Subaru 2009 IMPREZA Service Manual page 1755

Diagnostic Trouble Code (DTC) Detecting Criteria
CK:DTC P0852 PARK/NEUTRAL SWITCH INPUT CIRCUIT HIGH (AT MODEL)
1. OUTLINE OF DIAGNOSIS
Judge the open or short circuit of the neutral SW.
Judge as NG when the ECM neutral terminal input differs from the reception data from TCM.
2. ENABLE CONDITIONS
Secondary Parameters
Battery voltage
Starter relay
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 2 seconds after starting the engine.
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.
Judgement Value
Malfunction Criteria
Neutral switch signal in ECM when "P"/
"N" range in TCM are "ON" and when the
other switches are "OFF"
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.
Judgement Value
Malfunction Criteria
Neutral switch signal in ECM when "P"/
"N" range in TCM are "ON" and when the
other switches are "OFF"
Time Needed for Diagnosis: Less than 1 second
Enable Condition
10.9 V
OFF
Threshold Value
HIGH (OFF)
Threshold Value
LOW (ON)
GD(H4DOTC)-167
GENERAL DESCRIPTION