2009 SUBARU TRIBECA Service Workshop Manual

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Page 1737 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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 diag

Page 1738 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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

Page 1739 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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 p

Page 1740 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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
Batt

Page 1741 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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

Page 1742 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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

Page 1743 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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 evapor

Page 1744 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual 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 Con

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

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