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Home >> Toyota >> 2004 >> Prius >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (SFI) - Diagnosis >> DTC P1116: Coolant Temperature Sensor Circuit Stack For Coolant Heat Storage System >> Monitor Strategy
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Monitor Strategy

Fig 1: DTC P1116 Monitor Strategy Table
G02917280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TYPICAL ENABLING CONDITIONS (DTC P1116)

The monitor will run whenever the following DTCs are not present See LIST OF DISABLE A MONITOR 
Coolant heat storage system malfunction Not detected
Coolant heat recovering ON
Difference between engine coolant temperature and CHS tank outlet temperature More than 30° C (54 °F)
TYPICAL MALFUNCTION THRESHOLDS (DTC P1116)

Temperature variation of CHS tank outlet during hot coolant recovery 1°C or less
Difference between temperatures of CHS tank outlet and engine coolant during hot coolant recovery More than 25° C (45 °F)