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

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

REPLACE AIR FUEL RATIO SENSOR

CHECK WHETHER DTC OUTPUT RECURS (DTC P2237, P2238, P2239, P2252 OR P2253)

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

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

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

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

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


DESCRIPTION

Refer to DTC P2195 (HILUX_TGN26 RM000000WC40R3X_01.html).
HINT:
  1. Although the DTC titles refer to the oxygen sensor, these DTCs relate to the air fuel ratio sensor.
  2. Sensor 1 refers to the sensor mounted in front of the three way catalytic converter and located near the engine assembly.

DTC No.
DTC Detection Condition
Trouble Area
P2237
An open in the circuit between terminals A1A+ and A1A- of the air fuel ratio sensor while the engine is running (2 trip detection logic).
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM
P2238
One of the following conditions is met (2 trip detection logic):
  1. The air fuel ratio sensor output drops while the engine is running.
  2. The voltage at terminal A1A+ is 0.5 V or less.
  3. The voltage difference between terminals A1A+ and A1A- is 0.1 V or less.
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM
P2239
The A1A+ voltage is higher than 4.5 V (2 trip detection logic).
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM
P2252
The A1A- voltage is 0.5 V or less (2 trip detection logic).
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM
P2253
A1A- voltage is higher than 4.5 V (2 trip detection logic).
  1. Open or short in air fuel ratio sensor circuit
  2. Air fuel ratio sensor
  3. ECM

WIRING DIAGRAM

Refer to DTC P2195 (HILUX_TGN26 RM000000WC40R3X_07.html).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. 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, if the air fuel ratio was lean or rich, 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 (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C85-3 (A1A+) - C97-7 (A1A+)
    		Always
    		Below 1 Ω
    C85-4 (A1A-) - C97-1 (A1A-)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    C85-3 (A1A+) or C97-7 (A1A+) - Body ground
    		Always
    		10 kΩ or higher
    C85-4 (A1A-) or C97-1 (A1A-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.



  1. Reconnect the air fuel ratio sensor connector.


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
OK


2.REPLACE AIR FUEL RATIO SENSOR

  1. Replace the air fuel ratio sensor (HILUX_TGN26 RM00000142300ZX.html).


NEXT


3.CHECK WHETHER DTC OUTPUT RECURS (DTC P2237, P2238, P2239, P2252 OR P2253)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK12LX.html).

  1. Switch the ECM from normal mode to check mode (HILUX_TGN26 RM000000PDL0LAX.html).

  1. Drive the vehicle according to Confirmation Driving Pattern (HILUX_TGN26 RM000000WC40R3X_08.html).

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs (Pending DTCs).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC P2237, P2238, P2239, P2252 or P2253 is output
    		B


B
REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)
A

END