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Home >> Subaru >> 2005 >> Forester XT, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0181 Fuel Temperature Sensor "A" Circuit Range/Performance >> Diagnostic Method
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Diagnostic Method

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 120 seconds.

Judgment Value 

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Fuel level >/= 10 l (2.64 US gal, 2.20 lmp gal)
After engine starting 20 seconds or more
Engine coolant temperature - engine coolant temperature at engine starting > 10°C (18°F)
Fuel temperature - engine coolant temperature >/= 10°C (18°F)
Battery voltage > 10.9 V

Time Needed for Diagnosis:  120 seconds

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

Judge OK when the malfunction criteria below are completed.

Judgment Value 

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Fuel level >/=10 l (2.64 US gal, 2.20 lmp gal)
After engine starting 20 seconds or more
Engine coolant temperature - engine coolant temperature at engine starting >10°C (18°F)
Fuel temperature - engine coolant temperature <10°C (18°F)
Battery voltage > 10.9 V
Engine coolant temperature <70°C (158°F)

If the fuel temperature which might rise along with the engine idling (the cumulative amount of intake air after engine starting is large) does not increase, the engine is considered to be stuck and make an NG judgment.



Judge NG when the malfunction criteria below are completed.

Judgment Value 

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Accumulated amount of intake air >/= 550 kg (1212.8 lb)
Fuel temperature difference between Max. and Min. < 3°C (5.4°F)

Time Needed for Diagnosis:  To be determined.

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

Judge OK when the malfunction criteria below are completed.

Judgment Value 

JUDGMENT VALUE

Malfunction Criteria Threshold Value
Accumulated amount of intake air >/= 550 kg (1212.8 lb)
Fuel temperature difference between Max. and Min. >/= 3°C (5.4°F)