DESCRIPTION
Refer to DTC P003012.
Click here
HINT:
Although the DTC titles say oxygen sensor, this DTC relate to the air fuel ratio sensor (sensor 1).
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
---|---|---|---|---|---|
P2A0026 | O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold | The calculated value for the air fuel ratio sensor (sensor 1) response rate deterioration level is less than the threshold (2 trip detection logic). |
| Comes on | SAE: P2A00 |
MONITOR DESCRIPTION
After the engine is warmed up, the ECM performs air fuel ratio feedback control to maintain the air fuel ratio at the stoichiometric level. In addition, active air fuel ratio control is performed for approximately 30 seconds after preconditions are met in order to measure the air fuel ratio sensor (sensor 1) response rate. During active air fuel ratio control, the ECM forcibly increases and decreases the injection volume by a certain amount, based on the stoichiometric air fuel ratio learned during normal air fuel ratio control, and measures the air fuel ratio sensor (sensor 1) response rate. The ECM receives a signal from the air fuel ratio sensor (sensor 1) while performing active air fuel ratio control and uses it to calculate the air fuel ratio sensor (sensor 1) response rate deterioration level.
If the value for the air fuel ratio sensor (sensor 1) response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and stores the DTC.
MONITOR STRATEGY
Required Sensors/Components | Air fuel ratio sensor (sensor 1) |
Frequency of Operation | Once per driving cycle |
TYPICAL ENABLING CONDITIONS
Active air fuel ratio control | Performing |
Active air fuel ratio control performed when following conditions met | - |
Engine coolant temperature | 75°C (167°F) or higher |
Idling | Off |
Engine speed | 1000 rpm or more, and less than 3000 rpm |
Air fuel ratio sensor status | Activated |
Engine load | 10% or higher, and less than 100% |
Catalyst monitor | Not yet |
Mass air flow | 4 gm/sec or more, and less than 16 gm/sec |
CONFIRMATION DRIVING PATTERN
HINT:
Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
GTS Display | Description |
---|---|
NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
GTS Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
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INCOMPLETE |
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HINT:
WIRING DIAGRAM
Refer to DTC P003012.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
PROCEDURE
1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A0026) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
P2A0026 and other DTCs are output | A |
P2A0026 is output | B |
HINT:
If any DTCs other than P2A0026 are output, troubleshoot those DTCs first.
A | GO TO DTC CHART |
|
2. | PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) |
(a) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
(b) Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.
(c) Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.
(d) Monitor the output values of the air fuel ratio sensor (sensor 1) and air fuel ratio sensor (sensor 2) (A/F (O2) Sensor Current B1S1 and A/F (O2) Sensor Current B1S2) displayed on the GTS.
Powertrain > Engine > Active Test Active Test Display |
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Control the Injection Volume for A/F Sensor |
Data List Display |
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Coolant Temperature |
Injection Volume |
A/F (O2) Sensor Current B1S1 |
A/F (O2) Sensor Current B1S2 |
HINT:
GTS Display (Sensor) | Injection Volume | Status | Value |
---|---|---|---|
A/F (O2) Sensor Current B1S1 (Air fuel ratio (sensor 1)) | 12.5% | Rich | Below -0.075 mA |
-12.5% | Lean | Higher than 0.037 mA | |
A/F (O2) Sensor Current B1S2 (Air fuel ratio (sensor 2)) | 12.5% | Rich | Below -0.86 mA |
-12.5% | Lean | Higher than 0.33 mA |
HINT:
Refer to "Data List / Active Test" [A/F (O2) Sensor Voltage B1S1, A/F (O2) Sensor Current B1S2.
