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