P2252, P2255, P2253 or P2256.

(i) Check the DTC judgment result.

Result:





B -- REPLACE ECM Removal

A -- END
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