Subaru Legacy IV (2008 year). Manual - part 633

GD(H6DO)-152

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CW:DTC P0600 SERIAL COMMUNICATION LINK

1. OUTLINE OF DIAGNOSIS

Detect malfunction of CAN communication.
When CAN communications is not possible, and CAN communications with TCM is not possible, judge as
NG if data from the TCM is not normal.

2. COMPONENT DESCRIPTION

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

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after starting the engine.

5. DIAGNOSTIC METHOD

• Abnormality Judgement

Judge as NG when the following conditions are established.

Time Needed for Diagnosis: Less than 1 second
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Secondary Parameters

Enable Conditions

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

> 10.9 V

Starter switch

OFF

Engine

run

bus off flag or error warning flag

set (error)

or

 

ID received from control module con-
nected to driving system CAN

None during 500 milli-
seconds

or

 

Data updated from control module con-
nected to driving system CAN

None during 500 milli-
seconds

GD(H6DO)-153

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

• Normality Judgement

Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.

Time Needed for Diagnosis: 1000 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

> 10.9 V

Starter switch

OFF

Engine

run

bus off flag or error warning flag

clear (No error)

ID received from control module con-
nected to driving system CAN

Yes

Data updated from control module con-
nected to driving system CAN

Yes

GD(H6DO)-154

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CX:DTC P0604 INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY 

(RAM) ERROR

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of microcomputer (RAM).
When there is a problem in the main CPU normal RAM, or the sub CPU normal RAM, judge as NG. Judge
as OK when both are operating properly.
If it is possible to write data to the whole area of RAM in the initial routine, and is possible to read the same
data, it is judged as OK, and if not, NG.

2. ENABLE CONDITION

Diagnosis with the initial routine.

3. GENERAL DRIVING CYCLE

Perform the diagnosis as soon as the ignition switch is turned to ON.

4. DIAGNOSTIC METHOD

• Abnormality Judgement

Judge as NG when the following conditions are established.

Time Needed for Diagnosis: Less than 1 second
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

• Normality Judgement

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis: Less than 1 second

Secondary Parameters

Enable Conditions

None

 

Judgement Value

Malfunction criteria

Threshold value

Write the specified value to RAM and 
then read.

The written value can-
not be read.

Judgement Value

Malfunction criteria

Threshold value

Write the specified value to RAM and 
then read.

The written value can 
be read.

GD(H6DO)-155

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CY:DTC P0605 INTERNAL CONTROL MODULE READ ONLY MEMORY (ROM) 

ERROR

1. OUTLINE OF DIAGNOSIS

Judge as NG when SUM value of ROM is outside the standard value.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

• Abnormality Judgement

Judge as NG when the following conditions are established.

Time Needed for Diagnosis:
• Main CPU: 16 milliseconds × 32 time(s)
• Sub CPU: 16 milliseconds × 2 time(s)
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

• Normality Judgement

Judge as OK and clear the NG if the following conditions are established.

Time Needed for Diagnosis:
• Main CPU: 16 milliseconds × 125 time(s)
• Sub CPU: 16 milliseconds × 2 time(s)

Secondary Parameters

Enable Conditions

Ignition switch

ON

Judgement Value

Malfunction criteria

Threshold value

SUM value of ROM

Standard

Judgement Value

Malfunction criteria

Threshold value

SUM value of ROM

Standard