Subaru Legacy IV (2008 year). Service manual — part 213
GD(H4SO)-154
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CG: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 CONDITION
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.
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 “ON” and when the
other switches are “OFF”
HIGH (OFF)
Judgement Value
Malfunction Criteria
Threshold Value
Neutral switch signal in ECM when “P”/
“N” range in TCM are “ON” and when the
other switches are “OFF”
LOW (ON)
GD(H4SO)-155
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CH:DTC P0852 NEUTRAL SWITCH INPUT CIRCUIT HIGH (MT MODEL)
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of 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
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 2 seconds after starting the engine.
4. DIAGNOSTIC METHOD
• Abnormality Judgement
Judge NG when the malfunction criteria below are completed determined times or more after the neutral SW
change.
Time Needed for Diagnosis: 3 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear NG when there is change in the neutral SW.
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 (while changing
from a to b below)
HIGH (OFF) continues.
Driving condition change
From a) to b)
a) Engine speed 600 rpm — 900 rpm &
Vehicle speed = 0 km/h (0 MPH)
b) Engine speed 1600 rpm — 900 rpm &
Vehicle speed
t 0 km/h (0 MPH)
Judgement Value
Malfunction Criteria
Threshold Value
Neutral switch signal (while changing
from a to b below)
Changes to LOW
(ON).
Driving condition change
From a) to b)
a) Engine speed 600 rpm — 900 rpm &
Vehicle speed = 0 km/h (0 MPH)
b) Engine speed 1600 rpm — 900 rpm &
Vehicle speed
t 0 km/h (0 MPH)
GD(H4SO)-156
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CI: DTC P1152 O2 SENSOR CIRCUIT RANGE/PERFORMANCE (LOW)
(BANK1 SENSOR1)
1. OUTLINE OF DIAGNOSIS
Detect that
O value remains low.
Judge as NG when lambda value is abnormal in accordance with
O value of front oxygen (A/F) sensor and
running conditions such as vehicle speed, amount of intake air, engine coolant temperature, sub feedback
control, etc.
2. COMPONENT DESCRIPTION
O value = Actual air fuel ratio/Theoretical air fuel ratio
O > 1: Lean
O < 1: Rich
(A)
Electromotive force
(C)
Lean
(D)
Rich
(B)
Air fuel ratio
(1)
Atmosphere
(3)
ZrO
2
(4)
Ceramic heater
(2)
Exhaust gas
(1)
(2)
(4)
(2)
(3)
EN-01693
(C)
(B)
(D)
(A)
GD(H4SO)-157
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Perform diagnosis continuously at a constant speed of 20 km/h (12.4 MPH) or more after 60000 ms have
passed since the engine started.
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.
Time Needed for Diagnosis: 10000 ms
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
Time needed for all secondary parameters to be in enable
conditions
t 4096 ms
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Rear oxygen sensor sub feedback
Execution
Rear oxygen sensor output voltage – Feedback target voltage
–0.2 V — 0.1 V
or rear oxygen sensor sub feedback compensation coefficient
On Min.
or rear oxygen sensor sub feedback compensation coefficient
On Max.
Elapsed time after starting the engine
t 60000 ms
Engine coolant temperature
t 75 °C (167 °F)
Vehicle speed
t 20 km/h (12.4 MPH)
Amount of intake air
t 6 g/s (0.21 oz/s)
Load change at 180°CA
< 0.02 g/rev (0 oz/rev)
Front oxygen (A/F) sensor impedance
0
: — 50 :
Learning value of evaporation gas density
< 0.2
Total time of operating canister purge
t 19.9 s
Targeted lambda value load compensation coefficient
–0.03 — 0.000
Judgement Value
Malfunction Criteria
Threshold Value
O value
< 0.85
Judgement Value
Malfunction Criteria
Threshold Value
O value
t 0.85
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