Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC): Overview — Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC) — Testing & Diagnostics — Subaru Impreza GD/GC/GG рестайлинг 2 (2005-2007)

Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC): Overview Subaru Impreza GD/GC/GG рестайлинг 2

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 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)

Identifying Fuel Line And Evaporation Fuel Line And Flow Diagram. Scheme 102

Scheme 102: Identifying Fuel Line And Evaporation Fuel Line And Flow Diagram

Diagnostic Method

Fuel system is diagnosed by comparing the target air fuel ratio calculated by ECM with the actual air fuel ratio measured by sensor.

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

Pressure control solenoid valve maintains the fuel tank pressure equal to the atmospheric air pressure. Normally, the solenoid is set to OFF, and the valve mechanically opens and closes in accordance with the difference between the tank pressure and atmospheric air pressure, and the tank pressure and canister pressure.

The solenoid which is set to ON forces to open the valve.

Identifying Pressure Control Solenoid Valve Components. Scheme 103

Scheme 103: Identifying Pressure Control Solenoid Valve Components

Valve Operation and Air Flow

As in the X parts below, there are the area with atmospheric air pressure above the diaphragm and the area with tank pressure below the diaphragm. Also, as in the Y parts below, there are the area with tank pressure above the diaphragm and the area with canister pressure below the diaphragm. In the table below the air flow from each port in accordance with pressure difference is shown with the atmospheric air pressure port A, tank pressure port B and canister pressure port C.

Valve Operation And Air Flow. Scheme 104

Scheme 104: Valve Operation And Air Flow

Pressure Status	Flow
A < B (Solenoid OFF)	B --> C
B < C (Solenoid OFF)	C --> B
Solenoid ON	B <----> C

PRESSURE STATUS AND AIR FLOW SPECIFICATIONS

When A < B (Solenoid OFF)

Valve Operation And Air Flow When A < B (Solenoid OFF). Scheme 105

Scheme 105: Valve Operation And Air Flow When A < B (Solenoid OFF)

When B < C (Solenoid OFF)

Valve Operation And Air Flow When B < C (Solenoid OFF). Scheme 106

Scheme 106: Valve Operation And Air Flow When B < C (Solenoid OFF)

When solenoid is ON

Valve Operation And Air Flow When Solenoid Is ON. Scheme 107

Scheme 107: Valve Operation And Air Flow When Solenoid Is ON

Drain valve

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

Valve Operation And Air Flow For Drain Valve. Scheme 108

Scheme 108: Valve Operation And Air Flow For Drain Valve

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)

CAN connects between ECM and TCM with high speed.

(Common Specification)

CAN PROTCOL 2.0B (active)

Frame format: 11 bit ID Frame (Standard frame)

(High Speed CAN)

ISO 11898 compliance

Communication Speed: 500 kbps

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

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

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

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

Memorize the diagnosis value and trouble standard value. (For test mode $06)

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

Atmospheric pressure sensor is built in ECM.

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

Atmospheric pressure sensor is built in ECM.

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

Atmospheric pressure sensor is built in ECM.

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

Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC): Overview Subaru Impreza GD/GC/GG рестайлинг 2

ECM OPERATION AT DTC SETTING

Identifying Fuel Line And Evaporation Fuel Line And Flow Diagram. Scheme 102

COMPONENT DESCRIPTION

Identifying Pressure Control Solenoid Valve Components. Scheme 103

Valve Operation And Air Flow. Scheme 104

Valve Operation And Air Flow When A < B (Solenoid OFF). Scheme 105

Valve Operation And Air Flow When B < C (Solenoid OFF). Scheme 106

Valve Operation And Air Flow When Solenoid Is ON. Scheme 107

Valve Operation And Air Flow For Drain Valve. Scheme 108

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