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

Engine Hybrid System. Corolla. Zre142 Aze141
2Zr-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

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, 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

HINT:
Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
The air fuel ratio sensor, which is located between the exhaust manifold and catalyst, consists of alloyed metal elements and a heater.
Depending on the engine operating conditions, the heater heats the sensor elements to activate them. Battery voltage is applied to the heater, the sensor ground is controlled by the ECM using a duty ratio.
The sensor elements convert the oxygen concentration in the exhaust gas into voltage values to output. Based on the voltage, the ECM determines the air fuel ratio and regulates the fuel injection volume depending on the air fuel ratio and engine operating conditions. The voltage changes between 0.6 V and 4.5 V while the engine is running. If the air fuel ratio is lean, which means the oxygen concentration in the exhaust gas is high, the voltage is high. If the air fuel ratio is rich, which means the oxygen concentration in the exhaust gas is low, the voltage is low.

Corolla. Zre142 Aze141.2Zr-Fe Engine Control.Sfi System. Dtc P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)


Corolla. Zre142 Aze141.2Zr-Fe Engine Control.Sfi System. Dtc P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)


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 in air fuel ratio sensor (sensor 1) circuit
  2. Air fuel ratio sensor (sensor 1)
  3. ECM
P2238
  1. Case 1
    Condition (a) or (b) continues for 5.0 seconds or more (2 trip detection logic):
    (a) Voltage at terminal A1A+ is 0.5 V or less.
    (b) Voltage difference between terminals A1A+ and A1A- is 0.1 V or less.
  2. Case 2
    Air fuel ratio sensor admittance is less than 0.0074 1/Ω (2 trip detection logic).
  1. Open or short in air fuel ratio sensor (sensor 1) circuit
  2. Air fuel ratio sensor (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 (sensor 1) circuit
  2. Air fuel ratio sensor (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 (sensor 1) circuit
  2. Air fuel ratio sensor (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 (sensor 1) circuit
  2. Air fuel ratio sensor (sensor 1)
  3. ECM

MONITOR DESCRIPTION

These DTCs are output when there is an open or short in the air fuel ratio sensor circuit, or if air fuel ratio sensor output drops. To detect these problems, the voltage of the air fuel ratio sensor is monitored when turning the ignition switch to the ON, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air fuel ratio sensor is more than 0.5 V, and 4.5 V or less, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the air fuel ratio sensor. If the same malfunction is detected in next driving cycle, the MIL will be illuminated and a DTC will be stored.

MONITOR STRATEGY


Related DTCs
P2237: Air fuel ratio sensor open circuit between A1A+ and A1A-
P2238: Air fuel ratio sensor short circuit between A1A+ and A1A-
P2238: Air fuel ratio sensor short circuit between A1A+ and GND
P2238: Air fuel ratio sensor low admittance
P2239: Air fuel ratio sensor short circuit between A1A+ and +B
P2252: Air fuel ratio sensor short circuit between A1A- and GND
P2253: Air fuel ratio sensor short circuit between A1A- and +B
Required Sensors/Components (Main)
Air fuel ratio sensor
Required Sensors/Components (Related)
Engine coolant temperature sensor
Crankshaft position sensor
Frequency of Operation
Continuous
Duration
10 seconds: P2237, P2238 (low admittance)
5 seconds: Others
MIL Operation
2 driving cycles
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


P2237 and P2238
Monitor runs whenever following DTCs are not present
P0016 (VVT System - Misalignment)
P0017 (Exhaust VVT System - Misalignment)
P0031, P0032 (Air Fuel Ratio Sensor Heater - Sensor 1)
P0102, P0103 (Mass Air Flow Meter)
P0112, P0113 (Intake Air Temperature Sensor)
P0115, P0117, P0118 (Engine Coolant Temperature Sensor)
P0125 (Insufficient Engine Coolant Temperature for Closed Loop Fuel Control)
P0120, P0121 P0122, P0123, P0220, P0222, P0223, P2135 (Throttle Position Sensor)
P0128 (Thermostat)
P0171, P0172 (Fuel System)
P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft Position Sensor)
P0340, P0342, P0343 (Camshaft Position Sensor)
P0451, P0452, P0453 (EVAP System)
P0500 (Vehicle Speed Sensor)
P0505 (Vehicle Speed Sensor IAC Valve)
P219A (Air Fuel Ratio Imbalance)

P2239, P2252 and P2253
Monitor runs whenever the following DTCs are not stored
None

P2237: Air Fuel Ratio Sensor Open Circuit Between A1A+ and A1A-
Estimated sensor temperature
450 to 550°C (842 to 1022°F)
Engine
Running
Battery voltage
11 V or more
Ignition switch
ON
Time after ignition switch is turned from off to ON
5 seconds or more

P2238: Air Fuel Ratio Sensor Low Admittance
Estimated sensor temperature
700 to 800°C (1292 to 1472°F)
Engine coolant temperature
10°C (50°F) or more
Fuel cut
Not executed

Others
Battery voltage
11 V or more
Ignition switch
ON
Time after ignition switch is turned from off to ON
5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS


P2237: (Air Fuel Ratio Sensor Open Circuit Between A1A+ and A1A-)
Air fuel ratio sensor admittance
Less than 0.002 1/Ω

P2238: (Air Fuel Ratio Sensor Low Admittance)
Air fuel ratio sensor admittance
Less than 0.0074 1/Ω

P2238: (Air Fuel Ratio Sensor Short Circuit Between A1A+ and GND)
A1A+ terminal voltage
0.5 V or less

P2238: (Air Fuel Ratio Sensor Short Circuit Between A1A+ and A1A-)
Difference between A1A+ terminal and A1A- terminal voltage
0.1 V or less

P2239: (Air Fuel Ratio Sensor Short Circuit Between A1A+ and +B)
A1A+ terminal voltage
More than 4.5 V

P2252: (Air Fuel Ratio Sensor Short Circuit Between A1A- and GND)
A1A- terminal voltage
0.5 V or less

P2253: (Air Fuel Ratio Sensor Short Circuit Between A1A- and +B)
A1A- terminal voltage
More than 4.5 V

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation) (COROLLA_ZRE142 RM000000PDK0ZAX.html).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Start the engine and wait 5 minutes.
  7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  8. Read the pending DTCs.
    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.

    Techstream 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
    N/A
    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 N/A, idle the engine for 5 minutes and check the DTC judgment result again.
  12. If no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).
    HINT:
    1. If a permanent DTC is output, the system is malfunctioning.
    2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P2195 (Link).

INSPECTION PROCEDURE

HINT:
  1. 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.
  2. Sensor 1 refers to the sensor closest to the engine assembly.
  3. Sensor 2 refers to the sensor farthest away from the engine assembly.
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
    B89-1 (HA1A) - B31-104 (HA1A)
    		Always
    		Below 1 Ω
    B89-3 (A1A+) - B31-103 (A1A+)
    		Always
    		Below 1 Ω
    B89-4 (A1A-) - B31-126 (A1A-)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B89-1 (HA1A) or B31-104 (HA1A) - Body ground
    		Always
    		10 kΩ or higher
    B89-3 (A1A+) or B31-103 (A1A+) - Body ground
    		Always
    		10 kΩ or higher
    B89-4 (A1A-) or B31-126 (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 (COROLLA_ZRE142 RM00000306S01AX.html).


NEXT


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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Clear the DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).

  1. Turn the ignition switch off and wait for at least 30 seconds.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  1. Input the DTC: P2237, P2238, P2239, P2252 or P2253.

  1. Check the DTC judgment result.

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


B
REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)
A

END