Subaru Legacy IV (2008 year). Service manual — part 854
TPM(diag)-2
Basic Diagnostic Procedure
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
CAUTION:
Remove foreign matter (dust, water, oil etc.) from the tire pressure monitoring control module con-
nector when removing or installing.
NOTE:
To check harness for open or short circuits, shake the suspected trouble spot or connector.
Step
Check
Yes
No
1
CHECK PRE-INSPECTION.
1) Check with the user regarding when the
warning light lit or started blinking.
2) Before performing diagnostics, check all
components which may adversely affect the tire
pressure monitor system. <Ref. to TPM(diag)-
3, INSPECTION, General Description.>
Is the component that might
affect the tire pressure monitor
system normal?
Go to step 2.
Repair or replace
each component.
2
CHECK DIAGNOSTIC TROUBLE CODE
(DTC).
1) Turn the ignition switch to OFF.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON and run the
Subaru Select Monitor.
NOTE:
If the communication function of the Subaru Se-
lect Monitor cannot be executed normally,
check the communication circuit. <Ref. to
TPM(diag)-11, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>
4) Read the DTC. <Ref. to TPM(diag)-16,
OPERATION, Read Diagnostic Trouble Code
(DTC).>
Is DTC displayed?
Go to step 4.
Go to step 3.
3
PERFORM GENERAL DIAGNOSTICS.
1) Perform the inspection by referring to “Gen-
eral Diagnostic Table”. <Ref. to TPM(diag)-38,
General Diagnostic Table.>
2) Perform the Clear Memory Mode. <Ref. to
TPM(diag)-9, CLEAR MEMORY, OPERATION,
Subaru Select Monitor.>
3) Perform the Inspection Mode. <Ref. to
TPM(diag)-17, Inspection Mode.>
4) Read the DTC. <Ref. to TPM(diag)-8, READ
DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
Check the DTC is not displayed.
Does the tire pressure warning
light illuminates for about 2 sec-
onds and then foes off after
turning on the ignition switch,
and then go out?
Finish the diagno-
sis.
Check by referring
to “Diagnostic Pro-
cedure for TPM”.
<Ref. to
TPM(diag)-14,
WITHOUT DTC,
INSPECTION,
Subaru Select
Monitor.>
4
PERFORM DIAGNOSIS.
1) Refer to “List of Diagnostic Trouble Code
(DTC)”.
2) Correct the cause of trouble.
3) Perform the Clear Memory Mode. <Ref. to
TPM(diag)-9, CLEAR MEMORY, OPERATION,
Subaru Select Monitor.>
4) Perform the drive test.
Drive the vehicle at 40 km/h (25 MPH) or faster
for at least 10 minutes.
5) Read the DTC. <Ref. to TPM(diag)-8, READ
DIAGNOSTIC TROUBLE CODE (DTC),
OPERATION, Subaru Select Monitor.>
Is DTC displayed?
Repeat steps 1 to 4
until DTC is not
shown.
Finish the diagno-
sis.
TPM(diag)-3
General Description
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
2. General Description
A: CAUTION
1. SUPPLEMENTAL RESTRAINT SYSTEM
“AIRBAG”
Airbag system wiring harness is routed near the
TPM control module.
CAUTION:
• All airbag system wiring harnesses are yel-
low. Do not use the electrical test equipment on
these circuits.
• Be careful not to damage the airbag system
wiring harness when servicing the tire pressure
monitoring control module.
2. TIRE PRESSURE MONITORING
CONTROL MODULE
• If the transmitter is replaced, ID registration for
the transmitter is required. <Ref. to TPM(diag)-10,
REGISTER TRANSMITTER ID, OPERATION,
Subaru Select Monitor.>
• When adjusting tire pressure indoors in winter,
there is a big temperature difference between the
indoor facilities and outside. Once the car is outside
where the temperature is lower, the air pressure in
the tires will drop, causing the tire pressure warning
light to illuminate, even if the pressure in the tires
was adjusted to standard values indoors. To avoid
this, it is necessary to adjust the tire pressure to the
high side in consideration of the difference in tem-
perature between inside and outside according to
the following table.
a. 215/45ZR17
b. 215/45R18 and P215/45R18, P205/50R17
c. P225/60R16 and P225/55R17
B: INSPECTION
Before performing diagnosis, check the following
item which might affect the quality of the tire pres-
sure monitoring system.
1. TIRE
• Inspect that the tire pressure is within the speci-
fication while the tire is cool. (Refer to Tire Caution
Label.)
• Check the tires for damage or the insertion of for-
eign matters.
2. BATTERY
Check that amount of battery fluid, gravity and volt-
age are within the specifications.
Standard voltage: 12 V or more
Specific gravity: 1.260 or more
Temperature
°C (°F)
Indoor
temperature
15.5 (60)
Ambient
temperature
–1 (30)
–12 (10)
–23 (–10)
Air
pressure
kPa (psi)
Front
265 (38)
280 (40)
295 (42)
Rear
250 (36)
265 (38)
280 (40)
Temperature
°C (°F)
Indoor
temperature
15.5 (60)
Ambient
temperature
–1 (30)
–12 (10)
–23 (–10)
Air
pressure
kPa (psi)
Front
250 (36)
265 (38)
280 (40)
Rear
240 (35)
255 (37)
270 (39)
Temperature
°C (°F)
Indoor
temperature
15.5 (60)
Ambient
temperature
–1 (30)
–12 (10)
–23 (–10)
Air
pressure
kPa (psi)
Front
240 (35)
255 (37)
270 (39)
Rear
230 (33)
245 (35)
260 (37)
TPM(diag)-4
General Description
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
C: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
1B022XU0
SUBARU SELECT
MONITOR III KIT
Used for troubleshooting the electrical system.
TOOL NAME
REMARKS
Circuit tester
Used for measuring resistance, voltage and current.
Transmitter registration tool
Used to register the transmitter ID. Manufacturer: Kent-Moore
Item number: J45295
ST1B022XU0
TPM(diag)-5
Electrical Component Location
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS)
3. Electrical Component Location
A: LOCATION
(1)
Tire pressure monitoring control
module
(2)
Tire pressure warning light
(3)
Snap-in type transmitter
TPM00029
(2)
(1)
(3)
(3)
(1)
TPM00002
TPM00003
(2)
(3)
TPM00049
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