Subaru Legacy IV (2008 year). Manual - part 634

GD(H6DO)-156

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

CZ: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 

m o 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(H6DO)-157

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.

Secondary Parameters

Enable Conditions

(1) Ignition switch

ON

(1) Battery voltage

t 6 V

(2) Ignition switch

ON

(2) Battery voltage

t 6 V

(3) Ignition switch

ON

(3) Battery voltage

t 6 V

(4) Ignition switch

ON

(4) Battery voltage

t 6 V

(5) Throttle opening angle

 

(5) Ignition switch

ON

(5) Battery voltage

t 6 V

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

(6) Ignition switch

ON

(6) Battery voltage

t 6 V

(7) Ignition switch

ON

(7) Battery voltage

t 6 V

GD(H6DO)-158

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:
(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.

• 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

t 0.4058 V

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

t 0.127542424 V

(3) WD pulse from sub CPU

No WD pulse occur

(4) Communication between CPU

Not possible to communicate

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

t 3 °

(6) Cruise control cancel signal at brake 
ON

Cruise control cancel signal 
OFF

(7) Brake switch 1, 2 signal

SW 1 and 2 are not matched

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 communicate

(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(H6DO)-159

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

DA: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)