DTC P0065: Air Assisted Injector Control Range/Performance

OUTLINE OF DIAGNOSIS
Detect the malfunction of AAI solenoid valve.

Intake manifold pressure (negative pressure) is constant because the throttle valve is fully closed during fuel cut at deceleration. At this time, opening AAI solenoid valve makes the intake manifold pressure larger. For AAI solenoid valve function diagnosis, judge OK or NG by the amount of change of intake manifold pressure when opening and closing the AAI solenoid valve.

Max. value with the valve open - Min. value with the valve closed < Threshold value --> NG

Max. value with the valve open - Min. value with the valve closed "GREATER THAN EQUAL TO" Threshold value --> OK

Fig 1: Air Assisted Injector Control Range/Performance Graphical Representation
Courtesy of SUBARU OF AMERICA, INC.
COMPONENT DESCRIPTION

Fig 2: Identifying Air Assisted Injector Control Stem Components
Courtesy of SUBARU OF AMERICA, INC.

ENABLE CONDITION

ENABLE CONDITIONS

Secondary Parameters	Enable Conditions
Engine coolant temperature	"GREATER THAN EQUAL TO" 75°C (167°F)
Engine speed	1,300 <---> 2,300 rpm
Vehicle speed	"GREATER THAN EQUAL TO" 60 km/h (37 MPH)
Atmospheric pressure	"GREATER THAN EQUAL TO" 86 kPa (642 mmHg, 25 inHg)
Atmospheric-MAP	"GREATER THAN EQUAL TO" 53 kPa (400 mmHg, 16 inHg)
Fuel cut event by coasting	In operation
AAI solenoid valve position	OFF (closed)

GENERAL DRIVING CYCLE
Conduct a serial diagnosis during fuel cut at deceleration from more than 60 km/h (37 MPH).

Be careful for vehicle speed and engine speed. (Diagnosis may not finish if the vehicle speed and engine speed conditions become out of specification.)

DIAGNOSTIC METHOD

Judge NG when the malfunction criteria below are completed 2 times in a row. Judge OK and clear the NG if not completed once

Judgment Value

JUDGMENT VALUE

Malfunction Criteria	Threshold Value
Paai1 - Paai2
Paai1; max. MAP value during AAI solenoid valve ON signal	700 Pa (5 mmHg, 0.2 inHg) (101 kPa (760 mmHg, 30 inHg) atmospheric pressure condition)
Paai2; min. MAP value during 0.5 seconds just before changing the valve from OFF to ON	53 Pa (0.4 mmHg, 0.016 inHg) (86 kPa (642 mmHg, 25 inHg) atmospheric pressure condition)

Time needed for diagnosis: 9 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "Clear Memory" was performed
MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" was performed
FAIL SAFE
None
ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)