2009 SUBARU TRIBECA fuel pressure

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)

GD(H6DO)-132
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Leak Diagnosis
DTC
P0442 Evaporative Emission Control System Leak Detected (Small Leak)
P0457 Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Diagnostic method
The diagnostic method consists of creating a sealed vacuum in the fuel tank and then determining the pres-
ence of leakage from the speed at which the tank internal pressure returns to atmospheric pressure.
Mode A: (Estimated evaporation gas amount)
Calculate the tank pressure change amount (P1) when using mode A. After calculating P1, switch to mode B.
Mode B: (Negative pressure sealed)
Introduce negative pressure in the intake manifold to the tank.
Approx. 0 → –1.4 (0 → –10.5, 0 → –0.41) kPa (mmHg, inHg)
When the pressure above (desired negative pressure) is reached, enters Mode C.
In this case, if the tank pressure does not become the desired negative pressure, judge that there is a large
leakage (10 seconds or 25 seconds) in the system.
Abnormality Judgment
Judge as NG (large leak) when the criteria below are met.
Mode C: (Check pressure rise)
Stop the introduction of negative pressure. (Wait until the tank pressure returns to the start level of P2 cal-
culation.)
Change to Mode D when the tank pressure returns to the start level of P2 calculation.
Judge immediate OK and change to Mode E when it does not return in spite of spending the specified time.
Mode D: (Measure amount of negative pressure change)
Monitor the tank pressure change amount when using mode D. In this case, the tank pressure increases,
(nears atmospheric pressure) because evaporation occurs. However, if any leakage exists, the pressure in-
creases additionally in proportion to this leakage. The pressure variation of this tank is P2.
After calculating P2, perform a small leak diagnosis according to the items below.
When Mode D is ended
Assign tank variations measured in Mode A and Mode B; P1 and P2, to the formula below, judge small leaks
in the system. If the measured judgment value exceeds the threshold value, it is judged to be a malfunction.
Judge as NG when the criteria below are completed and Judge as OK when not completed.
* 1.5: Evaporation amount compensation value when below negative pressure (Amount of evaporation occurrence increases as
a vacuum condition increases.)
Judgment Value
Malfunction Criteria Threshold Value DTC
Time to reach targeted negative pres-
sure
≥ 25 sec. P0457
Or mode B time≥ 10 sec.
(Min. pressure value in tank when in
mode B) – (Tank pressure when mode B
started)
< –0.5 kPa
(–4 mmHg, –0.15 inHg)

Ta n k p r e s s u r e w h e n s t a r t i n g
calculation of P2
Time for advanced OK
judgment
–1.3 kPa (–9.75 mmHg, –0.38 inHg) 15 seconds
Judgment Value
Malfunction Criteria Threshold Value DTC
P2 – 1.5 × P1 > Value of Map 1 P0442
P2: Tank pressure that changes every 10
seconds in mode D
* Threshold value: Fig-
ure (Remaining Fuel
vs Tank temperature)

P1: Tank pressure that changes every 10
seconds in mode A

GD(H6DO)-133
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Time Needed for Diagnosis: 30 to 100 seconds
0.02-inch Diagnosis
DTC
P0456 Evaporative Emission Control System Leak Detected (very small leak)
Diagnostic method
The diagnostic method consists of creating a sealed vacuum in the fuel tank and then determining the pres-
ence of leakage from the speed at which the tank internal pressure returns to atmospheric pressure.
Mode A: (0 Point Compensation)
When pressure in tank is high, wait for 0 point 0 kPa (Near 0 mmHg, 0 inHg) to return.Shift to mode B when
0 point returns.
Cancel the diagnosis when 0 point does not return in the specified time.
Mode B: (Negative pressure introduced)
Introduce negative pressure in the intake manifold to the tank.
Approx. 0 → –2.0 kPa (0 mmHg → –15 mmHg, 0 → –0.59 inHg)
When the pressure above (desired negative pressure) is reached, Mode C is entered.
Cancel the diagnosis when the targeted pressure in the tank is not reached.
Mode C: (Negative pressure maintained)
Stop the introduction of negative pressure and wait until the tank pressure returns to the start level of P2 cal-
culation.
Change to Mode D either when the tank pressure returns to the start level of P2 calculation, or when the pre-
determined amount of time has passed.
Mode D: (Calculate the amount of negative pressure change)
Monitor the tank pressure in mode D, calculate (P2) the pressure change in the tank, and measure the time
(evpdset) for the tank pressure to return when calculation of P2 is completed. Shift to mode E when pressure
returns. Make an advance OK judgment using the value of P2, or cancel, when the pressure in the tank does
not return after calculation of P2 is completed even when the predetermined amount of time has passed.
When the following conditions are established, it is OK.
Map 1 Failure diagnosis reference limit for 0.04 in leaks for evaporation diagnosis
Fuel temperature & Fuel level 25°C (77°F) 30°C (86°F) 35°C (95°F) 40°C (104°F) 45°C (113°F)
10 L (2.6 US gal, 2.2 Imp gal)
0.28 kPa
(2.1 mmHg,
0.083 inHg)
0.29 kPa
(2.2 mmHg,
0.087 inHg)
0.31 kPa
(2.3 mmHg,
0.090 inHg)
0.31 kPa
(2.35 mmHg,
0.092 inHg)
0.32 kPa
(2.4 mmHg,
0.094 inHg)
20 L (5.3 US gal, 4.4 Imp gal)
0.31 kPa
(2.3 mmHg,
0.091 inHg)
0.32 kPa
(2.4 mmHg,
0.094 inHg)
0.33 kPa
(2.5 mmHg,
0.098 inHg)
0.35 kPa
(2.6 mmHg,
0.102 inHg)
0.36 kPa
(2.7 mmHg,
0.106 inHg)
30 L (7.9 US gal, 6.6 Imp gal)
0.39 kPa
(2.9 mmHg,
0.114 inHg)
0.41 kPa
(3.05 mmHg,
0.120 inHg)
0.42 kPa
(3.15 mmHg,
0.124 inHg)
0.43 kPa
(3.25 mmHg,
0.128 inHg)
0.45 kPa
(3.35 mmHg,
0.134 inHg)
40 L (10.6 US gal, 8.8 Imp gal)
0.39 kPa
(2.9 mmHg,
0.114 inHg)
0.42 kPa
(3.15 mmHg,
0.124 inHg)
0.44 kPa
(3.3 mmHg,
0.130 inHg)
0.45 kPa
(3.4 mmHg,
0.134 inHg)
0.47 kPa
(3.5 mmHg,
0.138 inHg)
50 L (13.2 US gal, 11.0 Imp gal)
0.43 kPa
(3.2 mmHg,
0.126 inHg)
0.44 kPa
(3.3 mmHg,
0.130 inHg)
0.47 kPa
(3.5 mmHg,
0.138 inHg)
0.48 kPa
(3.6 mmHg,
0.142 inHg)
0.49 kPa
(3.7 mmHg,
0.146 inHg)
Judgment Value
Malfunction Criteria Threshold Value DTC
Advanced OK judgment 1 P0456
Mode D holding time≥ 30 s
Ta n k p r e s s u r e≤ Value of Map 2
Advanced OK judgment 2
Mode D Time≥ 200 s
P2≥ 0.9 — 1.3 kPa (7 — 9.6
mmHg, 0.28 — 0.38 inHg)

