Subaru 2009 IMPREZA Service Manual page 797

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Diagnostic Trouble Code (DTC) Detecting Criteria

After engine start oil temperature sensor characteristic diagnosis timer (timer for diagnosis).

a. Timer stop at fuel cut

b. During the driving conditions except a) above, timer counts up as follows.

64 milliseconds + TOILCNT milliseconds (at the time of 64 milliseconds).

Where, TOILCNT is determined as follows,

TOILCNT = 0 at idle switch ON

For TOILCNT at Idle switch off, refer to the following table.

After engine start oil temperature characteristic diagnosis timer judgement value (t).

t = 1882940 ms – 43302 ms × Ti (t

Ti = The lowest coolant temperature after starting the engine.

Time Needed for Diagnosis: Less than 1 second

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-

• Normality Judgement

Judge as OK and clear the NG if the following conditions are established.

Judgement Value

Malfunction Criteria

Engine oil temperature

Time Needed for Diagnosis: Less than 1 second

Threshold Value

15 °C (59 °F)

Vehicle speed km/h (MPH)

GENERAL DESCRIPTION