Mitsubishi Montero (2004+). Manual — part 500

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

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WHEEL AND TIRE

31-71

STEP 11. Check the following harness wire.

• The wire between combination meter connector D-04 (ter-

minal 41) and TPMS receiver connector G-28 (terminal 7)

Q: Is the harness wire damaged?

YES : Repair or replace it. And then go to Step 12.
NO : Replace the combination meter case (Refer to

P.54A-78

). And then go to Step 12.

STEP 12. Retest the system.

Q: Turn the ignition switch to the "ON" position. Does the

TPMS warning light illuminate for three seconds, and
then go out?
YES : The procedure is complete.
NO : Repeat the troubleshooting from Step 1.

AC204170

CONNECTOR : D-04

AD

D-04(GR)

HARNESS
SIDE

D-04(GR)

31

32

41 40

33

34

36

37

35

43

46 45 44

39

42

38

47

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G-28

AF

G-28

10

5

6

7

9 8

3

4

2 1

HARNESS CONNECTOR:
COMPONENT SIDE

CONNECTOR: G-28

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TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

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WHEEL AND TIRE

31-72

INSPECTION PROCEDURE 4: In Spite of Abnormally Low Tire Pressure at a Road Wheel, the TPMS
Warning Light does not Illuminate.

.

SYSTEM OPERATION
The TPMS warning light will illuminate when the igni-
tion switch is turned to the "ON" position if tire pres-
sure of any road wheel is low.
NOTE: As long as the spare tire is not being used as
a road wheel tire, the TPMS does not warn the driver
even if the spare tire inflation pressure has
decreased.

.

TECHNICAL DESCRIPTION (COMMENT)

• The TPMS may not detect a failure if the TPMS

transmitter does not send timely information or
there is any interference with the antenna.

• The tire pressure sensor or roll switch inside the

TPMS transmitter may be inaccurate or defective.
In this case, the TPMS may not detect a failure.

.

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

• The TPMS transmitter does not send timely infor-

mation or there is any interference with the
antenna.

• Damaged harness wire or connector

• Malfunction of the combination meter

• Malfunction of the TPMS transmitter

• 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

.

STEP 1. Check the TPMS warning light.

Check whether the TPMS warning light illuminates for three
seconds after the ignition switch is turned to the "ON" position.
Q: Does the TPMS warning light illuminate for three

seconds?
YES : Check that the TPMS warning light illuminates for

three seconds and then go out. And then go to Step 2.

NO : Go to TPMS Inspection Procedure No.3 "The TPMS

Warning Light does not Illuminate as a Bulb Check for
Three Seconds when the Ignition Switch is Turned to
the "ON" Position" (Refer to

P.31-59

).

AC205999

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TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

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WHEEL AND TIRE

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STEP 2. Using scan tool MB991958, read the diagnostic
trouble code.

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.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check whether DTC 23, 27, 32, 36 or 41 (TPMS transmitter

abnormality

− Tire air pressure low) is set.

NOTE: If DTC23, 27, 32, 36 or 41 is set, the TPMS receiver
is defective. In Step 1, the TPMS warning light illuminated
for three seconds and then went out. However, the DTC is
set. This means that a contradiction has arisen in the
receiver operation.

Q: Is DTC 23, 27, 32, 36 or 41 (TPMS transmitter

abnormality

− Tire air pressure low) set?

YES : Replace the TPMS receiver (Refer to

P.31-96

). And

then go to Step 15.

NO : Go to Step 3.

STEP 3. Execute "Tire Pressure Sensor ID Check" and
"Tire Pressure Sensor Check" on scan tool MB991958
"Special Function."
(1) Execute "Tire Pressure Sensor ID Check" on scan tool

MB991958 "Special Function" (Refer to

P.31-90

), and make

a note of all the registered tire pressure sensor IDs.
NOTE: This note is needed when you check the registered
IDs.

(2) Execute "Tire Pressure Sensor Check" on scan tool

MB991958 "Special Function" for the relevant road tire

(Refer to

P.31-91

).

(3) Confirm the tire inflation pressure and tire pressure sensor

ID, which are shown on scan tool MB991958 display.

Q: Are the tire inflation pressure and tire pressure sensor

ID displayed?
YES : Go to Step 4.
NO : It is judged that the TPMS could not detect abnormal

reception due to a defective TPMS transmitter.
Replace the relevant TPMS transmitter (Refer to

P.31-97

). And then go to Step 15.

AC306409AF

MB991911

MB991824

MB991827

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

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WHEEL AND TIRE

31-74

STEP 4. Check the tire pressure sensor ID, which is shown
on scan tool MB991958 display.

Compare the tire pressure sensor ID shown on scan tool
MB991958 with the tire pressure sensor ID noted at Step 3.
Q: Is the tire pressure sensor ID shown on scan tool

MB991958 the same as the noted ID?
YES : Go to Step 5.
NO : Go to Step 15.

STEP 5. Check the tire pressure, which is shown on scan
tool MB991958 display.
Q: Is the shown tire inflation pressure less than the

threshold value (158 kPa, 23.0 psi)?
YES : Go to Step 7.
NO : Go to Step 6.

STEP 6. Use an accurate tire pressure gauge to measure
the relevant road tire inflation pressure.

Compare the actually measured value with the value shown on
scan tool MB991958 to determine whether the TPMS transmit-
ter pressure sensor is inaccurate.
NOTE: In areas where atmospheric pressure is low (such as
high altitude), scan tool MB991958 value will reduce accord-
ingly. This is not a failure. For your reference, the value reduces
approximately 3.5 kPa (0.5 psi) for every 305 meters (1,000
feet).
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 : The procedure is complete.
NO : Replace the TPMS transmitter of the relevant road tire

(Refer to

P.31-97

). And then go to Step 15.

STEP 7. Check the illumination condition of the TPMS
warning light.

Turn the ignition switch to the "ON" position. Check that the
TPMS warning light illuminates for three seconds, goes out
momentarily, and then illuminates again.
Q: Does the TPMS warning light illuminate again?

YES : Go to Step 8.
NO : Go to Step 9.

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