Inspection Mode BB

DTC	Description & trouble part	Condition	Number of driving cycles on the detecting condition
P0455	EVAP SYSTEM (CPC) LEAK DETECTED (LARGE LEAK)	[Engine Coolant Temperature 1]: 4.4 - 35°C (39.92 - 95°F) [Intake Air Temperature]: 4.4°C or more (39.92°F or more)	2
P0456	EVAP SYSTEM (CPC) LEAK DETECTED (VERY SMALL LEAK)		2
P1451	EVAP SYSTEM CLOG DETECTED (PIPE)		2
P2402	EVAP SYSTEM LEAK DETECTION PUMP CONTROL CIRCUIT HIGH		1
P2404	EVAP SYSTEM LEAK DETECTION PUMP SENSE CIRCUIT RANGE/PERFORMANCE		2
P2420	EVAP SYSTEM SWITCHING VALVE CONTROL CIRCUIT HIGH		1

WARNING: When performing inspection mode BB on a public road, pay sufficient attention to the traffic condition and give the highest priority to safe driving.

NOTE:

If it is necessary to perform inspection mode BB consecutively, drive the vehicle under the following conditions to allow the engine to suck accumulated evaporating gas. Performing the inspection mode BB consecutively without starting the engine causes a large amount of evaporating gas to accumulate in the canister, which hinders an accurate diagnosis.
- After warming-up
- Drive for 10 minutes or more at a speed of 48 km/h (30 MPH) or more (duration of drive can be an accumulation)
To obtain an accurate diagnostic result, perform the procedures according to the following points.
- If fuel level is 100%, inaccurate test results may be obtained.
- Do not refuel gas immediately before performing inspection mode BB. There will be a large amount of evaporating gas immediately after refuel, which may cause a less accurate diagnostic performance.
- Do not shake the vehicle while performing inspection mode BB. Shaking the vehicle causes evaporating gas to increase inside the fuel tank, which may cause a less accurate diagnostic performance.
- Do not perform any service operation including installation or removal of parts or connectors while performing inspection mode BB. Performing service operation could affect on the functions of related parts, which may cause a less accurate diagnostic performance.

Connect the battery charger to the battery. Adjust to 10 A - 15 A so that a voltage of 12 V - 13.5 V or more is maintained, and supply the power.
Using the Subaru Select Monitor, select [Evaporative System Leak Test] on the [Work Support] display.
The screen switches to [Evaporative System Leak Test] screen and a precaution for completion determination pops up. Check the details and select [OK].
Confirmation on execution conditions pops up. If execution conditions are met, select [OK].
NOTE: The value displayed on the pop-up screen is a current value. Execution conditions can be checked on the work support list. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>WORK SUPPORT .
A memory clear instruction pops up. Follow the instruction on the screen to clear memory.
Change the layout of the [Evaporative System Leak Test] screen as follows:
- Display type: Combo Graph
- Horizontal axis: 60 sec
- Items to be displayed: [Evap System Vapor Pressure], [ELCM switching valve], [ELCM pump]
- Vertical axis of the [Evap System Vapor Pressure]: 93.1 kPa - 103.4 kPa (698.42 mmHg - 775.69 mmHg, 27.5 inhg -30.54 inhg, 13.5 psi - 15 psi)

Select the [START] button to perform the evaporative system leak test.

NOTE:

[Running] pops up during testing .
Each phase is performed as follows during testing.

Courtesy of SUBARU OF AMERICA, INC.

(1)	Monitoring phase
(2)	Evaporative emission control system pressure
(3)	ELCM switching valve
(4)	ELCM pump
(5)	ECM
(A)	70 sec
(B)	7 sec
(C)	350 sec
(D)	12 sec
(E)	Within 900 sec
(F)	50 sec
(G)	Phase Z
(H)	Phase A
(I)	Phase B
(J)	Phase C
(K)	Phase D
(L)	Phase E
(M)	Reference pressure
(N)	Tank pressure
(O)	Reference pressure
(P)	OFF
(Q)	ON
(R)	Open
(S)	Close
(T)	OFF: Orifice side
(U)	ON: Evap side

Phase	Explanation of phase	Diagnosis period
A	Vacuum pump operation confirmation and characteristics stability	7 s or less
B	Measurement of reference pressure for setting the target negative pressure	350 s or less
C	Switching valve operation confirmation	12 s or less
D	0.04 inch leak pressure measurement	1200 s or less
	0.02 inch leak pressure measurement
	Clogging of pipe diagnosis and leak pressure measurement
E	Reference pressure measurement for judgment	50 s or less

Wait until the test is finished and the pop-up display changes from [Running] to [No DTC] or [Fault Detection].
NOTE:
- The test is finished in about 15 minutes from the test start. In some cases, it may take up to 30 minutes.
- If [Evaporation leak test could not be executed. The execution condition may not be established. Please prepare execution conditions and re-execute.] is displayed, check execution conditions and perform the evaporative system leak test again. Ref. to ENGINE (DIAGNOSTICS) (H4DO 2.0)>WORK SUPPORT .