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

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

CONFIRMATION DRIVING PATTERN

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 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 (Link).

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

CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON and turn the tester on.
  3. Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).
  4. Turn the ignition switch off and wait for 30 seconds.
  5. Turn the ignition switch to ON and turn the tester on.
  6. Start the engine and wait 5 minutes.
  7. Enter the following menus: Powertrain / Engine and ECT / DTC.
  8. Read the pending DTC.
    HINT:
    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.
  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  10. Input the DTC: P2237, P2238, P2239, P2252 or P2253.
  11. Check the DTC judgment result.

    Tester Display
    		Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    HINT:
    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P2195 (CAMRY_ACV40 RM000000WC40GFX_07.html).

INSPECTION PROCEDURE

HINT:
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor 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 intelligent tester.
  1. Connect the intelligent tester to the DLC3.
  2. Start the engine.
  3. Turn the tester on.
  4. Warm up the engine at 2500 rpm for approximately 90 seconds.
  5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
  6. Perform the 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) displayed on the tester.
HINT:
  1. The Control the Injection Volume for A/F Sensor Active Test lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
  2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Tester Display (Sensor)
Injection Volume
Status
Voltage
AFS Voltage B1S1
(Air fuel ratio)
+25%
Rich
Less than 3.1 V
-12.5%
Lean
More than 3.4 V
O2S B1S2
(Heated oxygen)
+25%
Rich
 More than 0.55 V
-12.5%
Lean
Less than 0.4 V
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.

Case
Air Fuel Ratio Sensor (Sensor 1)
Output Voltage
Heated Oxygen Sensor (Sensor 2)
Output Voltage
Main Suspected Trouble Area
1
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
-
2
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
  1. Air fuel ratio sensor
  2. Air fuel ratio sensor heater
  3. Air fuel ratio sensor circuit
3
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
  1. Heated oxygen sensor
  2. Heated oxygen sensor heater
  3. Heated oxygen sensor circuit
4
Camry. Acv40 Gsv40
Camry. Acv40 Gsv40
  1. Fuel pressure
  2. Gas leakage from exhaust system
    (Air fuel ratio extremely lean or rich)
  1. Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
  2. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 and O2S B1S2; then press the graph button on the Data List screen.
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
  1. Sensor 1 refers to the sensor closest to the engine assembly.
  2. Sensor 2 refers to the sensor farthest away from the engine assembly.
  3. Read freeze frame data using the intelligent tester. 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.
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
    C15-1 (HA1A) - C24-109 (HA1A)
    		Always
    		Below 1 Ω
    C15-3 (A1A+) - C24-112 (A1A+)
    		Always
    		Below 1 Ω
    C15-4 (A1A-) - C24-113 (A1A-)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    C15-1 (HA1A) or C24-109 (HA1A) - Body ground
    		Always
    		10 kΩ or higher
    C15-3 (A1A+) or C24-112 (A1A+) - Body ground
    		Always
    		10 kΩ or higher
    C15-4 (A1A-) or C24-113 (A1A-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the air fuel ratio sensor connector.

  1. Reconnect the ECM connector.



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 (CAMRY_ACV40 RM0000012OI006X.html).


NEXT


3.CHECK WHETHER DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (CAMRY_ACV40 RM000000PDK0LEX.html).

  1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

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

  1. Read the pending DTCs.

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


B
REPLACE ECM (CAMRY_ACV40 RM0000017UO02YX.html)
A

END