LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2021 >> Crosstrek Hybrid >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Control System (2.0L (Except For HEV)) (Diagnostics) (1 Of 4)) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0128: Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> General Description >> 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 SPECIFICATIONS

Malfunction Criteria Threshold Value
When any one of the followings is established:
<Judgment 1 >
Actual engine coolant temperature Less than 50°C (122°F)
Σ (Estimated engine coolant temperature - actual engine coolant temperature) More than value of Map 2
Estimated coolant temperature More than 50°C (122°F)
<Judgment 2 >
Actual engine coolant temperature Less than value of Map 1
Σ (Estimated engine coolant temperature - actual engine coolant temperature) More than value of Map 3
Estimated coolant temperature More than value of Map 4
<Judgment 3 >
Actual engine coolant temperature Less than 50°C (122°F)
TEMPERATURE SPECIFICATIONS - MAP 2

Engine coolant temperature at engine starting (°C (°F)) -7 (19.4) 0 (32) 8 (46.4) 10 (50) 30 (86) 40 (104)
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)
TEMPERATURE SPECIFICATIONS - MAP 3

Engine coolant temperature at engine starting (°C (°F)) -7 (19.4) 0 (32) 8 (46.4) 10 (50) 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)
TEMPERATURE SPECIFICATIONS - MAP 4

Engine coolant temperature at engine starting (°C (°F)) -7 (19.4) 8 (46.4) 10 (50) 25 (77)
Threshold Value (°C (°F)) 69.8 (157.6) 78.4 (173.1) 78.4 (173.1) 78.4 (173.1)

Time needed for diagnosis:  10000 ms

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.