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Section: Testing & Diagnostics

Engine Controls (Diagnostics) (H4SO)

Engine Controls (Diagnostics) (H4DOTC)

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Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC): Overview Subaru Legacy BL/BP рестайлинг

Testing & Diagnostics 6 illustrations ~1507 words

ECM OPERATION AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

Memorize the freeze frame data. (For test mode $02)

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

Memorize the freeze frame data. (For test mode $02)

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

Memorize the freeze frame data. (For test mode $02)

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

COMPONENT DESCRIPTION

Pressure control solenoid valve

PCV controls the fuel tank pressure to be equal to the atmospheric air pressure. Normally, the solenoid is set to OFF. And the valve opens and closes mechanically in accordance with the pressure difference between tank and atmospheric air, or tank and canister.

The valve is forcibly opened by setting the solenoid to ON at the time of diagnosis.

Scheme 100

Valve Operation and Air Flow

In the figure below, divided by the diaphragm, the part above X is charged with atmospheric air pressure, and the part below X is charged with tank pressure. Also, the part above Y is charged with tank pressure, and the part below Y is charged with canister pressure.

If the atmospheric air pressure port is A, tank pressure port is B, and canister pressure port is C, the air flows according to pressure difference from each port as shown in the table below.

Scheme 101

Condition of pressure	Flow
A < B (solenoid OFF)	B --> C
B < C (solenoid OFF)	C --> B
Solenoid ON	B <--> C

SOLENOID CONDITION CHART

When A < B (solenoid OFF)

Scheme 102

When B < C (solenoid OFF)

Scheme 103

When Solenoid is ON

Scheme 104

Drain valve

Drain valve controls the ambient air to be introduced to the canister.

Scheme 105

Memorize the freeze frame data. (For test mode $02)
Memorize the diagnostic value and trouble standard value. (For test mode $06)

Memorize the freeze frame data. (For test mode $02)

Vehicle speed signals are taken in to the ABS control module and hydraulic control unit, and normal/erroneous data of the ABS wheel speed sensor is received by CAN communication from the ABS control module and hydraulic control unit.

Memorize the freeze frame data. (For test mode $02)

ECM and body integrated unit are connected by high speed CAN.

(Common Specifications)

CAN Protocol 2.0 B (Active)

Frame Format: 11 Bit ID Frame (Standard Frame)

(High speed CAN)

Conforms to ISO 11898

Communication Speed: 500 kbps

Memorize the freeze frame data. (For test mode $02)

Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC): Overview Subaru Legacy BL/BP рестайлинг

ECM OPERATION AT DTC SETTING

COMPONENT DESCRIPTION

Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

Scheme 105

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