2009 SUBARU TRIBECA fuel

GD(H6DO)-124
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CC:DTC P0442 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECT-
ED (SMALL LEAK)
1. OUTLINE OF DIAGNOSIS
Check if there is a leakage in fuel system or not, and perform the function diagnosis of valve.
In this system diagnosis, check for leakage and valve function is conducted by changing the fuel tank pres-
sure and monitoring the pressure change using the fuel tank pressure sensor.
When in 0.04 inch diagnosis, perform in the order of mode Z → mode A → mode B → mode C and mode D;
When in 0.02 inch diagnosis, perform in the order of mode A → mode B → mode C → mode D and mode E.
(1) Fuel gauge (6) Canister (10) Fuel tank
(2) Intake manifold (7) Drain valve (11) Fuel cut valve
(3) Throttle body (8) Fuel temperature sensor (12) Fuel tank pressure sensor
(4) Purge control solenoid valve (9) Fuel level sensor (13) Vent valve
(5) Engine control module (ECM)
EN-03722
(1)(2)(3)
(4)
(5)
(6)
(8)
(12)
(9)(10)
(13)
(11)
(7)

GD(H6DO)-125
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
0.04-inch Diagnosis
Mode Mode Description Diagnosis Period
Mode Z
(Purge control solenoid valve open-
ing failure diagnosis)
Diagnosis starts when there is a change in fuel tank pressure
amount. Purge control solenoid valve open trouble diagnosis
begins.
3 — 16 seconds
Mode A
(Estimated evaporation amount)Calculate the tank pressure change amount (P1). 10 seconds
Mode B
(Sealed negative pressure, large
leakage judgment)
Introduce the intake manifold pressure to the fuel tank and reduce
the tank pressure to the desired value. If the tank pressure cannot
be reduced, it is diagnosed as large leak.
5 — 25 seconds
Mode C
(Pressure increase check,
advanced OK judgment)
Wait until the tank pressure retur ns to the targeted pressure (star t
level of P2 calculation). If the tank pressure does not become the
value, make advanced OK judgment.
1 — 15 seconds
Mode D
(Negative pressure variation mea-
surement, evaporation leakage
diagnosis)
Calculate the tank pressure variation (P2) and obtain the diagnos-
tic value using P1 found in Mode A.
Pe r fo r m t he eva po ra ti o n d ia g no si s u si n g t h e d ia g no st i c val u e.10 seconds
Mode Table for Evaporative Emission Control System Diagnosis
Mode When normal Diagnostic item DTC
Mode ZRoughly same as atmospheric pressure
(Same pressure as 0 kPa (0 mmHg, 0 inHg))
Purge control solenoid valve is judged to
be open.P0457
Mode APressure is in proportion to amount of evap-
orative emission.——
Mode BNegative pressure is formed due to intake
manifold negative pressure
Large leakP0457
Mode C Reaches target pressure — —
Mode D Pressure change is small. EVAP system large leak [1.0 mm (0.04 in)] P0442
ModeZModeAModeBModeCModeD
OKOKOKOKOK
NG
Early OK
Large leakage judgement
Cancel
ModeZExtend
NG
NG
OK
END
EN-02872

GD(H6DO)-126
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
0.02-inch Diagnosis
Mode Mode Description Diagnosis Period
Mode A
(0 Point Compensation)
When pressure in tank is high, wait for 0 point (Near 0 kPa (0
mmHg, 0 inHg)) to return.0 — 12 seconds
Mode B
(Negative pressure introduced)
Decrease the pressure in the tank to the target value by introduc-
ing the intake hose pressure to the fuel tank.0 — 27 seconds
Mode C
(Negative pressure maintained)
Wa i t u nt i l t h e t a nk pr e ss ur e r et u r ns to t he t ar g e t ( s ta r t leve l o f P 2
calculation).0 — 20 seconds
Mode D
(Negative pressure change calcu-
lated)
Calculate the time it takes for the tank pressure to return to the P2
calculation complete pressure. If the tank pressure does not
return to the P2 calculation complete pressure, make advanced
OK judgment.
0 — 200 seconds
Mode E
(Evaporation generated amount cal-
culation)
Calculate the amount of evaporation (P1).
0 — 280 seconds
EN-03044
ModeAModeBModeCModeD
OKOKOK
Early OK 1
Cancel
Cancel
END
Cancel
Cancel
Early OK 2
OKModeE
Cancel
OK

