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Contents

Section: Testing & Diagnostics

Engine Controls - Engine (Diagnostics) (H4SO)

Engine Controls - Engine (Diagnostics) (H4DOTC)

Engine Controls - Engine (Diagnostics) (H6DO)

All sections

Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO): Overview Subaru Outback BP рестайлинг

Testing & Diagnostics 4 illustrations ~1336 words

COMPONENT DESCRIPTION

The variable valve lift system optimizes the intake valve lift by switching between the low lift cam and the high lift cam according to the engine speed. The amount of intake valve lift is varied by controlling the oil switching solenoid valve duty according to signals from the ECM.

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 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)

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 airflows according to pressure difference from each port as shown in the table below.

Scheme 1

Scheme 1: Valve Operation and Air Flow

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

PRESSURE CONDITION AND FLOW REFERENCE

When A < B (solenoid OFF)

Scheme 2

When B < C (solenoid OFF)

Scheme 3

When Solenoid is ON

Scheme 4

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 ABSCM&H/U, and OK/NG data of the vehicle speed, ABS wheel speed sensor is received by CAN communication from the ABSCM&H/U.

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

ECM and TCM 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 ISO11898

Communication Speed: 500 kbps

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

U5 model

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

The barometric pressure sensor is built into the ECM.

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

The barometric pressure sensor is built into the ECM.

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

The barometric pressure sensor is built into the ECM.

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

Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO): Overview Subaru Outback BP рестайлинг

COMPONENT DESCRIPTION

ECM OPERATION AT DTC SETTING

Valve Operation and Air Flow

Scheme 1

Scheme 2

Scheme 3

Scheme 4

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