Subaru Legacy IV (2008 year). Manual - part 427

GD(H4DOTC)-158

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

• Normality Judgement

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

Time Needed for Diagnosis:
(1): 2000 ms
(2): 2000 ms
(3): 2000 ms
(4): 2000 ms
(5): 24 ms
(6): 2000 ms
(7): 2000 ms

Judgement Value

Malfunction Criteria

Threshold Value

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

< 0.4058 V

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

< 0.127542424 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(H4DOTC)-159

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CI: 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.

(1)

Motor

(3)

Engine control module (ECM)

(4)

Drive circuit

(2)

Throttle position sensor

 

 

 

 

Secondary Parameters

Enable Conditions

Normal operation of electronic throttle 
control

ON

EN-01863

(3)

(4)

(1)

(2)

GD(H4DOTC)-160

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgement

Judge as NG when the following conditions are established.

Time Needed for Diagnosis:
• Difference between target opening angle and actual opening angle: 1000 milliseconds (when target open-
ing angle > actual opening angle) or value of Map 2 (when target opening angle 

d actual opening angle)

• Output duty to drive circuit: value of Map 3

• Normality Judgement

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

Time Needed for Diagnosis:
• Difference between target opening angle and actual opening angle: 2000 ms
• Output duty to drive circuit: 2000 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Judgement Value

Malfunction Criteria

Threshold Value

Difference between target opening angle 
and actual opening angle

t Value of Map 1

Output duty to drive circuit

t 95%

Map1

Target throttle opening angle 
(°) = d

0

d d < 6.15

6.15 

d d < 9.65

9.65 

d d < 14.65

14.65 

d d < 26.65

26.65 

d d

Difference between target 
opening angle and actual 
opening angle (°)

3.5

5

12

25

25

Map2

Throttle position sensor 1 
opening angle (°) = d

0

d d < 5.5

5.5 

d d < 9

9 

d d < 13

13 

d d < 22

22 

d d

Judgement time (milliseconds)

1000

400

300

250

250

Map 3

Voltage to drive circuit (V)

6

8

10

12

14

16

Judgement time (milliseconds)

2000

2000

2000

2000

2000

2000

Judgement Value

Malfunction Criteria

Threshold Value

Difference between target opening angle 
and actual opening angle

< Value of Map 1

Output duty to drive circuit

< 95%

GD(H4DOTC)-161

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CJ:DTC P0700 TRANSMISSION CONTROL SYSTEM (MIL REQUEST)

1. OUTLINE OF DIAGNOSIS

Judge as NG when there is CAN communication with the TCM and there is a MIL lighting request.

2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

• Abnormality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 2500 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

• Normality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: Less than 1 second

Secondary Parameters

Enable Conditions

None

 

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

MIL lighting request from TCM

Yes

Judgement Value

Malfunction Criteria

Threshold Value

Battery voltage

t 10.9 V

MIL lighting request from TCM

None