Mitsubishi Montero (2004+). Manual — part 494

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-47

CAUTION

The system does not monitor inflation pressure of the tire,
which the TPMS receiver has recognized as a spare tire.
However, if the spare tire is not installed as shown (the
valve is not positioned as shown), the roll switch, which is
incorporated in the TPMS transmitter, may operate. In that
case, the system may determine the spare tire as a road
tire incorrectly. If the tire is recognized incorrectly and its
inflation pressure is low, the TPMS warning light will illu-
minate. To avoid this, always install the spare tire in a
specified position. Furthermore, even if the spare tire was
installed correctly, follow the diagnosis steps below.

.

STEP 1. Use an accurate tire pressure gauge to measure
the tire inflation pressure of all tires (including the spare
tire). Then execute "Tire Pressure Sensor Check" on scan
tool MB991958 "Special Function."
(1) Use an accurate tire pressure gauge to measure the tire

inflation pressure of all tires (including the spare tire), and

note the inflation pressures.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.
(4) Execute "Tire Pressure Sensor Check" for all the TPMS

transmitter-fitted tires (Refer to

P.31-91

).

Q: Is the tire inflation pressure shown on scan tool

MB991958 within

± 10 kPa (1.5 psi) from the actual

inflation pressure? <Ambient temperature during
measurement must be 0

− 50°C (32 − 122°F)>

YES : Adjust the tire inflation pressures to the value

specified on the tire pressure label. Then execute
"Tire Pressure Sensor Check" on scan tool
MB991958 "Special Function" (Refer to

P.31-91

) to

update the tire inflation pressure data on scan tool
MB991958. Make sure that the pressures displayed
on scan tool MB991958 correspond to the value
specified on the tire pressure label. Then go to Step 2.

NO : Replace the TPMS transmitter, where the tire

pressure sensor is inaccurate. Then execute "Tire
Pressure Sensor ID Registration" (Refer to

P.31-89

).

Then go to Step 3.

AC307590 AB

VALVE

AC306409AF

MB991911

MB991824

MB991827

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

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WHEEL AND TIRE

31-48

STEP 2. Recheck for diagnostic trouble code.
Q: Does diagnostic trouble code 23, 27, 32, 36 or 41 reset?

YES : Replace the TPMS receiver (Refer to

P.31-96

). On

completion, execute "Tire Pressure Sensor ID
Registration" on scan tool MB991958 "Special
Function" (Refer to

P.31-89

). Then go to Step 3.

NO : The procedure is complete.

STEP 3. Recheck for diagnostic trouble code.
Q: Does diagnostic trouble code 23, 27, 32, 36 or 41 reset?

YES : Repeat the troubleshooting from Step 1.
NO : The procedure is complete.

TPMS SYMPTOM CHART

M1311003100025

CAUTION

During diagnosis, a DTC code associated with another system may be set when the ignition switch is
turned to the "ON" position with connector(s) disconnected. when diagnosis is finished, check all
systems for DTC codes. If DTC code(s) are set, erase them all.

NOTE: Whenever the TPMS transmitters and/or
TPMS receiver are replaced with new ones, the tire
pressure sensor IDs must be registered into the
TPMS.
NOTE: The use of non-genuine wheels will cause
the improper installation of the TPMS transmitters,
possibly resulting in air leakage and damage to the
TPMS transmitter.
NOTE: TPMS may not work normally in the following
circumstances:

.

•

A wireless facility or device using the same fre-
quency with the TPMS transmitter is near the
vehicle.

•

Snow or ice is stuck inside the wheel houses and
/or on the wheels.

•

The TPMS transmitter’s battery is discharged.

•

Wheels other than Mitsubishi genuine wheels are
being used.

•

Wheels that are not fitted with TPMS transmitters
are being used.

•

Wheels whose tire pressure sensor IDs are not
registered by the vehicle are being used.

SYMPTOM

INSPECTION
PROCEDURE NO.

REFERENCE PAGE

The TPMS warning light stays on.

1

P.31-49

The TPMS warning light flashes.

2

P.31-55

The TPMS warning light does not illuminate as a bulb check for
three seconds when the ignition switch is turned to the "ON"
position.

3

P.31-59

In spite of abnormally low tire pressure at a road wheel, the
TPMS warning light does not illuminate.

4

P.31-72

Communication between the scan tool and the TPMS is not
possible.

5

P.31-79

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

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WHEEL AND TIRE

31-49

TPMS SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: The TPMS Warning Light Stays On.

.

COMBINATION
METER

TPMS
RECEIVER

TPMS Warning Light Signal Circuit

AC204170

CONNECTOR: D-04

EI

D-04 (GR)

AC204171

CONNECTOR : D-112

AU

AC307592

G-28

CONNECTOR: G-28

AD

THIRD SEAT
BELT (RH)

TPMS RECEIVER

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

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WHEEL AND TIRE

31-50

CIRCUIT OPERATION

• The TPMS warning light will illuminate when the

tire inflation pressure of any road wheel is below
158 kPa (23.0 psi).

• Furthermore, the TPMS warning light illuminates

for three seconds immediately after the ignition
switch is turned to the "ON" position. This is a
bulb check of the TPMS warning light.

.

TECHNICAL DESCRIPTION (COMMENT)
If the TPMS warning light illuminates for three sec-
onds after the ignition switch is turned to the "ON"
position, and does not go out, diagnose the signal
circuit of the TPMS warning light as follows (from
Step 6).

.

TROUBLESHOOTING HINTS (THE MOST LIKELY
CAUSES FOR THIS CASE:)

• Low tire inflation pressure

• Punctured tire

• Damaged tire valve grommet and/or valve core

• Inaccurate tire pressure sensor of the TPMS

transmitter

• TPMS warning light signal harness wire shorted

to ground

• Malfunction of the combination meter

• Malfunction of the TPMS receiver

.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

CAUTION

The system does not monitor inflation pressure of the tire,
which the TPMS receiver has recognized as a spare tire.
However, if the spare tire is not installed as shown (the
valve is not positioned as shown), the roll switch, which is
incorporated in the TPMS transmitter, may operate. In that
case, the system may determine the spare tire as a road
tire incorrectly. If the tire is recognized incorrectly and its
inflation pressure is low, the TPMS warning light will illu-
minate. To avoid this, always install the spare tire in a
specified position. Furthermore, even if the spare tire was
installed correctly, follow the diagnosis steps below.

.

STEP 1. Inspect the all tires.

Visually check all the tires for any sign of air leak or puncture.
Q: Are all the tires (including spare tire) in good condition?

YES : Go to Step 2.
NO : Replace the valve grommet or valve core, or repair

the flat tire. Replace the tire if necessary. And then go
to Step 2.

AC307590 AB

VALVE