Dtc P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (For A/F Sensor) (Bank 1 Sensor 1)


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

REPLACE AIR FUEL RATIO SENSOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 1 Sensor 1)

DTC P2238 Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 1 Sensor 1)

DTC P2239 Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 1 Sensor 1)

DTC P2252 Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 1 Sensor 1)

DTC P2253 Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 1 Sensor 1)


DESCRIPTION

HINT:
If P2237, P2238 and/or P2239 is present, refer to the DTC table for DPF system (LandCruiser RM000000XSN04PX.html).
Refer to DTC P2120 (LandCruiser RM00000187I051X_01.html).

P2237
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
  1. Drive the vehicle at 50 km/h (30 mph) or more for a total of 300 seconds or more.
  2. Check that "Exhaust Temperature B1S1" displays 200°C (392°F) or higher using the GTS.
When either of the following conditions is met (1 trip detection logic):
  1. An open in the circuit between terminals A1A+ and A1A-, voltage difference between terminals A1A+ and A1A- is 0.1 V or less
  2. The resistance of the air fuel ratio sensor element is 250 Ω or higher for 5 seconds or more.
Main trouble area: Open in air fuel ratio sensor circuit
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

P2238
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
The A1A+ voltage is 1.0 V or less
(1 trip detection logic)
Main trouble area: Open in air fuel ratio sensor circuit
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

P2239
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
The A1A- voltage is 1.0 V or less
(1 trip detection logic)
Main trouble area: Short in air fuel ratio sensor circuit
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

P2252
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
Air fuel ratio sensor circuit low (bank 1 sensor 1)
(1 trip detection logic)
Main trouble area: Open in air fuel ratio sensor circuit
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

P2253
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG) for 5 seconds
The A1A- voltage is higher than 4.0 V
(1 trip detection logic)
Main trouble area: Short in air fuel ratio sensor circuit
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

Related Data List
DTC No.
Data List
P2237
P2238
P2239
P2252
P2253
  1. AFS Voltage B1S1
  2. Exhaust Temperature B1S1

MONITOR DESCRIPTION

The air fuel ratio sensor outputs a voltage in proportion to the air-fuel ratio. If impedance (alternating current resistance) or voltage output of the sensor deviates greatly from the standard range, the ECM interprets this as an open or short malfunction of the air fuel ratio sensor circuit.

WIRING DIAGRAM

Refer to DTC P0031 (LandCruiser RM00000187I051X_03.html).

INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AVX.html) and initialization (LandCruiser RM000000TIN08IX.html).
HINT:
Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

  1. Disconnect the air fuel ratio sensor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C131-3 (A1A+) - C152-31 (A1A+)
    		Always
    		Below 1 Ω
    C131-4 (A1A-) - C152-32 (A1A-)
    		Always
    		Below 1 Ω
    C131-3 (A1A+) or C152-31 (A1A+) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    C131-4 (A1A-) or C152-32 (A1A-) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the air fuel ratio sensor connector.

  1. Reconnect the ECM connector.



NG
Go to step 5
OK


2.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (LandCruiser RM000004KGB00OX.html).


NEXT


3.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Warm up the engine.

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).

  1. Drive the vehicle at 50 km/h (30 mph) or more for a total of 300 seconds or more.

    HINT:
    Make sure that the exhaust gas temperature (Exhaust Temperature B1S1) is 200°C (392°F) or higher.

  1. Confirm that the DTC is not output again.



NG
Go to step 4
OK

END

4.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002DX.html).



NEXT
Go to step 6

5.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


6.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Warm up the engine.

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).

  1. Drive the vehicle at 50 km/h (30 mph) or more for a total of 300 seconds or more.

    HINT:
    Make sure that the exhaust gas temperature (Exhaust Temperature B1S1) is 200°C (392°F) or higher.

  1. Confirm that the DTC is not output again.


NEXT

END