Subaru LEGACY 2006 Manual page 619

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CJ:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW (MT MODEL)
1. OUTLINE OF DIAGNOSIS
Judge the open or short circuit of the neutral SW.
Judge as NG when there is no change in the neutral SW even if the driving shift was applied. (There is neutral
SW ON/OFF inversion from the vehicle speed and engine speed.)
2. ENABLE CONDITION
Secondary Parameters
Ignition switch
Battery voltage
After engine starting
Starter switch
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 2 seconds after starting the engine.
4. DIAGNOSTIC METHOD
Judge as NG when the malfunction criteria below are completed 3 time or more after the neutral SW change.
Judge as OK and clear the NG when there is change in the neutral SW.
Judgment Value
Malfunction Criteria
Neutral switch signal (while changing
from a to b below)
Driving condition change
a) Vehicle speed = 0 km/h (0 MPH) &
engine speed 600 — 900 rpm
b) Vehicle speed ≥ 64 km/h (40 MPH) &
engine speed 1600 — 2550 rpm
Time Needed for Diagnosis: Monitoring 3 times
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
5. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
• When the OK driving cycle is completed 3 times in a row
• When "Clear Memory" is performed
7. FAIL SAFE
Control of cruise control: Control prohibited
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Enable Conditions
ON
≥ 10.9 V
2 seconds or more
OFF
Threshold Value
LOW (ON)
a) to b)
GD(H4SO)-182