Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Method
- Abnormality Judgment
Judge as NG when Low side or High side becomes NG.
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
| Malfunction Criteria | Threshold Value |
|---|---|
| Low | |
| Output voltage | < 1.22 V |
| Engine speed | ≥ 1500 rpm |
| Throttle opening angle | ≥ 12 ° |
| Intake manifold pressure | ≥ 73.3 kPa (550 mmHg, 21.7 inHg) |
| High (1) | |
| Output voltage | ≥ 2.1 V |
| Engine speed | 525 rpm - 900 rpm |
| Throttle opening angle | < 5.7 ° |
| Intake manifold pressure | ≥ 58.7 kPa (440 mmHg, 17.3 inHg) |
| High (2) | |
| Output voltage | ≥ 2.1 V |
| Engine speed | 525 rpm - 900 rpm |
| Throttle opening angle | < 5.7 ° |
| Intake manifold pressure | ≥ 58.7 kPa (440 mmHg, 17.3 inHg) |
| Fuel system diagnosis | Rich side malfunction |
Time Needed for Diagnosis:
Low: 5000 ms
High: 10000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG when both Low side and High side become OK.
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
| Malfunction Criteria | Threshold Value |
|---|---|
| Low | |
| Output voltage | ≥ 1.22 V |
| Engine speed | ≥ 1500 rpm |
| Throttle opening angle | ≥ 12 ° |
| Intake manifold pressure | ≥ 73.3 kPa (550 mmHg, 21.7 inHg) |
| High | |
| Output voltage | < 2.1 V |
| Engine speed | 525 rpm - 900 rpm |
| Throttle opening angle | < 5.7 ° |
| Intake manifold pressure | < 58.7 kPa (440 mmHg, 17.3 inHg) |
| Fuel system diagnosis | Rich side normal |
Time Needed for Diagnosis:
Low: Less than 1 second
High: Less than 1 second
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.