DESCRIPTION
Refer to DTC P003012.
Click here
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 |
|
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 | Less than 4000 rpm |
Air fuel ratio sensor status | Activated |
Engine load | 10% or higher, and less than 70% |
Catalyst monitor | Not executing |
Mass air flow | 8 gm/sec or more, and less than 23.8 gm/sec |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
Click here
Click here
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the engine stops, further depress the accelerator pedal to restart the engine.
HINT:
GTS Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
If the engine stops, further depress the accelerator pedal to restart the engine.
HINT:
GTS Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
Refer to DTC P003012.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Click here
(Select Powertrain in Health Check and then check the time stamp data.)
Click here
HINT:
PROCEDURE
1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A0026) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes
Result | Proceed to |
---|---|
DTC P2A0026 is output |
A |
DTC P2A0026 and other DTCs are output |
B |
HINT:
If any DTCs other than P2A0026 are output, troubleshoot those DTCs first.
B |
![]() | GO TO DTC CHART |
|
2. |
PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) |
(a) Put the engine in Inspection Mode (Maintenance Mode).
Powertrain > Hybrid Control > Utility
Tester Display |
---|
Inspection Mode |
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
(c) Idle the engine for 5 minutes or more with park (P) selected.
(d) Enter the following menus.
Powertrain > Engine > Active Test
Active Test Display |
---|
Control the Injection Volume for A/F Sensor |
Data List Display |
---|
Coolant Temperature |
A/F (O2) Sensor Current B1S1 |
A/F (O2) Sensor Current B1S2 |
(e) Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.
(f) 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.
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 |
More 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 |
More than 0.33 mA |
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 | |
Lean | Lean/Rich |
Air fuel ratio sensor (sensor 1) malfunction |
C |
Rich |
Lean/Rich | Air fuel ratio sensor (sensor 1) malfunction |
HINT:
Refer to "Data List / Active Test" [A/F (O2) Sensor Voltage B1S1, A/F (O2) Sensor Voltage B2S1, A/F (O2) Sensor Current B1S2 and A/F (O2) Sensor Current B2S2].
Click here
B |
![]() | GO TO STEP 7 |
C |
![]() | GO TO STEP 16 |
|
3. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
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) Enter the following menus.
Powertrain > Engine > Utility
Tester Display |
---|
All Readiness |
(c) Input the DTC: P2A0026.
(d) Check the DTC judgment result.
Result | Proceed to |
---|---|
NORMAL (DTCs are not output) |
A |
ABNORMAL (DTC P2A0026 is output) |
B |
A |
![]() | END |
|
5. |
PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION) |
(a) Put the engine in Inspection Mode (Maintenance Mode).
Powertrain > Hybrid Control > Utility
Tester Display |
---|
Inspection Mode |
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT:
The A/C switch and all accessory switches should be off.
(c) Enter the following menus.
Powertrain > Engine > Active Test
Active Test Display |
---|
Control the EGR Step Position |
Data List Display |
---|
Intake Manifold Absolute Pressure |
Coolant Temperature |
Engine Independent |
(d) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.
NOTICE:
OK:
The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".
Standard:
- | EGR Step Position (Active Test) | |
---|---|---|
0 Steps | 0 to 30 Steps | |
Intake Manifold Absolute Pressure (Data List) |
(EGR valve is fully closed) |
Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed |
HINT:
OK | ![]() | GO TO STEP 16 |
|
6. |
INSPECT EGR VALVE ASSEMBLY |
(a) Remove the EGR valve assembly.
Click here
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
OK | ![]() | GO TO STEP 16 |
NG | ![]() | REPLACE EGR VALVE ASSEMBLY |
7. |
INSPECT AIR FUEL RATIO SENSOR (SENSOR 1) (HEATER RESISTANCE) |
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).
Click here
NG | ![]() | REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) |
|
8. |
CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks in the intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
NG | ![]() | REPAIR OR REPLACE INTAKE SYSTEM |
|
9. |
CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks.
HINT:
Perform "Inspection After Repair" after repairing or replacing the exhaust system.
Click here
NG | ![]() | REPAIR OR REPLACE EXHAUST SYSTEM |
|
10. |
PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION) |
(a) Put the engine in Inspection Mode (Maintenance Mode).
Powertrain > Hybrid Control > Utility
Tester Display |
---|
Inspection Mode |
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT:
The A/C switch and all accessory switches should be off.
(c) Enter the following menus.
Powertrain > Engine > Active Test
Active Test Display |
---|
Control the EGR Step Position |
Data List Display |
---|
Intake Manifold Absolute Pressure |
Coolant Temperature |
Engine Independent |
(d) Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.
NOTICE:
OK:
The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".
Standard:
- | EGR Step Position (Active Test) | |
---|---|---|
0 Steps | 0 to 30 Steps | |
Intake Manifold Absolute Pressure (Data List) |
(EGR valve is fully closed) |
Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed |
HINT:
OK | ![]() | GO TO STEP 12 |
|
11. |
INSPECT EGR VALVE ASSEMBLY |
(a) Remove the EGR valve assembly.
Click here
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
HINT:
Perform "Inspection After Repair" after replacing the EGR valve assembly.
Click here
NG | ![]() | REPLACE EGR VALVE ASSEMBLY |
|
12. |
CHECK FUEL PRESSURE (LOW PRESSURE SIDE) |
Click here
NG | ![]() | GO TO STEP 19 |
|
13. |
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:
Perform "Inspection After Repair" after replacing the port fuel injector assembly.
Click here
NG | ![]() | REPLACE PORT FUEL INJECTOR ASSEMBLY |
|
14. |
READ VALUE USING GTS (FUEL PRESSURE (HIGH)) |
(a) Put the engine in Inspection Mode (Maintenance Mode).
Powertrain > Hybrid Control > Utility
Tester Display |
---|
Inspection Mode |
(b) 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.
(c) Enter the following menus.
Powertrain > Engine > Data List
Tester Display |
---|
Engine Speed |
Coolant Temperature |
Fuel Pressure (High) |
Injection Mode |
(d) According to the display on the GTS, read the Data List.
HINT:
During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, read the Data List after charge control has completed.
Standard:
GTS Display | Condition |
Specified Condition |
---|---|---|
Fuel Pressure (High) |
| 3000 to 25000 kPag |
NG | ![]() | REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE) |
|
15. |
INSPECT DIRECT FUEL INJECTOR ASSEMBLY |
Click here
HINT:
Perform "Inspection After Repair" after replacing the direct fuel injector assembly.
Click here
NG | ![]() | REPLACE DIRECT FUEL INJECTOR ASSEMBLY |
|
16. |
REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) |
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).
Click here
|
17. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
18. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026) |
(a) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(b) Enter the following menus.
Powertrain > Engine > Utility
Tester Display |
---|
All Readiness |
(c) Input the DTC: P2A0026.
(d) Check the DTC judgment result.
Result | Proceed to |
---|---|
ABNORMAL (DTC P2A0026 is output) |
A |
NORMAL (DTCs are not output) |
B |
A |
![]() | REPLACE ECM |
B |
![]() | END |
19. |
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) |