SFI SYSTEM(w/ EGR System), Diagnostic DTC:P2237,P2238,P2239,P2240,P2241,P2242,P2252,P2253,P2255 and P2256
| DTC Code | DTC Name |
|---|---|
| P2237 | Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) |
| P2238 | Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1) |
| P2239 | Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1) |
| P2240 | Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 2 Sensor 1) |
| P2241 | Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 2 Sensor 1) |
| P2242 | Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 2 Sensor 1) |
| P2252 | Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1) |
| P2253 | Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1) |
| P2255 | Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1) |
| P2256 | Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 2 Sensor 1) |
DESCRIPTION
Refer to DTC P2195.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Memory |
|---|---|---|---|---|---|
P2237 |
Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) |
Open in the circuit between terminals AF+ and AF- of the air fuel ratio sensor while the engine is running (2 trip detection logic). |
|
Comes on |
DTC stored |
P2238 |
Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1) |
Condition (a) or (b) continues for 5.0 seconds or more (2 trip detection logic): (a) AF+ voltage is 0.5 V or less. (b) (AF+) - (AF-) is 0.1 V or less.
Air fuel ratio sensor admittance is below 0.022 1/Ω (2 trip detection logic). |
|
Comes on |
DTC stored |
P2239 |
Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1) |
AF+ voltage is higher than 4.5 V for 5.0 seconds or more (2 trip detection logic). |
|
Comes on |
DTC stored |
P2240 |
Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 2 Sensor 1) |
Open in the circuit between terminals AF+ and AF- of the air fuel ratio sensor while the engine is running (2 trip detection logic). |
|
Comes on |
DTC stored |
P2241 |
Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 2 Sensor 1) |
Condition (a) or (b) continues for 5.0 seconds or more (2 trip detection logic): (a) AF+ voltage is 0.5 V or less. (b) (AF+) - (AF-) is 0.1 V or less.
Air fuel ratio sensor admittance is below 0.022 1/Ω (2 trip detection logic). |
|
Comes on |
DTC stored |
P2242 |
Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 2 Sensor 1) |
AF+ voltage is higher than 4.5 V for 5.0 seconds or more (2 trip detection logic). |
|
Comes on |
DTC stored |
P2252 |
Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1) |
AF- voltage is 0.5 V or less for 5.0 seconds or more (2 trip detection logic). |
|
Comes on |
DTC stored |
P2253 |
Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1) |
AF- voltage is higher than 4.5 V for 5.0 seconds or more (2 trip detection logic). |
|
Comes on |
DTC stored |
P2255 |
Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1) |
AF- voltage is 0.5 V or less for 5.0 seconds or more (2 trip detection logic). |
|
Comes on |
DTC stored |
P2256 |
Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 2 Sensor 1) |
AF- voltage is higher than 4.5 V for 5.0 seconds or more (2 trip detection logic). |
|
Comes on |
DTC stored |
DTCs P2237, P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.
DTCs P2240, P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.
Bank 1 refers to the bank that includes the No. 1 cylinder.
Bank 2 refers to the bank that includes the No. 2 cylinder.
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 engine switch on (IG), 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 outside of the specified range, or the admittance is below 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 the next driving cycle, the MIL is illuminated and a DTC is stored.
The air fuel ratio sensor varies its output voltage in proportion to the air-fuel ratio. If the air fuel ratio sensor impedance (alternating current resistance) or output voltage deviates greatly from the standard range, the ECM determines that there is an open or short in the air fuel ratio sensor circuit.
MONITOR STRATEGY
Required Sensors/Components (Main) |
Air fuel ratio sensor |
Frequency of Operation |
Continuous |
CONFIRMATION DRIVING PATTERN
Start the engine and wait for 5 minutes or more.
WIRING DIAGRAM
Refer to DTC P2195.
CAUTION / NOTICE / HINT
Refer to "Data List / Active Test" [AFS Voltage B1S1 and AFS Voltage B2S1] (See page ).
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.
PROCEDURE
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
Disconnect the air fuel ratio sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
C20-1 (HA1A) - C31-17 (HA1A)
Always
Below 1 Ω
C20-3 (A1A+) - C30-1 (A1A+)
Always
Below 1 Ω
C20-4 (A1A-) - C30-2 (A1A-)
Always
Below 1 Ω
C19-1 (HA2A) - C31-19 (HA2A)
Always
Below 1 Ω
C19-3 (A2A+) - C30-7 (A2A+)
Always
Below 1 Ω
C19-4 (A2A-) - C30-8 (A2A-)
Always
Below 1 Ω
C20-1 (HA1A) or C31-17 (HA1A) - Body ground
Always
10 kΩ or higher
C20-3 (A1A+) or C30-1 (A1A+) - Body ground
Always
10 kΩ or higher
C20-4 (A1A-) or C30-2 (A1A-) - Body ground
Always
10 kΩ or higher
C19-1 (HA2A) or C31-19 (HA2A) - Body ground
Always
10 kΩ or higher
C19-3 (A2A+) or C30-7 (A2A+) - Body ground
Always
10 kΩ or higher
C19-4 (A2A-) or C30-8 (A2A-) - Body ground
Always
10 kΩ or higher
Result
Result
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
REPLACE AIR FUEL RATIO SENSOR
Replace the air fuel ratio sensor.
Result
Result
NEXT
CHECK WHETHER DTC OUTPUT RECURS
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Clear the DTCs.
Powertrain > Engine and ECT > Clear DTCs
Start the engine.
Allow the engine to idle for 5 minutes or more.
Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.
Read the pending DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
Result
Proceed to
No DTC is output
A
P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256 is output
B
A END