Subaru 2009 IMPREZA Service Manual page 862

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BT:DTC P0500 VEHICLE SPEED SENSOR "A"
1. OUTLINE OF DIAGNOSIS
Judge as NG when outside of the judgement value.
Judge NG when the received data from ABSCM&H/U is abnormal vehicle speed, and the vehicle speed data
is impossible.
2. COMPONENT DESCRIPTION
Vehicle speed signals are taken in to the ABS control module and hydraulic control unit, and normal/errone-
ous data of the ABS wheel speed sensor is received by CAN communication from the ABS control module
and hydraulic control unit.
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
Elapsed time after engine starting
4. GENERAL DRIVING CYCLE
Always perform diagnosis more than 2000 ms after starting the engine.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Front ABS wheel speed sensor status
Either of the following is established
Front left wheel speed
Front right wheel speed
Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
Front left wheel speed
Front right wheel speed
Time Needed for Diagnosis: 2500 ms
Enable Conditions
10.9 V
2000 ms
Threshold Value
Malfunction
300 km/h (186.4 MPH)
300 km/h (186.4 MPH)
Threshold Value
> 0 km/h (0 MPH)
and
< 300 km/h (186.4 MPH)
> 0 km/h (0 MPH)
and
< 300 km/h (186.4 MPH)
GD(H4SO)-138