Toyota Venza: Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) (P2237-P2239,P2252,P2253)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) (P2237-P2239,P2252,P2253)

DESCRIPTION

Refer to DTC P2195 (See page ).

HINT:

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.

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).	Open in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM
P2238	Case 1 Condition (a) or (b) continues for 5.0 seconds or more (2 trip detection logic) Voltage at terminal A1A+ is 0.5 V or less. Voltage difference between terminals A1A+ and A1A- is 0.1 V or less. Case 2 Air fuel ratio sensor admittance: Less than 0.0074 1/Ω (2 trip detection logic)	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM
P2239	The A1A+ voltage is higher than 4.5 V (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM
P2252	The A1A- voltage is 0.5 V or less (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM
P2253	The A1A- voltage is higher than 4.5 V (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM

MONITOR DESCRIPTION

These DTCs are output when there is an open or short in the air fuel ratio sensor circuit, or if the 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 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 between 0.6 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM determines that there is a malfunction in the air fuel ratio sensor. If the same malfunction is detected in next driving cycle, the MIL is illuminated and a DTC is 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 Impedance 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	P2237: 10 seconds P2238 (air fuel ratio sensor low impedance): 10 seconds Other: 5 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

P2237 and P2238

Monitor runs whenever following DTCs not stored

P0016 (VVT System - Misalignment)

P0017 (Exhaust VVT System - Misalignment)

P0031, P0032, P101D (Air Fuel Ratio Sensor Heater)

P0102, P0103 (Mass Air Flow Meter)

P0112, P0113 (Intake Air Temperature Sensor)

P0115, P0117, P0118 (Engine Coolant Temperature Sensor)

P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle Position Sensor)

P0128 (Thermostat)

P0171, P0172 (Fuel System)

P0300 - P0304 (Misfire)

P0335 (Crankshaft Position Sensor)

P0340 (Camshaft Position Sensor)

P0451, P0452, P0453 (EVAP System)

P0500 (Vehicle Speed Sensor)

P0505 (Idle Speed Control)

P219A, P219C, P219D, P219E, P219F (Air Fuel Ratio Imbalance)

P2238, P2252 and P2253

Monitor runs whenever following DTCs 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 higher
Ignition switch	ON
Time after ignition switch is OFF to ON	5 seconds or more

P2238 (Air Fuel Ratio Sensor Low Impedance)

Estimated sensor temperature	700 to 800°C (1292 to 1472°F)
Engine coolant temperature	10°C (50°F) or higher (varies with engine coolant temperature at engine start)
Fuel cut	Not executed

P2238 (Air Fuel Ratio Sensor Short Circuit Between A1A+ and A1A-, GND)

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

Other

Battery voltage	11 V or higher
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

Below 0.002 1/Ω

P2238 (Air Fuel Ratio Sensor Low Impedance)

Air fuel ratio sensor admittance

Below 0.0074 1/Ω

P2238 (Air Fuel Ratio Sensor Short Circuit Between A1A+ and GND)

A1A+ terminal voltage

0.5 V or less

P2239 (Air Fuel Ratio Sensor Short Circuit Between A1A+ and +B)

A1A+ terminal voltage

Higher 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

Higher than 4.5 V

P2238 (Air Fuel Ratio Sensor Short Circuit Between A1A+ and A1A-)

Difference between A1A+ terminal and A1A- terminal voltage

0.1 V or less

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine and wait 5 minutes.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the Pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P2237, P2238, P2239, P2252 or P2253.

Check the DTC judgment result.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, idle the engine for 5 minutes and check the DTC judgment result again.

If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
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 (See page ).

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

Refer to "Data List / Active Test" [AFS Voltage B1S1] (See page ).

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 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.
Sensor 1 refers to the sensor closest to the engine assembly
Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

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

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
B7-1 (HA1A) - B58-18 (HA1A)	Always	Below 1 Ω
B7-3 (A1A+) - B58-103 (A1A+)	Always	Below 1 Ω
B7-4 (A1A-) - B58-126 (A1A-)	Always	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
B7-1 (HA1A) or B58-18 (HA1A) - Body ground	Always	10 kΩ or higher
B7-3 (A1A+) or B58-103 (A1A+) - Body ground	Always	10 kΩ or higher
B7-4 (A1A-) or B58-126 (A1A-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor (See page ).

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (See page ).

3.	CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Clear the DTCs (See page ).

(e) Turn the ignition switch off and wait for at least 30 seconds.

(f) Start the engine.

(g) Allow the engine to idle for 5 minutes or more.

(h) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(i) Read the pending DTCs.

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

END

REPLACE ECM

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