Secondary Coolant Temp Rise Monitoring
The 6.7L engine has a secondary coolant loop with two thermostats, a 20C thermostat for the charge air cooler and fuel cooler, and a 45C thermostat for the EGR cooler and trans cooler. System schematic below
The rise check to detect a stuck ECT2 sensor is identical in function to the rise check used for the primary coolant loop. A minimum rise is expected over a calibratable amount of time,
ECT2 RISE MONITOR
| DTCs | P2183 - Engine Coolant Temperature Sensor 2 Circuit Range/Performance |
| Monitor Execution | Once per trip |
| Monitor Sequence | None |
| Sensors OK | ECT2 |
| Typical Monitoring Duration | 5750 sec at -35C, 200 at 25C |
TYPICAL ECT2 RISE MONITOR ENTRY CONDITIONS
| Entry Condition | Minimum | Maximum |
| ECT2 | -35 deg C | 45 deg C |
| Torque | 0 Nm | 2000 Nm |
| Engine Speed | 400 rpm |
TYPICAL ECT2 DYNAMIC MONITOR MALFUNCTION THRESHOLDS
| within the time duration, must reach 25C |