Subaru Legacy IV (2008 year). Service manual — part 859

TPM(diag)-22

Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern

TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)

C: TIRE PRESSURE WARNING LIGHT DOES NOT COME OFF

DETECTING CONDITION:
• Defective combination meter
• Tires pressure drop
• Transmitter ID not registered
TROUBLE SYMPTOM:
Tire pressure warning light remains illuminating after engine starts.
WIRING DIAGRAM:

FB-36

F/B FUSE NO.5

(IG)

2

6

A:

i10

B:

i11

A3

B6

FB-17

F/B FUSE NO. 7

(B)

i102

R167

R211

FB-48

F/B FUSE NO. 4

(IG)

16

5

9

1 2 3

4 5 6

7 8 9 10 11 12 13 14

B:

i11

i102

1 2 3
8 9 10

4

11 12 13 14 15 16

5 6 7

A:

i10

1 2 3 4 5

6 7 8 9 10

11 12

19 20 21

13 14 15 16

17 18

22

R211

1 2 3 4 5 6
7 8 9 10 11 12

TPM00042

TO POWER SUPPLY CIRCUIT

COMBINATION

METER

TIRE INFLATION
PRESSURE
WARNING LIGHT

DRIVE CIRCUIT

MICRO COMPUTER

TPM CONTROL MODULE

TPM(diag)-23

Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern

TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK DIAGNOSTIC TROUBLE CODE
(DTC).
Connect the Subaru Select Monitor, and read
the Diagnostic Trouble Code. <Ref. to
TPM(diag)-8, READ DIAGNOSTIC TROUBLE
CODE (DTC), OPERATION, Subaru Select
Monitor.>

Is DTC displayed?

Perform the diag-
nosis according to
DTC. <Ref. to
TPM(diag)-26, List
of Diagnostic Trou-
ble Code (DTC).>

Go to step 2.

2

CHECK TRANSMITTER (ID).
Display the transmitter ID of the tire pressure
monitor system.

Is the transmitter ID registered? Go to step 3.

Register the trans-
mitter ID. <Ref. to
TPM(diag)-10,
REGISTER
TRANSMITTER
ID, OPERATION,
Subaru Select
Monitor.>

3

CHECK TRANSMITTER DATA OUTPUT.
1) Select data display of the tire pressure mon-
itoring.
2) Start the engine and check the tire pressure
warning light output.

Is the warning light output ON? Replace the tire

pressure monitor-
ing control module.
<Ref. to WT-11,
TIRE PRESSURE
MONITORING
CONTROL MOD-
ULE, REMOVAL,
Tire Pressure
Monitoring Sys-
tem.>

Replace the com-
bination meter.
<Ref. to IDI-22,
REMOVAL, Com-
bination Meter.>

TPM(diag)-24

Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern

TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)

D: TIRE PRESSURE WARNING LIGHT IS 25 TIMES BLINKING AND TURN ON

DETECTING CONDITION:
• Tire pressure monitoring control module is faulty.
• Defective harness
• Transmitter is faulty.
TROUBLE SYMPTOM:
Every time the engine starts, tire pressure warning light blinks 25 times and then illuminates.
WIRING DIAGRAM:

FB-36

F/B FUSE NO.5

(IG)

2

6

A:

i10

B:

i11

A3

B6

FB-17

F/B FUSE NO. 7

(B)

i102

R167

R211

FB-48

F/B FUSE NO. 4

(IG)

16

5

9

1 2 3

4 5 6

7 8 9 10 11 12 13 14

B:

i11

i102

1 2 3
8 9 10

4

11 12 13 14 15 16

5 6 7

A:

i10

1 2 3 4 5

6 7 8 9 10

11 12

19 20 21

13 14 15 16

17 18

22

R211

1 2 3 4 5 6
7 8 9 10 11 12

TPM00042

TO POWER SUPPLY CIRCUIT

COMBINATION

METER

TIRE INFLATION
PRESSURE
WARNING LIGHT

DRIVE CIRCUIT

MICRO COMPUTER

TPM CONTROL MODULE

TPM(diag)-25

Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern

TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK DIAGNOSTIC TROUBLE CODE
(DTC).
Connect the Subaru Select Monitor, and read
the Diagnostic Trouble Code. <Ref. to
TPM(diag)-8, READ DIAGNOSTIC TROUBLE
CODE (DTC), OPERATION, Subaru Select
Monitor.>

Is diagnostics code (DTC) dis-
played?

Perform the diag-
nosis according to
DTC. <Ref. to
TPM(diag)-26, List
of Diagnostic Trou-
ble Code (DTC).>

Go to step 2.

2

CHECK HARNESS.
1) Connect the Subaru Select Monitor to the
terminal No. 2 of the tire pressure monitoring
control module connector (R211).

Connector & terminal

(R211) No. 2 (+) — Chassis ground (–):

2) Turn the ignition switch to ON, and select
“Oscilloscope” from the Main Menu of Subaru
Select Monitor.
3) Check the voltage displayed.

Is the voltage 10 V or more?

Go to step 3.

Go to step 4.

3

CHECK HARNESS.
1) Check the output waveform displayed in the
oscilloscope of Subaru Select Monitor.

Is the pattern the same output
waveform as shown in the fig-
ure?
(1) 400

r20 ms Duty 50 %

High: Battery voltage
Low:1.5 V or less

Check the combi-
nation meter.

Replace the tire
pressure monitor-
ing control module.
<Ref. to WT-11,
REMOVAL, Tire
Pressure Monitor-
ing System.>

4

CHECK HARNESS.
1) Disconnect the tire pressure monitoring
control module connector.
2) Connect the Subaru Select Monitor to the
terminal No. 2 of the tire pressure monitoring
control module connector (R211).

Connector & terminal

(R211) No. 2 (+) — Chassis ground (–):

3) Turn the ignition switch to ON, and select
“Oscilloscope” from the Main Menu of Subaru
Select Monitor.
4) Check the voltage displayed.

Is the voltage 10 V or more?

Replace the tire
pressure monitor-
ing control module.
<Ref. to WT-11,
REMOVAL, Tire
Pressure Monitor-
ing System.>

The harness
between the com-
bination meter
connector and the
tire pressure moni-
toring control mod-
ule connector is
shorted or open.
Repair or replace
the harness.

TPM00044

High

Low

(1)