CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03)
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)
PERFORM CONFIRMATION DRIVING PATTERN
CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)
PERFORM CONFIRMATION DRIVING PATTERN
CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03)
DTC P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)
DTC P2A03 A/F Sensor Circuit Slow Response (Bank 2 Sensor 1)
Description DTC P2A00 P2A03
HINT:
- DTC P2A00 indicates malfunctions related to the bank 1 A/F sensor.
- DTC P2A03 indicates malfunctions related to the bank 2 A/F sensor.
- Bank 1 refers to the bank that includes cylinder No. 1.
- Bank 2 refers to the bank that includes cylinder No. 2.
- Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.
| DTC Code | DTC Detection Condition | Trouble Area |
| P2A00 P2A03 | The calculated value for the air fuel ratio (A/F) sensor response rate deterioration level is less than threshold. |
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Confirmation driving pattern
HINT:
Performing this confirmation pattern will activate the A/F sensor response monitor.
- (a) Connect the intelligent tester to the DLC3.
- (b) Turn the ignition switch to ON.
- (c) Turn the intelligent tester on.
- (d) Clear DTCs .
- (e) Enter the following menus: Powertrain / Engine / Utility / Monitor Status.
- (f) Check that O2S (A/FS) Monitor is Incmpl.
- (g) Start the engine and warm it up.
- (h) Drive the vehicle at a constant speed between 40 km/h and 120 km/h (25 mph and 75 mph) for 3 minutes.
- (i) Check that O2S (A/FS) Monitor is Compl. If the Monitor Status is Incmpl, perform the driving pattern again increasing the vehicle speed and using second gear to decelerate the vehicle.
- (j) Enter the following menus: Powertrain / Engine / DTC / Pending.
- (k) Check if any DTCs (any pending DTCs) are stored.
Wiring diagram
Inspection procedure
HINT:
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F sensor function provided in the Active Test. The Control the Injection Volume for A/F sensor function can help to determine whether the Air Fuel Ratio (A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the Control the Injection Volume for A/F sensor operation using the intelligent tester.
- Connect the intelligent tester to the DLC3.
- Start the engine and turn the intelligent tester on.
- Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
- On the intelligent tester, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F sensor.
- Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume.)
- Monitor the output voltages of the A/F and HO2 sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the intelligent tester.
HINT:
- The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
| Tester Display (Sensor) | Injection Volume | Status | Voltage |
| AFS Voltage B1S1 or AFS Voltage B2S1 (A/F) | +25% | Rich | Less than 3.1 V |
| AFS Voltage B1S1 or AFS Voltage B2S1 (A/F) | -12.5% | Lean | More than 3.4 V |
| O2S B1S2 or O2S B2S2 (HO2) | +25% | Rich | More than 0.55 V |
| O2S B1S2 or O2S B2S2 (HO2) | -12.5% | Lean | Less than 0.4 V |
NOTICE:
The Air Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) sensor has a maximum output delay of approximately 20 seconds.
| Case | A/F Sensor (Sensor 1) Output Voltage | HO2 Sensor (Sensor 2) Output Voltage | Main Suspected Trouble Area |
| 1 |   |
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| 2 |  |
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| 3 | |
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| 4 | |
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- Following the Control the Injection Volume for A/F sensor procedure enables technicians to check and graph the voltage outputs of both the A/F and HO2 sensors.
- To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2.
HINT:
- DTC P2A00 or P2A03 may be also stored, when the air fuel ratio is stuck rich or lean.
- A low A/F sensor voltage could be caused by a rich air-fuel mixture. Check for conditions that would cause the engine to run rich.
- A high A/F sensor voltage could be caused by a lean air-fuel mixture. Check for conditions that would cause the engine to run lean.
- 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.
| 1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03) |
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Connect the intelligent tester to the DLC3.
-
Turn the ignition switch to ON.
-
Turn the intelligent tester on.
-
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
-
Read DTCs.
Result Display (DTC Output) Proceed to P2A00 and/or P2A03 A P2A00 and/or P2A03 and other DTCs B HINT:
If any DTCs other than P2A00 or P2A03 are output, troubleshoot those DTCs first.
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| A | |
| 2.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) |
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Disconnect the Air Fuel ratio (A/F) sensor connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for Bank 1 Sensor 1 Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ? 1 (HA1A) - 4 (A1A-) Always 10 k? or higher for Bank 2 Sensor 1 Tester Connection Condition Specified Condition 1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ? 1 (HA2A) - 4 (A2A-) Always 10 k? or higher
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| OK | |
| 3.CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) |
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Disconnect the ECM connector.
-
Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
for LHD Tester Connection Condition Specified Condition C22-1 (HA1A) - C45-86 (HA1A) Always Below 1 ? C23-1 (HA2A) - C45-109 (HA2A) Always Below 1 ? for RHD Tester Connection Condition Specified Condition C22-1 (HA1A) - C46-86 (HA1A) Always Below 1 ? C23-1 (HA2A) - C46-109 (HA2A) Always Below 1 ? Standard Resistance (Check for Short):
for LHD Tester Connection Condition Specified Condition C22-1 (HA1A) or C45-86 (HA1A) - Body ground Always 10 k? or higher C23-1 (HA2A) or C45-109 (HA2A) - Body ground Always 10 k? or higher for RHD Tester Connection Condition Specified Condition C22-1 (HA1A) or C46-86 (HA1A) - Body ground Always 10 k? or higher C23-1 (HA2A) or C46-109 (HA2A) - Body ground Always 10 k? or higher
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| OK | |
| 4.PERFORM CONFIRMATION DRIVING PATTERN |
| NEXT | |
| 5.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03) |
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Connect the intelligent tester to the DLC3.
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Turn the ignition switch to ON and turn the intelligent tester on.
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Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
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Read DTCs.
Result Display (DTC Output) Proceed to P2A00 and/or P2A03 A No output B
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| A | |
| 6.REPLACE AIR FUEL RATIO SENSOR |
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Replace the air fuel ratio sensor .
| NEXT | |
| 7.PERFORM CONFIRMATION DRIVING PATTERN |
| NEXT | |
| 8.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03) |
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Connect the intelligent tester to the DLC3.
-
Turn the ignition switch to ON and turn the intelligent tester on.
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Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
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Read DTCs.
Result Display (DTC Output) Proceed to No output A P2A00 and/or P2A03 B
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| A | |
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