GD(H6DO)-127
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
2. ENABLE CONDITIONS
0.04-inch Diagnosis
Secondary Parameters Enable Conditions
Battery voltage≥ 10.9 V
Barometric pressure≥ 75.1 kPa (563
mmHg, 22.2 inHg)
To t a l t i m e o f c a n i s t e r p u r g e o p e r a t i o n 1 2 0 s e c o n d s o r m o r e
After engine starting 851 seconds or more
Learning value of evaporation gas den-
sity
≤ 0.08
Engine speed 1050 ←→ 7000 rpm
Fuel tank pressure≥ –4.0 kPa (–30
mmHg, –1.18 inHg)
Intake manifold relative vacuum (relative
pressure)
< –26.7 kPa (–200
mmHg, –7.87 inHg)
Ve h i c l e s p e e d≥ 32 km/h (20 MPH)
Fuel level 9.6 ←→ 54.4 2 (2.53
←→ 14.37 US gal,
2.11 ←→ 12.00 Imp
gal)
Closed air/fuel ratio control In operation
Fuel temperature – 10 ←→ 45°C (14
←→ 113°F)
Intake air temperature≥ –10°C (14°F)
Pressure change per second < 0.23 kPa (1.7
mmHg, 0.023 inHg)
Minimum pressure change value every
one second – Maximum pressure
change value
< 0.23 kPa (1.7
mmHg, 0.023 inHg)
Change of fuel level < 2 2 (2.1 US qt, 1.76
Imp qt)/131 millisec-
onds
Air fuel ratio 0.76 — 1.25

GD(H6DO)-128
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
0.02-inch Diagnosis
Secondary Parameters Enable Conditions
(At starting a diagnosis)
Evap. diagnosis Incomplete
Battery voltage≥ 10.9 V
Atmospheric pressure≥ 75.1 kPa (563
mmHg, 22.2 inHg)
Time since last incomplete diagnosis
event of 0.02-inch leakage
> 600 seconds (Can-
celed with the mode
other than mode A)
> 120 seconds (Can-
celed with mode A)
To t a l t i m e o f c a n i s t e r p u r g e o p e r a t i o n 1 2 0 s e c o n d s o r m o r e
After engine starting 120 seconds or more
Fuel temp. –10 ←→ 50°C (14
←→ 122°F)
Fuel level 9.6 ←→ 54.4 2
(2.54 ←→ 14.37 US
gal, 2.11 ←→ 12.00
Imp gal)
Intake manifold relative vacuum (relative
pressure)
< –8.0 kPa (–60
mmHg, –2.36 inHg)
Fuel tank pressure –0.53 — 0.39 kPa (–4
— 2.9 mmHg, –0.16 —
0.12 inHg)
Ve h i c l e s p e e d≥ 30 km/h (62 MPH)
Closed air/fuel ratio control In operation
Engine speed 500 — 7000 rpm
(During diagnosis)
Change of fuel level≤ 5 2 (1.3 US qt, 1.1
Imp qt)
Pressure change every one second < 0.04 kPa (0.3
mmHg, 0.01 inHg)
Minimum pressure change value every
one second – Maximum pressure
change value every one second (Mode
A)
< 0.06 kPa (0.45
mmHg, 0.018 inHg)
Minimum pressure change value every
one second – Maximum pressure
change value every one second (Mode
D)
< 0.08 kPa (0.564
mmHg, 0.024 inHg)
Atmospheric pressure change (Mode D) –0.47 ←→ 0.32 kPa (–
3.5 ←→ 2.4 mmHg, –
0.14 ←→ 0.09 inHg)
Atmospheric pressure change (Mode E) –0.32 ←→ 0.32 kPa (–
2.4 ←→ 2.4 mmHg, –
0.09 ←→ 0.09 inHg)

