Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 481

TIRE PRESSURE MONITORING SYSTEM

(DIAGNOSTICS)

TPM(diag)

Page

1.

Basic Diagnostic Procedure . . . . . . . . . . . . . . . . . ...2

2.

General Description . . . . . . . . . . . . . . . . . . . . ...3

3.

Electrical Component Location . . . . . . . . . . . . . . . . ..5

4.

Control Module I/O Signal . . . . . . . . . . . . . . . . . . ..6

5.

Subaru Select Monitor . . . . . . . . . . . . . . . . . . . . 7

6.

Read Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . .12

7.

Inspection Mode . . . . . . . . . . . . . . . . . . . . . ...13

8.

Clear Memory Mode . . . . . . . . . . . . . . . . . . . . .14

9.

Tire Pressure Warning Light / Trouble Indicator Light Illumination Pattern ...15

10.

List of Diagnostic Trouble Code (DTC) . . . . . . . . . . . . . 20

11.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) . . . . . 22

12.

General Diagnostic Table . . . . . . . . . . . . . . . . . . .32

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 TPMS & keyless entry control module connec-

tor when removing and 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)-10, COMMUNICATION FOR INI-
TIALIZING IMPOSSIBLE, INSPECTION, Sub-
aru Select Monitor.>
4) Read the DTC. <Ref. to TPM(diag)-12,
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)-32,
General Diagnostic Table.>
2) Perform the Clear Memory Mode. <Ref. to
TPM(diag)-8, CLEAR MEMORY, OPERATION,
Subaru Select Monitor.>
3) Perform the Inspection Mode. <Ref. to
TPM(diag)-13, Inspection Mode.>
4) Read the DTC. <Ref. to TPM(diag)-7, 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 the tire infla-
tion pressure
warning light blink-
ing patterns. <Ref.
to TPM(diag)-15,
INSPECTION, Tire
Pressure Warning
Light / Trouble Indi-
cator Light Illumi-
nation Pattern.>

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)-8, 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)-7, 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. SRS AIRBAG SYSTEM

Airbag system wiring harness is routed near the

TPM control module.
CAUTION:

• Do not use electrical test equipment on any

of the airbag system wiring harness circuits.

• Be careful not to damage the wiring harness

of the airbag system when servicing the TPMS

& keyless entry control module.

2. TPMS & KEYLESS ENTRY CONTROL

MODULE

• If the transmitter is replaced, ID registration for

the transmitter is required. <Ref. to TPM(diag)-9,

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.

235/45R17, 245/40R18

B: INSPECTION

Before performing diagnosis, check the following

item which might affect the quality of the tire pres-

sure monitoring system.

1. TIRES

• 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 tem-

perature

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)

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