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Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 127 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4DO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0128 Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
JUDGMENT VALUE REFERENCE CHART

Malfunction Criteria Threshold Value
When any one of the followings is established.  
  • Actual engine coolant temperature (Judgement 1)
< Value of Map 3
  • Actual engine coolant temperature (Judgement 2)
< (regulated temperature or alternative threshold value) -11.1°C (20°F)
  • Estimated engine coolant temperature - actual engine coolant temperature (Judgement 3)
> Value of Map 4
ENABLE CONDITION REFERENCE CHART

Estimate ambient temperature °C (°F) -7 (19.4) 0 (32) 8 (46.4) 25 (77)
Actual engine coolant temperature °C (°F) 60.9 (141.6) 60.9 (141.6) 75 (167) 75 (167)
ENABLE CONDITION REFERENCE CHART

Estimate ambient temperature °C (°F) -7 (19.4) 0 (32) 8 (46.4) 25 (77)
Estimated engine coolant temperature - actual engine coolant temperature °C (°F) 19 (34.2) 19 (34.2) 19 (34.2) 19 (34.2)

Time Needed for Diagnosis:  16 - 30 seconds

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

JUDGMENT VALUE REFERENCE CHART

Malfunction Criteria Threshold Value
All of the following conditions are established.  
  • Engine coolant temperature at engine starting
< 58.5°C (137.3 °F)
  • Actual engine coolant temperature
> Value of Map 3 >
  • Actual engine coolant temperature
(regulated temperature or alternative threshold value) - 11.1°C (20°F)
  • Estimated engine coolant temperature - actual engine coolant temperature
< Value of Map 4

Time Needed for Diagnosis:  Less than 1 second