GD(H6DO)-129
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
3. GENERAL DRIVING CYCLE
0.04-inch Diagnosis
Perform the diagnosis only once in 851 seconds or more after starting the engine, at a constant speed of 32
km/h (20 MPH) or more.
Pay attention to the fuel temperature and fuel level.
0.02-inch Diagnosis
Perform the diagnosis after 120 seconds or more after starting the engine, at a constant engine RPM of 30
km/h (19 MPH) or higher, to judge as NG or OK.
If OK/NG judgment is not possible, repeat the diagnosis.
Pay attention to the fuel temperature and fuel level.
4. DIAGNOSTIC METHOD
0.04-inch Diagnosis
Mode Z: (Purge control solenoid valve opening failure diagnosis)
When performing the leakage diagnosis of the EVAP system, the purge control solenoid valve must operate
properly. Therefore, mode Z is used to diagnose a stuck open condition of the purge control solenoid valve
by monitoring the tank pressure.
Note that if a purge control solenoid valve stuck open fault is detected, the EVAP system leakage diagnosis
is cancelled.
Purge Control Solenoid Valve Stuck Open Diagnosis
DTC
P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Diagnostic method
Purge control solenoid valve stuck open diagnosis is performed in mode Z as shown in the figure below.
(1) Engine (4) Drain valve (6) Fuel tank pressure sensor
(2) Purge control solenoid valve (5) Fuel tank
(3) Canister
EN-03723
(2)
(1)(3)
(4)
(5)
(6)

GD(H6DO)-130
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Purge Control Solenoid Valve Function Diagnosis
DTC
P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Purge control solenoid valve functional diagnosis is performed by monitoring the tank pressure in mode Z.
Normality Judgment
Make OK judgment 3 seconds after Mode Z starts, and change to Mode A if OK.
Normal
•evptez – evptezha ≤ 0.4 kPa (3.0 mmHg, 0.12 inHg)
•evptezini – evptezha ≤ 0.4 kPa (3.0 mmHg, 0.12 inHg)
Judge normal when these calculations are completed.
Abnormality Judgment
If OK judgment cannot be made, extend Mode Z 16 seconds more, and Judge as NG when all the criteria be-
low are completed in 16 seconds.
Time Needed for Diagnosis: 16 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunctions occur in 2 continuous driving cy-
cles.
Judgment Value
Malfunction Criteria Threshold Value DTC
(Tank pressure when Mode Z started) –
(Tank pressure when Mode Z finished)
≤ 0.4 kPa (3 mmHg,
0.12 inHg)
P0457
(1) Mode Z (3) Fuel tank pressure (5) OK judgement
(2) 3 seconds (4) 0.4 kPa (3.0 mmHg, 0.12 inHg)
Judgment Value
Malfunction Criteria Threshold Value DTC
(Tank pressure when Mode Z started) –
(Tank pressure when Mode Z finished)
> 0.6 kPa (4.5 mmHg,
0.18 inHg)
P0457
Ta n k p r e s s u r e w h e n M o d e Z s t a r t e d≤ 1.43 kPa (10.7
mmHg, 0.42 inHg)

Time of 22 or more fuel no sloshing≥ 40 sec.
EN-02869
(1)
(2)
(4)
evptez
evptezinievptezha
0
(3)
(5)

GD(H6DO)-131
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
When judgment for purge control solenoid valve stuck open NG is made, end the evaporative diagnosis.
Cancel the evaporative diagnosis when the OK/NG judgment for drain valve stuck closed and purge control
solenoid valve stuck open cannot be made in Mode Z.
•evptezini, evptez ≤ 1.43 kPa (10.7 mmHg, 0.42 inHg)
•evptez – evptezha ≤ 0.87 kPa (6.5 mmHg, 0.26 inHg)
•evptezini – evptezha ≤ 0.87 kPa (6.5 mmHg, 0.26 inHg)
•No fuel sloshing of over 22(0.79 US gal, 0.67 Imp gal) for more than 40 seconds.
Judge as normal when all are established.
(1) Mode Z (4) Fuel tank pressure (7) 40 seconds no fuel sloshing
(2) Extended mode Z (5) 0.87 kPa (6.5 mmHg, 0.26 inHg) (8) NG Judgment
(3) 16 seconds (6) 1.43 kPa (10.7 mmHg, 0.42 inHg)
EN-02870
(8)
(7)
(6)
(4)
(5)
evptez
evptezini
evptezha
0
(3)
(2)(1)