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
- Exhaust temperature diagnosis
Abnormality Judgment
When the diagnostic execution conditions are established, calculate the estimated exhaust temperature. Judge as NG when the following conditions are established after engine starting within the predetermined time.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Estimated exhaust gas temperature | < Value from Map |
Map (PZEV model)
| Coolant temperature after starting the engine | -40°C (-40°F) | -30°C (-22°F) | -20°C (-4°F) | -10°C (14°F) | 0°C (32°F) | 10°C (50°F) | 20°C (68°F) | 30°C (86°F) | 40°C (104°F) | 50°C (122°F) |
| Threshold value (AT model) | 140°C (284°F) | 140°C (284°F) | 140°C (284°F) | 140°C (284°F) | 140°C (284°F) | 138°C (280.4°F) | 138°C (280.4°F) | 138°C (280.4°F) | 138°C (280.4°F) | 138°C (280.4°F) |
| Threshold value (MT model) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 160°C (320°F) | 145°C (293°F) | 145°C (293°F) |
Map (except for PZEV model)
| Coolant temperature after starting the engine | -40°C (-40°F) | -30°C (-22°F) | -20°C (-4°F) | -10°C (14°F) | 0°C (32°F) | 10°C (50°F) | 20°C (68°F) | 30°C (86°F) | 40°C (104°F) | 50°C (122°F) |
| Threshold value (AT model) | 140°C (284°F) | 140°C (284°F) | 140°C (284°F) | 140°C (284°F) | 140°C (284°F) | 140°C (284°F) | 135°C (275°F) | 130°C (266°F) | 125°C (257°F) | 125°C (257°F) |
| Threshold value (MT model) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 168°C (334.4°F) | 160°C (320°F) | 145°C (293°F) | 145°C (293°F) |
Time Needed for Diagnosis: 14 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Estimated exhaust gas temperature | ≥ Value from Map |
Time Needed for Diagnosis: Less than 1 second
- Idle speed diagnosis
Abnormality Judgment
Judge as NG when the following conditions are established after the predetermined time.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Continuous time of (Target engine speed - Actual engine speed > -300 RPM) | ≥ 6000 ms |
| Continuous time of (actual retard amount > 30°CA) | ≥ 0 ms |
Time Needed for Diagnosis: 14 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
Normality Judgment
Judge as OK and clear the NG if the following conditions are established.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Continuous time of (Target engine speed - Actual engine speed > -300 RPM) | < 6000 ms |
| Continuous time of (actual retard amount > 30°CA) | <0ms |
Time Needed for Diagnosis: Less than 1 second
- Final ignition timing diagnosis
Abnormality Judgment
Judge as NG when the following conditions are established with diagnosis enable conditions successful.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Duration time of (Standard ignition timing - Actual ignition timing ≤ 0°CA) | > 5000 ms |
Time Needed for Diagnosis: 5000 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 following conditions are established.
Judgment Value
| Malfunction Criteria | Threshold Value |
|---|---|
| Duration time of (Standard ignition timing - Actual ignition timing > 0°CA) | > 1000 ms |
Time Needed for Diagnosis: 1000 ms
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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.
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