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Home >> Subaru >> 2016 >> WRX Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria) >> 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 variant/trim than selected.

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
When any one of the followings is established:
< Judgment 1 >
Actual engine coolant temperature < Value of Map 4
and  
Σ (Estimated engine coolant temperature - actual engine coolant temperature) > Value of Map 5
< Judgment 2 >
Actual engine coolant temperature < Regulated temperature - Value of Map 6
and  
Σ (Estimated engine coolant temperature - actual engine coolant temperature) > Value of Map 7
< Judgment 3 >
Estimated engine coolant temperature - actual engine coolant temperature > Value of Map 8
and  
Σ (Estimated engine coolant temperature - actual engine coolant temperature) > Value of Map 9
TEMPERATURE SPECIFICATION - MAP 4

Estimate ambient temperature °C (°F) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Threshold Value °C (°F) 70 (158) 70 (158) 70 (158) 70 (158)
TEMPERATURE SPECIFICATION - MAP 5

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 0 (32) 8 (46.4) 10 (50) 25 (77) 35 (95)
Threshold Value °C (°F) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1200 (1800)
TEMPERATURE SPECIFICATION - MAP 6

Estimate ambient temperature °C (°F) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Threshold Value °C (°F) 11.1 (20) 11.1 (20) 11.1 (20) 11.1 (20)
TEMPERATURE SPECIFICATION - MAP 7

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 0 (32) 8 (46.4) 10 (50) 25 (77) 30 (86) 35 (95)
Threshold Value °C (°F) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1200 (2160)
TEMPERATURE SPECIFICATION - MAP 8

Estimate ambient temperature °C (°F) -7 (19.4) 8 (46.4) 18 (50) 25 (77)
Threshold Value °C (°F) 11.1 (20) 11.1 (20) 11.1 (20) 11.1 (20)
TEMPERATURE SPECIFICATION - MAP 9

Engine coolant temperature at engine starting °C (°F) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Threshold Value °C (°F) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9) 1731.6 (3116.9)

Time Needed for Diagnosis:  300 - 700 seconds

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