Inspection Procedure
1: The TPMS warning lamp stays ON.
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- If there is any problem in the
CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the
CAN bus lines (Refer to GROUP 54C -
CAN Bus Diagnostics Table).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
- The TPMS warning lamp will illuminate when the ECU detects that the tyre
inflation pressure of road wheel is below 204 kPa or a certain threshold value.
- Furthermore, the TPMS warning lamp illuminates for 3 seconds immediately after the
ignition switch (engine starting switch) is turned to the "ON" position. This is a bulb check
of the TPMS warning lamp.
COMMENT ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line, combination meter or ETACS-ECU <Vehicles
without KOS>
or KOS-ECU.
PROBABLE CAUSES
- Damaged wiring harness and connectors
- Low tyre inflation pressure
- Punctured tyre
- Damaged tyre valve and/or valve core
- Inaccurate tyre pressure sensor of the TPMS transmitter
- Malfunction of the combination meter
- Malfunction of the ETACS-ECU <Vehicles without KOS>
or KOS-ECU
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STEP 1. Inspect the all tyres.
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Visually check road tyres for any sign of air leak or puncture.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Replace the valve or valve core, or repair the flat tyre. Replace the tyre if
necessary. Then go to Step 2.
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STEP 2. After the tyre inflation pressure is adjusted and the TPMS
transmitter sends inflation pressure information on it, check the TPMS warning lamp.
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(1)Wait until the tyres cool down, and adjust road tyre inflation pressures to the
value specified on the tyre pressure label.
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(2)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON"
position.
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(3)Drive the vehicle for 5 minutes.
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(4)Check the TPMS warning lamp.
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Q.
Is the TPMS warning lamp turned off?
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The procedure is complete.
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Go to Step 3.
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STEP 3. Check the tyre inflation pressure again.
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Use a tyre pressure gauge to check that road tyre inflation pressures meet the value specified
on the tyre pressure label.
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Q.
Is the check result normal?
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Go to Step 4.
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Replace the valve or valve core, or repair the damaged tyre. Replace the tyre
if necessary. Then return to Step 2.
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STEP 4. M.U.T.-III CAN bus diagnostics
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the CAN bus lines (Refer to GROUP 54C -
CAN Bus Diagnostics Table).
Then go to Step 5.
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STEP 5. Check whether the diagnosis code is set.
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Use M.U.T.-III to check whether diagnosis code No. C1912, C1922, C1932 or C1942 (Tyre
air pressure low) is set.
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Q.
Is diagnosis code No. C1912, C1922, C1932 or C1942 set?
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Carry out troubleshooting for diagnosis codes No. C1912/C1922/C1932/C1942
(Tyre air pressure low) (Refer to  ).
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Replace the KOS-ECU (Refer to GROUP 42B -
KOS-ECU ) <Vehicles
without KOS> or ETACS-ECU (Refer to GROUP 54A -
ETACS-ECU )
and register the ID codes. Then go to Step 6.
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STEP 6. Check the TPMS warning lamp.
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Q.
Does the TPMS warning lamp turn OFF after 3 seconds of initial lamp check?
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Go to Step 7.
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Replace the combination meter assembly (Refer to GROUP 54A -
Combination
Meter Assembly). Then go to Step 7.
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STEP 7. Retest the system.
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Q.
Does the TPMS warning lamp turn ON and OFF normally?
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The procedure is complete.
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Repeat the troubleshooting from Step 1.
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