Subaru Legacy IV (2008 year). Service manual — part 198
GD(H4SO)-94
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BC:DTC P0341 CAMSHAFT POSITION SENSOR “A” CIRCUIT RANGE/
PERFORMANCE (BANK 1 OR SINGLE SENSOR)
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of camshaft position sensor output property.
Judge as NG when the camshaft line signal input timing is shifted from the crankshaft signal because of tim-
ing belt tooth chip etc.
2. COMPONENT DESCRIPTION
(A)
Camshaft signal
(B)
Crankshaft signal
(1)
Boss
(3)
Air gap
(5)
Camshaft one revolution (engine
two revolutions)
(2)
Cam sprocket
(4)
Camshaft position sensor
(A)
(B)
OK
OK
NG
NG
10 CA
#2BTDC10 CA
#4BTDC10 CA
#1BTDC10 CA
30 CA 30 CA
#1BTDC10 CA
#3BTDC10 CA
EN-05542
EN-01782
(1)
(1)
(3)
(4)
(5)
(2)
GD(H4SO)-95
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously at idle speed.
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: 10 engine revs. engine revs.
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: Two engine revolutions
Secondary Parameters
Enable Conditions
Cylinder number identification
Completed
Battery voltage
t 8 V
Engine speed
550 rpm — 1000 rpm
Engine operation
Idling
Misfire
Not detected
Engine load change during 4 milliseconds
d 12799.8 rpm
Judgement Value
Malfunction Criteria
Threshold Value
Position of camshaft position sensor signal Not between BTDC
10°CA and BTDC
80°CA
Judgement Value
Malfunction Criteria
Threshold Value
Position of camshaft position sensor signal Between BTDC 10°CA
and BTDC 80°CA
GD(H4SO)-96
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
BD:DTC P0400 EXHAUST GAS RECIRCULATION FLOW
1. OUTLINE OF DIAGNOSIS
Detect EGR system malfunction.
Intake manifold pressure (negative pressure) is constant because the throttle valve is fully closed during de-
celeration fuel cut. At this time, when the EGR valve is opened/closed, the intake manifold pressure will
change. EGR System OK/NG is judged by the range of this change.
2. COMPONENT DESCRIPTION
(1)
ECM
(4)
CPU
(6)
Main relay
(2)
Detecting circuit
(5)
EGR valve
(7)
Battery power supply
(3)
Switching
circuit
EN-02192
( 1 )
( 2 )
( 3 )
( 4 )
( 5 )
( 6 )
( 7 )
GD(H4SO)-97
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. ENABLE CONDITION
4. GENERAL DRIVING CYCLE
During deceleration fuel cut from 53 km/h (approx. 33 MPH) or more, perform diagnosis once.
Be careful of vehicle speed and engine speed. (Diagnosis will not be completed if the vehicle speed and en-
gine speed conditions become out of specification due to deceleration.)
5. DIAGNOSTIC METHOD
Measure the pressure values when the enable conditions are established, and perform diagnosis by calcu-
lating those results.
1. Label the intake manifold pressure value as PMOF1, which is observed when enable conditions are es-
tablished, and set the EGR target step to 50 steps (nearly full open).
2. Label the intake manifold pressure value as PMON, which is observed after one second has passed since
EGR target step was set to 50 steps (when the enable conditions were established), and set the EGR target
step to 0.
3. Label the intake manifold pressure as PMOF2, which is observed after one second has passed since EGR
target step was set to 0 (after two seconds have passed since the enable conditions were established).
• Abnormality Judgement
Judge as NG when the following conditions are established.
Time Needed for Diagnosis: 1 time
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Secondary Parameters
Enable Conditions
Elapsed time after starting the engine
t 40 s
Engine coolant temperature
t 75 °C(167 °F)
Engine speed
1200 rpm — 2950 rpm
Intake manifold pressure (absolute pressure)
< 44 kPa (330 mmHg, 13 inHg)
Ambient air temperature
t 5 °C(41 °F)
Throttle position
< 0.25 °
Battery voltage
t 10.9 V
Barometric pressure
t 75 kPa (563 mmHg, 22.2 inHg)
Vehicle speed
t58 km/h (36 MPH)
Fuel shut-off function
In operation
Neutral switch
OFF
After neutral switch ON/OFF change
t Value from Map
No load change (A/C, power steering, lighting,
rear defogger, heater fan and radiator fan)
t 5000 ms
Map
Engine coolant temperature
°C (°F)
–40
(–40)
–30
(–22)
–20
(–4)
–10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
After neutral switch change
msec
0
0
0
0
0
0
0
0
Engine coolant temperature
°C (°F)
40
(104)
50
(122)
60
(140)
70
(158)
80
(176)
90
(194)
100
(212)
110
(230)
After neutral switch change
msec
0
0
0
0
0
0
0
0
Judgement Value
Malfunction Criteria
Threshold Value
PMON – (PMOF1 + PMOF2)/2
< 2.5 kPa (18.63 mmHg,
0.7 inHg)
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