| DTC Strategy |
Case 1 |
|
- Poor Connector Connection
- Open or Short in ECT Sensor Signal Circuit
- Open or Short in IAT Sensor Signal Circuit
- Faulty ECT Sensor
- Faulty IAT Sensor
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| Case 2 |
|
| Case 3 |
|
| Enable Condition |
Case 1 |
- ECT at engine start lower than 169°F (76°C)
- Battery voltage higher than 6V and lower than 16V
- No relevant DTC present
|
| Case 2 |
- ECT at engine start higher than or equal to 169°F (76°C)
- Battery voltage higher than 11V and lower than 16V
- IAT at engine start higher than 14°F (-10°C) and lower than 158°F (70° C)
- Ambient air temperature model higher than 14°F (-10°C)
- Part load driving condition (Engine speed higher than 1400 RPM & Vehicle Speed higher than 22 mph (35 km/h) & Mass air flow > 5.5g/s) for more than 250 to 500 s. depending on IAT
- Low load driving condition (Fuel cut off or idle with vehicle speed lower than 12 mph (19 km/h) for more than 200 to 400s depending on IAT
- No relevant DTC present
|
| Case 3 |
- Intake air temperature at engine start is between -30°C (-22°F) and 50° C (122°F)
- Engine stop time greater than 480min
- Battery voltage higher than 11V and lower than 16V
|
| Threshold Value |
Case 1 |
- When water Temperature is not changed comparing with it at the time of engine start
|
| Case 2 |
- ECT variation since engine start less than 4.05°F (2.25°C)
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| Case 3 |
- Deviation of ECT and 2 other (IAT, AAT) higher than 68°F (20°C)
- Deviation of among other temp. sensors (IAT, AAT) less than 68°F (20°C)
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| Diagnostic Time |
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| MIL ON Condition |
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