Subaru Legacy IV (2008 year). Manual - part 428
GD(H4DOTC)-162
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CK:DTC P0851 PARK/NEUTRAL SWITCH INPUT CIRCUIT LOW (AT MODEL)
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of neutral SW.
Judge as NG when the neutral terminal input in ECM differs from the received data from TCM.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after two seconds have passed since the engine started.
4. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Time Needed for Diagnosis: 100 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• 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.
Time Needed for Diagnosis: Less than 1 second
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Starter relay
OFF
Judgement Value
Malfunction Criteria
Threshold Value
Neutral switch signal in ECM when “P”/
“N” range in TCM are “OFF” and when
the other switches are “ON”
LOW (ON)
Judgement Value
Malfunction Criteria
Threshold Value
Neutral switch signal in ECM when “P”/
“N” range in TCM are “OFF” and when
the other switches are “ON”
HIGH (OFF)