Subaru Legacy IV (2008 year). Manual - part 211

GD(H4SO)-146

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CA: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 if the criteria below are met.

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

Secondary Parameters

Enable Conditions

Ignition switch

ON

Judgement Value

Malfunction Criteria

Threshold Value

SUM value of ROM

Standard

GD(H4SO)-147

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CB:DTC P0607 THROTTLE CONTROL SYSTEM CIRCUIT RANGE/PERFORMANCE

1. OUTLINE OF DIAGNOSIS

Judge as NG when any one of the followings is established.
1) When the read value of throttle position sensor 1 signal is mismatched between main CPU and sub CPU.
2) When the read value of accelerator pedal position sensor 1 signal is mismatched between main CPU and
sub CPU.
3) When the sub CPU operates abnormally.
4) When the communication between main CPU 

mo sub CPU is abnormal.

5) When the input amplifier circuit of throttle position sensor 1 is abnormal.
6) When the cruise control cannot be canceled correctly.
7) When the signal of brake SW1 and 2 is mismatched.

2. COMPONENT DESCRIPTION

(1)

Throttle position sensor

(6)

Accelerator pedal position sensor 2

(11)

Amplifier circuit

(2)

Throttle position sensor 1

(7)

Battery

(12)

Engine control module (ECM)

(3)

Throttle position sensor 2

(8)

Stop light

(13)

Sub CPU

(4)

Accelerator pedal position sensor

(9)

Brake switch

(14)

Main CPU

(5)

Accelerator pedal position sensor 1

(10)

I/F circuit

 

 

EN-01862

(1)

(4)

(2)

(3)

(5)

(6)

(7)

(8)

(9)

(12)

(11)

(10)

(10)

(10)

(10)

(13)

(14)

GD(H4SO)-148

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

(1) — (4): Always perform the diagnosis continuously.
(5): Always perform the diagnosis continuously when idling.
(6): Perform the diagnosis when the brake pedal is depressed.
(7): Always perform the diagnosis continuously.
(8): Always perform the diagnosis continuously when the cruise control pedal is not operating.

5. DIAGNOSTIC METHOD

Judge as OK and clear the NG when the malfunction criteria below are met.

Time Needed for Diagnosis:
1. 600 ms
2. 830 ms
3. 200 ms
4. 200 ms
5. 24 ms
6. 250 ms
7. 200 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Secondary Parameters

Enable Conditions

(1) Ignition switch

ON

(2) Ignition switch

ON

(3) None

 — 

(4) None

 — 

(5) Throttle opening angle

 

(6) Brake switch (only with cruise control) ON

(7) None

 — 

Judgement Value

Malfunction Criteria

Threshold Value

(1) Difference of CPU reading value of 
the throttle position sensor signal

d 0.0858 V

(2) Difference of CPU read value of the 
accelerator pedal position sensor signal

d 0.35 V

(3) WD pulse from sub CPU

WD pulse occur

(4) Communication between CPU

Possible to communi-
cate

(5) |Throttle position sensor 1 opening 
angle — (Throttle position sensor 1 
opening angle after passing amplifier) 1/4|

< 3°

(6) Cruise control cancel signal at brake 
ON

Cruise control cancel 
signal ON

(7) Brake switch 1, 2 signal

SW 1 and 2 are 
matched

GD(H4SO)-149

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CC:DTC P0638 THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE 

(BANK 1)

1. OUTLINE OF DIAGNOSIS

Judge as NG when the target opening angle and actual opening angle is mismatched or the current to motor
is the specified duty or more for specified time continuously.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously when the electronic throttle control is operating.

5. DIAGNOSTIC METHOD

Judge as OK and clear the NG when the malfunction criteria below are met.

Time Needed for Diagnosis:
• Target opening angle and actual opening angle: 250 milliseconds (For NG) 2000 milliseconds (For OK)
• Output duty to drive circuit: 2000 milliseconds

(1)

Motor

(3)

Engine control module (ECM)

(4)

Drive circuit

(2)

Throttle position sensor

 

 

 

 

Secondary Parameters

Enable Conditions

Ignition switch

ON

Normal operation of electronic throttle 
control

ON

Judgement Value

Malfunction Criteria

Threshold Value

Difference between target opening angle 
and actual opening angle

3.5° or less

Output duty to drive circuit

95% or less

EN-01863

(3)

(4)

(1)

(2)