| Case 1 |
DTC Strategy |
- Rationality low side check.
|
- Poor connection
- Engine Coolant Temperature Sensor (ECTS)
|
| Enable Conditions |
- No block heater detection.
- ECTS at engine start-up less than 50°C (122°F).
- Time after engine start-up less than 30 seconds.
- Difference of ECT and ECT at engine start-up less than -2.25°C/27.95°F (or integrated air mass greater than 0.2 kg).
- Integration of ECT deviation (Difference of ECT and ECT at start-up) less than 10°C (50°F).
|
| Threshold Value |
- Difference of ECT and Model ECT (low side) less than -10.5°C (13.1°F).
|
| Diagnostic Time |
|
| Case 2 |
DTC Strategy |
- Rationality high side check.
|
| Enable Conditions |
- Integrated air mass greater than 1.0 kg.
- ECT greater than 84.8 °C (184.6 °F).
|
| Threshold Value |
- Difference of ECT and Model ECT (high side) greater than 10°C (50°F).
|
| Diagnostic Time |
|
| Case 3 |
DTC Strategy |
- Rationality check (ECT stuck signal)
|
| Enable Conditions |
- ECT at start-up less than 75°C (167°F).
- (A) Vehicle speed less than 4 mph (6.4 km/h).
- (B) Air mass flow less than 30 kgh.
- Total sum of (A) and (B) for 18 seconds greater than or equal to 2 times.
- (C) Vehicle speed less than 25 mph (40.2 km/h).
- (D) Air mass flow greater than 30 kg/h less than 500 kg/h.
- Total sum of (C) and (D) for 18 seconds equal to or greater than 2 times.
|
| Threshold Value |
- Difference of Max ECT and Min ECT less than 0.8 ~ 3.0°C (33.44 ~ 37.4°F).
|
| Diagnostic Time |
|
| MIL ON Condition |
|