P0133
P0133, P0153 A/F Sensor 1Component Description
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sensor. The sensor element of the A/F sensor 1 is composed an electrode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement lambda = 1, but also in the lean and rich range.
Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide lambda range.
The exhaust gas components diffuse through the diffusion layer at the sensor cell. An electrode layer is applied voltage, and this current relative oxygen density in lean. Also this current relative hydrocarbon density in rich.
Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this electrode layer of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of about 800 °C (1,472 °F).
On Board Diagnosis Logic
To judge the malfunction of A/F sensor 1, this diagnosis measures response time of the A/F signal computed by ECM from the A/F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F signal cycling time index) is inordinately long or not.
P0133-P0153:
DTC Confirmation Procedure
NOTE: If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
WITH SDT
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Select "A/F SEN1(B1) P1278/P1279" (for DTC P0133) or "A/F SEN1(B2) P1288/P1289" (for DTC P0153) of "A/F SEN1" in "DTC work support" mode with SDT.
8. Touch "START".
If "COMPLETED" appears on SDT screen, go to step 10.
If "COMPLETED" does not appear on SDT screen, go to the following step.
9. After perform the following procedure, "TESTING" will be displayed on the SDT screen.
a. Increase the engine speed between 4,000 to 5,000 rpm and maintain that speed it for 10 seconds.
b. Fully release accelerator pedal and then let engine idle for about 10 seconds.
If "TESTING" is not displayed after 10 seconds.
10. Wait for about 20 seconds at idle under the condition that "TESTING" is displayed on the SDT screen.
11. Check that "TESTING" changes to "COMPLETED".
If "TESTING" changed to "OUT OF CONDITION".
12. Check that "OK" is displayed after touching "DTC check".
If "NG" is displayed, go to [P0133, P0153 A/F Sensor 1].
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Select Service $01 with GST.
3. Calculate the total value of "Short term fuel trim" and "Long term fuel trim" indications. Check that the total percentage should be within ±15%. If OK, go to the following step. If NG, check the following.
- Intake air leaks
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Fuel injector
- Incorrect PCV hose connection
- PCV valve
- Mass air flow sensor
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Turn ignition switch ON.
6. Turn ignition switch OFF and wait at least 10 seconds.
7. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
8. Let engine idle for 1 minute.
9. Increase the engine speed between 4,000 to 5,000 rpm and keep it for 10 seconds.
10. Fully release accelerator pedal and then let engine idle for about 1 minute.
11. Select Service $03 with GST and check that no DTC is displayed.
If the DTC is displayed, go to [P0133, P0153 A/F Sensor 1].
Diagnosis Procedure
Step 1-3:
Step 4-5:
Step 6-7:
