Subaru Legacy IV (2008 year). 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.