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
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
| Malfunction Criteria | Threshold Value |
|---|---|
| Engine coolant temperature | < -15 °C (5 °F) |
| Elapsed time after starting the engine (When (Smaller value either engine coolant temperature or intake air temperature at engine start) ≥ -23.3°C (-9.9°F)) | ≥ Value of Map 1 |
| or | |
| Elapsed time after starting the engine (When (Smaller value either engine coolant temperature or intake air temperature at engine start) < -23.3°C (-9.9°F)) | ≥ Value from Map 2 |
| Smaller value either engine coolant temperature or intake air temperature at engine start °C (°F) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| -40 (-40) | -23.4 (-10.1) | -23.3 (-9.9) | 0 (32) | 20 (68) | 40 (104) | 60 (140) | 80 (176) | ||
| Ratio of time at engine stop during elapsed time after engine start | 0.0 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 |
| 0.3 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 | |
| 0.6 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 | |
| 1.0 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 | |
| ms | |||||||||
| Smaller value either engine coolant temperature or intake air temperature at engine start °C (°F) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| -40 (-40) | -23.4 (-10.1) | -23.3 (-9.9) | 0 (32) | 20 (68) | 40 (104) | 60 (140) | 80 (176) | ||
| Ratio of time at engine stop during elapsed time after engine start | 0.0 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 |
| 0.3 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 | |
| 0.6 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 | |
| 1.0 | 300000 | 300000 | 120000 | 120000 | 120000 | 120000 | 120000 | 120000 | |
| ms | |||||||||
Time Needed for Diagnosis: 64 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
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 |
|---|---|
| Engine coolant temperature | ≥ -15 °C (5 °F) |
Time Needed for Diagnosis: 64 ms
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.