GD(H6DO)-134
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Mode E: (Evaporation occurrence amount calculation)
Calculate the change of tank pressure with the time evpdset to Judge as NG/OK according to the value of P1.
(ambiguous determination acceptable.)
Abnormality Judgment
When the following conditions are established, it is NG.
Map 2 Fuel level and corresponding tank pressure
Fuel level
10 L (2.6 US
gal, 2.2 Imp
gal)
20 L (5.3 US
gal, 4.4 Imp
gal)
30 L (7.9 US
gal, 6.6 Imp
gal)
40 L (10.6 US
gal, 8.8 Imp
gal)
50 L (13.2 US
gal, 11.0 Imp
gal)
Ta n k p r e s s u r e
–1.8 kPa
(–13.5 mmHg,
–0.53 inHg)
–1.77 kPa
(–13.3 mmHg,
–0.52 inHg)
–1.75 kPa
(–13.1 mmHg,
–0.52 inHg)
–1.67 kPa
(–12.5 mmHg,
–0.49 inHg)
–1.6 kPa
(–12 mmHg, –
0.47 inHg)
Judgment Value
Malfunction Criteria Threshold Value DTC
P1 < Value of Map 3
* Threshold value: Fig-
ure (Residual Fuel
Amount vs evpdset)
P0456
Map 3 Failure diagnosis reference limit for 0.02 in leaks for evaporative emission control system di-
agnosis
Time evpdset & Fuel level 0 seconds 50 seconds 65 seconds 120 seconds 150 seconds 200 seconds
10 L (2.6 US gal, 2.2 Imp gal)
0 kPa
(0 mmHg,
0 inHg)
0.19 kPa
(1.4 mmHg,
0.056 inHg)
0.25 kPa
(1.84 mmHg,
0.074 inHg)
0.25 kPa
(1.84 mmHg,
0.074 inHg)
0.25 kPa
(1.84 mmHg,
0.074 inHg)
0.25 kPa
(1.84 mmHg,
0.074 inHg)
20 L (5.3 US gal, 4.4 lmp gal)
0 kPa
(0 mmHg,
0 inHg)
0.21 kPa
(1.54 mmHg,
0.062 inHg)
0.23 kPa
(1.76 mmHg,
0.068 inHg)
0.23 kPa
(1.76 mmHg,
0.068 inHg)
0.23 kPa
(1.76 mmHg,
0.068 inHg)
0.23 kPa
(1.76 mmHg,
0.068 inHg)
30 L (7.9 US gal, 6.6 lmp gal)
0 kPa
(0 mmHg,
0 inHg)
0.22 kPa
(1.68 mmHg,
0.065 inHg)
0.22 kPa
(1.68 mmHg,
0.065 inHg)
0.22 kPa
(1.68 mmHg,
0.065 inHg)
0.22 kPa
(1.68 mmHg,
0.065 inHg)
0.22 kPa
(1.68 mmHg,
0.065 inHg)
40 L (10.6 US gal, 8.8 lmp
gal)
0 kPa
(0 mmHg,
0 inHg)
0.18 kPa
(1.315 mmHg,
0.053 inHg)
0.18 kPa
(1.315 mmHg,
0.053 inHg)
0.18 kPa
(1.315 mmHg,
0.053 inHg)
0.18 kPa
(1.315 mmHg,
0.053 inHg)
0.18 kPa
(1.315 mmHg,
0.053 inHg)
50 L (13.2 US gal, 11.0 lmp
gal)
0 kPa
(0 mmHg,
0 inHg)
0.13 kPa
(0.95 mmHg,
0.038 inHg)
0.13 kPa
(0.95 mmHg,
0.038 inHg)
0.13 kPa
(0.95 mmHg,
0.038 inHg)
0.13 kPa
(0.95 mmHg,
0.038 inHg)
0 kPa
(0 mmHg,
0 inHg)