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). |
|
P2238 |
|
|
P2239 |
The A1A+ voltage is higher than 4.5 V (2 trip detection logic). |
|
P2252 |
The A1A- voltage is 0.5 V or less (2 trip detection logic). |
|
P2253 |
The A1A- voltage is higher than 4.5 V (2 trip detection logic). |
|
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) |
Monitor runs whenever following DTCs not stored |
None |
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 |
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 |
Battery voltage |
11 V or higher |
Ignition switch |
ON |
Time after ignition switch is turned from off to ON |
5 seconds or more |
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 |
Air fuel ratio sensor admittance |
Below 0.0074 1/Ω |
A1A+ terminal voltage |
0.5 V or less |
A1A+ terminal voltage |
Higher than 4.5 V |
A1A- terminal voltage |
0.5 V or less |
A1A- terminal voltage |
Higher than 4.5 V |
Difference between A1A+ terminal and A1A- terminal voltage |
0.1 V or less |
CONFIRMATION DRIVING PATTERN
HINT:
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
HINT:
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:
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) |
(a) Disconnect the air fuel ratio sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
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 |
NG | ![]() |
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.
(c) Turn the Techstream 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 |
A | ![]() |
END |
B | ![]() |
REPLACE ECM |
System Description
SYSTEM DESCRIPTION
1. SEAT BELT WARNING SYSTEM DESCRIPTION
If a seat belt is not fastened, this system flashes the seat belt warning light
or sounds the seat belt warning buzzer as a reminder.
(a) Driver side seat belt warning light:
When the driver side ...
Precaution
PRECAUTION
1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL
NOTICE:
After the ignition switch is turned off, the navigation receiver assembly
records various types of memory and settings. As a result, after turning
the ig ...
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE COOLER DRYER
(a) Using a 14 mm straight hexagon wrench, remove the cap from the modulator.
Text in Illustration
*1
14 mm Straight Hexagon Wrench
*2 ...