| Case 1 |
DTC Strategy |
- Monitor the engine coolant temperature (signal stuck low)
|
- Poor connection or damaged harness
- Faulty ECT sensor
- Faulty cooling system
|
| Enable Condition |
- Engine coolant temperature is lower than 76°C (168.8°F)
- Battery voltage is between 6V and 16V
|
| Threshold Value |
- Measured ECT increase is less than 0.75°C (33.3°F) to 35°C (95°F)
|
| Case 2 |
DTC Strategy |
- Monitor the engine coolant temperature (signal stuck high)
|
| Enable Condition |
- Engine coolant temperature is greater than 76°C (168.8°F)
- Battery voltage is between 11V and 16V
- IAT at engine start is between -9.8°C (14.36°F) and 70°C (158°F)
- Ambient Air Temperature (AAT) is greater than -9.8°C (14.36°F)
- Part load driving condition: more than 250 to 500s (engine speed is higher than 1400 RPM and vehicle speed is higher than 35.4 km/h (22 mph) and mass air flow is higher than 5.5g/s)
- Low load driving condition: more than 200 to 400s (fuel cut off or idle with vehicle speed is higher than 19.3 km/h (12 mph))
|
| Threshold Value |
- ECT variation is lower than 2.25°C (36.05°F) since engine start
|
| Case 3 |
DTC Strategy |
- Monitor the engine coolant temperature (plausibility check)
|
| Enable Condition |
- Battery voltage is between 6V and 16V
- Engine stop time is more than 480m
- ECT decrease in 15s after start is less than 1°C (33.8°F)
|
| Threshold Value |
- Deviation between ECT and 2 other temperature sensors (IAT, AAT or EOT) is greater than 20°C (68°F) and deviation among other temperature sensors (IAT, AAT, EOT) is less than 20°C (68°F)
|
| Diagnostic Time |
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| MIL ON Condition |
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