CHECK OTHER DTC OUTPUT (BESIDES A/F SENSOR DTC)
INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
CHECK WIRE HARNESS (A/F SENSOR - ECM)
PERFORM CONFIRMATION DRIVING PATTERN
CHECK WHETHER DTC OUTPUT RECURS (P2A00, P2A03)
PERFORM CONFIRMATION DRIVING PATTERN
CHECK WHETHER DTC OUTPUT RECURS (P2A00, 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
Refer to DTC P2195 (Toyota Fortuner RM000000WC4011X.html).| DTC No. | DTC Detection Condition | Trouble Area |
| P2A00 P2A03 | Calculated test value for A/F sensor response rate deterioration level is less threshold |
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WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Intelligent tester only:
- Malfunctioning areas can found by performing the Active Test / Control the Injection volume for A/F sensor operation. The "Control the injection volume for A/F sensor" operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.
- HINT:
- "Control the injection volume for A/F sensor" is an Active Test which changes the injection volume to -12.5% or +25%.
- Connect the intelligent tester to the DLC3.
- Start the engine and turn the tester ON.
- Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
- Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the injection volume for A/F sensor.
- Enter the following monitor items: AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2.
- Perform the "Control the injection volume for A/F sensor" operation with the engine in a idling condition (press the right or left button).
- 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 B1S1 or AFS B2S1 (A/F) | +25 % | Rich | Less than 3.0 |
| AFS B1S1 or AFS B2S1 (A/F) | -12.5 % | Lean | More than 3.35 |
| O2S B1S2 or O2S B2S2 (heated oxygen sensor) | +25 % | Rich | More than 0.55 |
| O2S B1S2 or O2S B2S2 (heated oxygen sensor) | -12.5 % | Lean | Less than 0.4 |
- NOTICE:
- The A/F 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 | Heated Oxygen Sensor (Sensor 2) Output Voltage | Main Suspected Trouble Areas | ||
| 1 | Injection volume +25 % -12.5 % |  | Injection volume +25 % -12.5 % | | - |
| Output voltage More than 3.35 V Less than 3.0 V |  | Output voltage More than 0.55 V Less than 0.4 V |  | ||
| 2 | Injection volume +25 % -12.5 % | | Injection volume +25 % -12.5 % | |
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| Output voltage Almost no reaction |  | Output voltage More than 0.55 V Less than 0.4 V | | ||
| 3 | Injection volume +25 % -12.5 % | | Injection volume +25 % -12.5 % | |
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| Output voltage More than 3.35 V Less than 3.0 V | | Output voltage Almost no reaction | | ||
| 4 | Injection volume +25 % -12.5 % | | Injection volume +25 % -12.5 % | |
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| Output voltage Almost no reaction | | Output voltage Almost no reaction | | ||
- Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the A/F and heated oxygen sensors.
- Enter the following menus on the tester: Powertrain / Engine and ECT / Active Test / Control the injection volume for A/F sensor and Data List / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2.
- HINT:
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
- These DTCs are related to the A/F sensor.
- These DTCs are recorded when the A/F sensor has malfunction, although the caption is oxygen sensor.
| 1.CHECK OTHER DTC OUTPUT (BESIDES A/F SENSOR DTC) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read DTCs.
- Result:
Display Proceed to DTC P2A00 and/or P2A03 are output A DTC P2A00 and/or P2A03 and other codes are output B
- HINT:
- If any other code besides P2A00 and/or P2A03 are output, perform troubleshooting for those DTCs first.
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| A | |
| 2.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) |
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Disconnect the A30 and A31 A/F sensor connectors.
Measure the resistance of the A/F sensor.
- Standard resistance:
Bank 1 Sensor 1 Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω 1 (HA1A) - 4 (A1A-) - 10 kΩ or higher Bank 2 Sensor 1 Tester Connection Condition Specified Condition 1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω 1 (HA2A) - 4 (A2A-) - 10 kΩ or higher
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| OK | |
| 3.CHECK WIRE HARNESS (A/F SENSOR - ECM) |
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Disconnect the A30 or A31 A/F sensor connectors.
Disconnect the E6 ECM connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Bank 1 Sensor 1 Terminal Connection Specified Condition A30-1 (HA1A) - E16-2 (HA1A) Below 1 Ω A30-3 (A1A+) - E16-22 (A1A+) Below 1 Ω A30-4 (A1A-) - E16-30 (A1A-) Below 1 Ω A30-1 (HA1A) or E16-2 (HA1A) - Body ground 10 kΩ or higher A30-3 (A1A+) or E16-22 (A1A+) - Body ground 10 kΩ or higher A30-4 (A1A-) or E16-30 (A1A-) - Body ground 10 kΩ or higher Bank 2 Sensor 1 Terminal Connection Specified Condition A31-1 (HA2A) - E16-1 (HA2A) Below 1 Ω A31-3 (A2A+) - E16-23 (A2A+) Below 1 Ω A31-4 (A2A-) - E16-31 (A2A-) Below 1 Ω A31-1 (HA1A) or E16-1 (HA2A) - Body ground 10 kΩ or higher A31-3 (A2A+) or E16-23 (A2A+) - Body ground 10 kΩ or higher A31-4 (A2A-) or E16-31 (A2A-) - Body ground 10 kΩ or higher
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| OK | |
| 4.PERFORM CONFIRMATION DRIVING PATTERN |
| NEXT | |
| 5.CHECK WHETHER DTC OUTPUT RECURS (P2A00, P2A03) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read DTCs.
- Result:
Display Proceed to DTC P2A00 and/or P2A03 are not output A DTC P2A00 and/or P2A03 are output B
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| A | |
| 6.REPLACE AIR FUEL RATIO SENSOR |
| NEXT | |
| 7.PERFORM CONFIRMATION DRIVING PATTERN |
| NEXT | |
| 8.CHECK WHETHER DTC OUTPUT RECURS (P2A00, P2A03) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read DTCs.
- Result:
Display Proceed to DTC P2A00 and/or P2A03 are not output A DTC P2A00 and/or P2A03 are output B
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| B | ||
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