Mitsubishi Montero (2004+). Manual - part 501

TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-75

STEP 8. Check the relevant road tire for improper inflation 
pressure or any other problems, and make necessary 
repairs. Then drive the vehicle and check if the TPMS 
warning light comes on.

(1) If the relevant road tire has been punctured, repair it. If the 

valve grommet or valve core is defective, replace it (Refer 
to 

P.31-97

).

(2) Adjust the relevant road tire inflation pressure to the value 

specified on the tire pressure label.

(3) Drive the vehicle, and check that the TPMS warning light 

goes out within 10 minutes after the vehicle speed reaches 
30 km/h (19 mph).

Q: Does the TPMS warning light go out?

YES : The procedure is complete. (For some reason, the 

TPMS transmitter could not communicate with the 
TPMS receiver momentarily).

NO :  The roll switch of the TPMS transmitter may be 

defective. Replace the TPMS transmitter of the 
relevant road tire (Refer to 

P.31-97

). And then go to 

Step 15 .

STEP 9. Using scan tool MB991958, read the diagnostic 
trouble code.

Check whether DTC 23, 27, 32, 36 or 41 (TPMS transmitter 
abnormality 

− Tire air pressure low) is set.

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 10.

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TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-76

STEP 10. Reproduce the abnormal condition, and check 
the TPMS warning light.

(1) Adjust all the tire inflation pressures (including spare tire) to 

the value specified on the tire pressure label.

(2) Drive the vehicle at 30 km/h (19 mph) or higher.

CAUTION

You can stop the vehicle momentarily when you drive it for 
15 minutes.
(3) Then drive the vehicle continuously for 15 minutes at 100 

km/h (62 mph) or lower.

(4) Stop the vehicle, and use a tire pressure gauge to reduce 

the relevant road tire inflation pressure to 138 kPa (20.1 psi) 
i.e. 20 kPa (2.9 psi) lower than the threshold value.

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

MB991958 "Special Function" for the relevant road tire 
(Refer to 

P.31-91

).

(6) Check that the value shown on scan tool MB991958 is 

lower than the threshold value.

Threshold value: 158 kPa (23.0 psi)

(7) Check the illumination condition of the TPMS warning light.
Q:  Does the TPMS warning light illuminate?

YES : Go to Step 11.
NO :  Execute "Tire Pressure Sensor ID Registration on 

scan tool MB991958 "Special Function" (Refer to 

P.31-89

). And then go to Step 12.

STEP 11. Adjust the relevant road tire inflation pressure, 
and check that the TPMS warning light goes out.

When the abnormal condition was reproduced in Step 10, the 
TPMS warning light illuminated. Therefore, the TPMS can be 
determined to be normal. The TPMS receiver could not detect 
the road wheels after tire rotation. Check that the TPMS warn-
ing light goes out as follows:
(1) Wait until the tires cool down, and adjust the relevant road 

tire inflation pressure to the value specified on the tire 
pressure label.

(2) Use a magnet to force the TPMS transmitter to send a 

signal. The signal sending procedure is the same as 
executing "Tire Pressure Sensor Check" on scan tool 

MB991958 "Special Function" (Refer to 

P.31-91

).

NOTE: By forcing the TPMS transmitter to send a signal, 
the transmitter informs the TPMS receiver of the correct tire 
inflation pressure. Then the warning light should go off.

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TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

TSB Revision

WHEEL AND TIRE

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(3) Check that the TPMS warning light is off.
Q:  Does the TPMS warning light remain off?

YES : The procedure is complete.
NO :  Repeat this Step.

STEP 12. 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 13.
NO :  Replace the TPMS receiver (Refer to 

P.31-96

). And 

then go to Step 15.

STEP 13. Using scan tool MB991958, read the diagnostic 
trouble code.

Check whether DTC 23, 27, 32, 36 or 41 (TPMS transmitter 
abnormality 

− Tire air pressure low) is set.

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

abnormality 

− Tire air pressure low) set?

YES : The TPMS receiver could not detect the road wheels 

after tire rotation. Wait until the tires cool down, and 
adjust the relevant road tire inflation pressure to the 
value specified on the tire pressure label. And then go 
to Step 14.

NO :  Replace the TPMS receiver (Refer to 

P.31-96

). And 

then go to Step 15.

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TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS

TSB Revision

WHEEL AND TIRE

31-78

STEP 14. Using scan tool MB991958, check data list item 
04: VSS (Vehicle Speed Signal).

(1) Check the following data list.

• Item 04: VSS (Vehicle Speed Signal)

(2) Drive the vehicle at 30 km/h (19 mph) or more, and 

compare the value shown on scan tool MB991958 with the 
speedometer in the combination meter.

Q: Does the vehicle speed shown on scan tool MB991958 

correspond to that on the speedometer?
YES : The roll switch in the TPMS transmitter may be 

defective. Replace the TPMS transmitter of the 
relevant road tire (Refer to 

P.31-97

). And then go to 

Step 15 .

NO :  Carry out troubleshooting for DTC 14 (TPMS 

abnormality 

− Vehicle speed signal) (Refer to 

P.31-23

).

STEP 15. Tire pressure sensor ID registration and TPMS 
check
(1) Execute "Tire Pressure Sensor ID Registration" on scan 

tool MB991958 "Special Function" when the relevant road 

tire inflation pressure is lower than 138 kPa (20.1 psi) 
(Refer to 

P.31-89

).

(2) Check whether the TPMS warning light illuminates and 

DTC 23, 27, 32, 36 or 41 (TPMS transmitter abnormality 

− 

Tire air pressure low) is set.

(3) If the relevant road tire has been punctured, repair it. If the 

valve grommet or valve core is defective, replace it (Refer 
to 

P.31-97

).

(4) Wait until the road tires cool down, and adjust the relevant 

road tire inflation pressure to the value specified on the tire 
pressure label.

(5) Use a magnet to force the TPMS transmitter to send a 

signal. The signal sending procedure is the same as 
executing "Tire Pressure Sensor Check" on scan tool 
MB991958 "Special Function" (Refer to 

P.31-91

).

NOTE: By forcing the TPMS transmitter to send a signal, 
the transmitter informs the TPMS receiver of the correct tire 
inflation pressure. Then the warning light should go off.

(6) Check that the TPMS warning light is off.
Q:  Does the TPMS warning light remain off?

YES : The procedure is complete.
NO :  Repeat this Step..

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