Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
3Zr-Fae Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00)
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
PERFORM CONFIRMATION DRIVING PATTERN
CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)
PERFORM CONFIRMATION DRIVING PATTERN
CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00)
DTC P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1) |
DESCRIPTION
- HINT:
- Sensor 1 refers to the sensor mounted in front of the Three Way Catalytic Converter (TWC) and located near the engine assembly.
| DTC No. | DTC Detection Condition | Trouble Area |
| P2A00 | The calculated value of the air fuel ratio sensor response rate deterioration level is less than the threshold (2 trip detection logic). |
|
CONFIRMATION DRIVING PATTERN
- HINT:
- Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.
- Connect the intelligent tester to the DLC3.
- Turn the ignition switch to ON.
- Turn the tester on.
- Enter the following menus: Powertrain / Engine and ECT / DTC / Clear.
- Clear the DTCs.
- Start the engine and warm it up. (Procedure "A")
- Drive the vehicle at a constant speed between 64 km/h and 120 km/h (40 mph and 75 mph) for 3 minutes or more. (Procedure "B")
- Turn the ignition switch off.
- Repeat Procedure "A" and "B" above again.
- Enter the following menus: Powertrain / Engine and ECT / DTC.
- Check if any DTCs (any pending DTCs) are output.
WIRING DIAGRAM
Refer to DTC P2195 (RAV4_ACA30 RM000000WC40NNX_07.html).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 tester on.
- Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
- 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 B1 S1 and O2S B1 S2) displayed on the tester.
- HINT:
- The Control the Injection Volume for A/F sensor operation decreases 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 B1 S1 (A/F) | +25% | Rich | Below 3.1 V |
| AFS Voltage B1 S1 (A/F) | -12.5% | Lean | Higher than 3.4 V |
| O2S B1 S2 (HO2) | +25% | Rich | Higher than 0.55 V |
| O2S B1 S2 (HO2) | -12.5% | Lean | Below 0.4 V |
- NOTICE:
- The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen 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 |   |  | - |
| 2 |  | |
|
| 3 | | |
|
| 4 | | |
|
- 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 / AFS Voltage B1 S1 and O2S B1 S2.
- HINT:
- DTC P2A00 may be stored when the air fuel ratio is stuck rich or lean.
- A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
- A high air fuel ratio 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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Result Result Proceed to DTC P2A00 is output A DTC P2A00 and other DTCs are output B - HINT:
- If any DTCs relating to the A/F sensor (DTCs for the A/F sensor heater or A/F sensor admittance) are output, troubleshoot those DTCs first.
|
| ||||
| A | |
| 2.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) |
Disconnect the air fuel ratio sensor connector.
 |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω 1 (HA1A) - 4 (A1A-) Always 10 kΩ or higher
Text in Illustration *1 Component without harness connected
(Air Fuel Ratio Sensor)
Reconnect the air fuel ratio sensor connector.
|
| ||||
| OK | |
| 3.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) |
Disconnect the air fuel ratio sensor connector.
 |
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition B113-2 (+B) - Body ground Ignition switch ON 11 to 14 V
Turn the ignition switch off.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection Condition Specified Condition B113-3 (A1A+) - B32-103 (A1A+) Always Below 1 Ω B113-4 (A1A-) - B32-126 (A1A-) Always Below 1 Ω B113-1 (HA1A) - B32-104 (HA1A) Always Below 1 Ω
- Standard Resistance (Check for Short):
Tester Connection Condition Specified Condition B113-3 (A1A+) or B32-103 (A1A+) - Body ground Always 10 kΩ or higher B113-4 (A1A-) or B32-126 (A1A-) - Body ground Always 10 kΩ or higher B113-1 (HA1A) or B32-104 (HA1A) - Body ground Always 10 kΩ or higher
Text in Illustration *1 Front view of wire harness connector
(to Air Fuel Ratio Sensor)*2 Front view of wire harness connector
(to ECM)
Reconnect the ECM connector.
Reconnect the air fuel ratio sensor connector.
|
| ||||
| OK | |
| 4.PERFORM CONFIRMATION DRIVING PATTERN |
| NEXT | |
| 5.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Result Result Proceed to DTC P2A00 is output A DTC is not output B
|
| ||||
| A | |
| 6.REPLACE AIR FUEL RATIO SENSOR |
Replace the air fuel ratio sensor (RAV4_ACA30 RM000002WUR027X.html).
| NEXT | |
| 7.PERFORM CONFIRMATION DRIVING PATTERN |
| NEXT | |
| 8.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Result Result Proceed to DTC is not output A DTC P2A00 is output B
|
| ||||
| A | ||
| ||