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)
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