Thermostat Monitor
Operation
THERMOSTAT MONITOR OPERATION
| DTCs | P0128 |
| Monitor execution | Once per driving cycle |
| Sensors / components OK | MAF, ECT, VSS, IAT, Barometric pressure, Back-up power |
| Monitoring Duration | Within 15 min. |
Enable conditions
THERMOSTAT MONITOR ENABLE CONDITIONS
| Parameter | Minimum | Maximum |
|---|---|---|
| Engine coolant temp. at engine start | -8 (18) °C (°F) | 65 (149) °C (°F) |
| Engine warm up counter | 2048 count | |
| Low engine load counter | 500 s | |
| High engine load counter | 70 s | |
| Time from engine start | 900 s | |
| IAT | -8 (17.6) °C (°F) | |
| Barometric pressure | 74.5 kPa |
Typical malfunction thresholds
THERMOSTAT MONITOR TYPICAL MALFUNCTION THRESHOLDS
| Engine coolant temp. < 75 (167) °C (°F) |