Subaru Legacy (2005 year). Manual - part 360

EN(H4DOTC)(diag)-209

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

CHECK ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of main accelerator pedal
position sensor signal and sub accelerator
pedal position sensor signal using Subaru
Select Monitor.

NOTE:

• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-24, Subaru Select Mon-
itor.>

Is the voltage more than 0.4 V? Go to step 2.

Go to step 3.

CHECK POOR CONTACT.
Check poor contact in connector between
ECM and accelerator pedal position sensor.

Is there poor contact?

Repair the poor
contact.

Go to step 12.

CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from accelerator
pedal position sensor.
4) Measure the resistance between ECM con-
nector and accelerator pedal position sensor
connector.

Connector & terminal

(B136) No. 17 — (B315) No. 5:
(B136) No. 15 — (B315) No. 3:
(B136) No. 28 — (B315) No. 2:
(B136) No. 16 — (B315) No. 1:

Is the resistance less than 1
Ω?

Go to step 4.

Repair the open
circuit of harness
connector.

CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
Measure the resistance between ECM connec-
tor and chassis ground.

Connector & terminal

(B136) No. 17 — Chassis ground:
(B136) No. 15 — Chassis ground:
(B136) No. 28 — Chassis ground:
(B136) No. 16 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 5.

Repair the ground
short circuit of har-
ness.

CHECK POWER SUPPLY OF ACCELERA-
TOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between accelerator
pedal position sensor connector and chassis
ground.

Connector & terminal

(B315) No. 3 (+) — Chassis ground (

−

(B315) No. 1 (+) — Chassis ground (

−

Is the voltage 4.5 — 5.5 V?

Go to step 6.

Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4DOTC)-
34, Engine Con-
trol Module
(ECM).>

CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor.

Terminals

No. 3 — No. 4:

Is the resistance 1.2 — 4.8
k

Ω?

Go to step 7.

Replace the accel-
erator pedal posi-
tion sensor.

EN(H4DOTC)(diag)-210

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor.

Terminals

No. 1 — No. 6:

Is the resistance 0.75 — 3.15
k

Ω?

Go to step 8.

Replace the accel-
erator pedal posi-
tion sensor.

CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor without depressing the accel-
erator pedal.

Terminals

No. 5 — No. 4:

Is the resistance 0.2 — 0.8
k

Ω?

Go to step 9.

Replace the accel-
erator pedal posi-
tion sensor.

CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor without depressing the accel-
erator pedal.

Terminals

No. 2 — No. 6:

Is the resistance 0.15 — 0.63
k

Ω?

Go to step 10.

Replace the accel-
erator pedal posi-
tion sensor.

CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor with depressing the accelera-
tor pedal.

Terminals

No. 5 — No. 4:

Is the resistance 0.5 — 2.5
k

Ω?

Go to step 11.

Replace the accel-
erator pedal posi-
tion sensor.

CHECK ACCELERATOR PEDAL POSITION
SENSOR.
Measure the resistance of accelerator pedal
position sensor with depressing the accelera-
tor pedal.

Terminals

No. 2 — No. 6:

Is the resistance 0.28 — 1.68
k

Ω?

Go to step 12.

Replace the accel-
erator pedal posi-
tion sensor.

CHECK ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Turn the ignition switch to OFF.
2) Connect all the connectors.
3) Turn the ignition switch to ON.
4) Read the data of main throttle sensor signal
and sub accelerator pedal position sensor sig-
nal using Subaru Select Monitor.

NOTE:

• Subaru Select Monitor
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H4DOTC)(diag)-24, Subaru Select Mon-
itor.>

Is the voltage less than 4.8 V? Go to step 13.

Go to step 14.

CHECK POOR CONTACT.
Check poor contact in connector between
ECM and accelerator pedal position sensor.

Is there poor contact?

Repair the poor
contact.

Go to step 18.

Step

Check

Yes

EN(H4DOTC)(diag)-211

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Connector & terminal

(B136) No. 34 — (B315) No. 4:
(B136) No. 35 — (B315) No. 6:

Is the resistance less than 1
Ω?

Go to step 15.

Repair the open
circuit of harness
connector.

CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Measure the resistance between accelera-
tor pedal position sensor connector and chas-
sis ground.

Connector & terminal

(B315) No. 4 — Chassis ground:
(B315) No. 6 — Chassis ground:

Is the resistance less than 5
Ω?

Go to step 16.

Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4DOTC)-
34, Engine Con-
trol Module
(ECM).>

CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between accelerator
pedal position sensor connector and chassis
ground.

Connector & terminal

(B315) No. 5 (+) — Chassis ground (

−

(B315) No. 2 (+) — Chassis ground (

−

Is the voltage less than 6 V?

Go to step 17.

Repair the battery
short circuit of har-
ness between
ECM connector
and accelerator
pedal position sen-
sor connector.

CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nector terminals.

Connector & terminal

(B136) No. 17 — (B136) No. 15:
(B136) No. 17 — (B136) No. 16:
(B136) No. 28 — (B136) No. 15:
(B136) No. 28 — (B136) No. 16:

Is the resistance more than 1
M

Ω?

Go to step 18.

Repair the short
circuit to sensor
power supply.

CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from accelerator
pedal position sensor.
4) Measure the resistance between connector
terminals of accelerator pedal position sensor.

Connector & terminal

(B315) No. 5 — (B315) No. 2:

Is the resistance more than 1
M

Ω?

Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H4DOTC)-
34, Engine Con-
trol Module
(ECM).>

Repair the short
circuit of harness
between ECM
connector and
accelerator pedal
position sensor
connector.

Step

Check

Yes

EN(H4DOTC)(diag)-212

ENGINE (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

BW:DTC P2228 BAROMETRIC PRESSURE CIRCUIT LOW

DTC DETECTING CONDITION:
Immediately at fault recognition

CAUTION:
After repair or replacement of faulty parts, perform Clear Memory Mode <Ref. to EN(H4DOTC)(diag)-
37, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)(diag)-30, PROCE-
DURE, Inspection Mode.>.

BX:DTC P2229 BAROMETRIC PRESSURE CIRCUIT HIGH

DTC DETECTING CONDITION:
Immediately at fault recognition

Step

Check

Yes

CHECK ANY OTHER DTC ON DISPLAY.

Is DTC P2228 displayed on the
Subaru Select Monitor?

Replace the ECM.
<Ref. to
FU(H4DOTC)-34,
Engine Control
Module (ECM).>

NOTE:
Atmospheric pres-
sure sensor is inte-
grated into ECM.

Temporary poor
contact occurs.

Step

Check

Yes

CHECK ANY OTHER DTC ON DISPLAY.

Is DTC P2229 displayed on the
Subaru Select Monitor?

Replace the ECM.
<Ref. to
FU(H4DOTC)-34,
Engine Control
Module (ECM).>

NOTE:
Atmospheric pres-
sure sensor is inte-
grated into ECM.

Temporary poor
contact occurs.

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