Click here
Status of A/F (O2) Sensor Current B1S1 | Status of A/F (O2) Sensor Current B1S2 | Air Fuel Ratio Condition and Air Fuel Ratio Sensor (Sensor 1) Condition | Proceed to |
---|---|---|---|
Lean/Rich | Lean/Rich | Normal | A |
Lean | Lean | Actual air fuel ratio lean | B |
Rich | Rich | Actual air fuel ratio rich | B |
Lean | Lean/Rich | Air fuel ratio sensor (sensor 1) malfunction | C |
Rich | Lean/Rich | Air fuel ratio sensor (sensor 1) malfunction | C |
B | GO TO STEP 5 |
C | GO TO STEP 13 |
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3. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
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4. | CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026) |
(a) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(b) Perform the All Readiness.
Powertrain > Engine > Utility Tester Display |
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All Readiness |
(c) Input the DTC: P2A0026.
(d) Check the DTC judgment result.
Result | Proceed to |
---|---|
NORMAL (DTCs are not output) | A |
ABNORMAL (P2A0026 is output) | B |
A | END |
B | GO TO STEP 13 |
5. | INSPECT AIR FUEL RATIO SENSOR (SENSOR 1) (HEATER RESISTANCE) |
Click here
NG | REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) |
|
6. | CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks in the intake system.
NG | REPAIR OR REPLACE INTAKE SYSTEM |
|
7. | CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks.
NG | REPAIR OR REPLACE EXHAUST SYSTEM |
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8. | CHECK FUEL PRESSURE (LOW PRESSURE SIDE) |
Click here
NG | GO TO STEP 16 |
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9. | READ VALUE USING GTS (FUEL PRESSURE (HIGH)) |
(a) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(b) Read the Data List when idling.
Powertrain > Engine > Data List Tester Display |
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Engine Speed |
Coolant Temperature |
Fuel Pressure (High) |
Injection Mode |
Result | Proceed to |
---|---|
The value of Fuel Pressure (High) is between 3000 kPag and 5000 kPag | A |
None of the above conditions are met | B |
B | REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE) |
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10. | READ VALUE USING GTS (FUEL PRESSURE (HIGH)) |
(a) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(b) Read the Data List at 3000 rpm.
Powertrain > Engine > Data List Tester Display |
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Engine Speed |
Coolant Temperature |
Fuel Pressure (High) |
Injection Mode |
Result | Proceed to |
---|---|
The value of Fuel Pressure (High) is between 4000 kPag and 20000 kPag | A |
None of the above conditions are met | B |
B | REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE) |
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11. | INSPECT PORT FUEL INJECTOR ASSEMBLY |
(a) Inspect the port fuel injector assembly (whether fuel volume is high or low, and whether injection pattern is poor).
Click here
HINT:
Click here
NG | REPLACE PORT FUEL INJECTOR ASSEMBLY |
|
12. | INSPECT DIRECT FUEL INJECTOR ASSEMBLY |
Click here
HINT:
Click here
NG | REPLACE DIRECT FUEL INJECTOR ASSEMBLY |
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13. | REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) |
HINT:
Click here
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).
Click here
|
14. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
15. | CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026) |
(a) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(b) Perform the All Readiness.
Powertrain > Engine > Utility Tester Display |
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All Readiness |
(c) Input the DTC: P2A0026.
(d) Check the DTC judgment result.
Result | Proceed to |
---|---|
NORMAL (DTCs are not output) | A |
ABNORMAL (P2A0026 is output) | B |
A | END |
B | REPLACE ECM |
16. | CHECK FUEL LINE (FOR LOW PRESSURE SIDE) |
(a) Check the fuel lines (for low pressure side) for leaks or blockage.
OK | GO TO FUEL PUMP CONTROL CIRCUIT |
NG | REPAIR OR REPLACE FUEL LINE (FOR LOW PRESSURE SIDE) |
The front seat belt pretensioners are designed to deploy in moderate or severe frontal, near frontal collisions.
In addition, the pretensioners operate when a side collision or a rollover accident is detected. The pretensioners operate differently depending on what types of air bags are equipped. For more details about the seat belt pretensioner operation, refer to the SRS Air Bag Deployment Criteria.