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Inspection Procedure 1: The TPMS warning light stays ON.
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC 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.
 
 
OPERATION
  • The TPMS warning light will illuminate when the tire inflation pressure of road wheel is below 189 kPa (27.4 psi) or a certain threshold value.
  • 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.
 
 
 
COMMENT ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line, combination meter or ETACS-ECU <vehicles without Keyless Operation System> or KOS&OSS-ECU <vehicles with Keyless Operation System>.
 
 
 
PROBABLE CAUSES
  • Damaged wiring harness and connectors.
  • Low tire inflation pressure.
  • Punctured tire.
  • Damaged tire valve and/or valve core.
  • Inaccurate tire pressure sensor of the TPMS transmitter.
  • The combination meter may be faulty.
  • The ETACS-ECU <vehicles without Keyless Operation System> or the KOS&OSS-ECU may be faulty. <vehicles with Keyless Operation System>
 
 
 
 
DIAGNOSIS
STEP 1. Inspect the all tires.
Visually check road tires for any sign of air leak or puncture.
Is the check result normal?
Go to Step 2.
Replace the valve or valve core, or repair the flat tire. Replace the tire if necessary. Then go to Step 2.
 
STEP 2. After the tire inflation pressure is adjusted and the TPMS transmitter sends inflation pressure information on it, check the TPMS warning light.
(1) Wait until the tires cool down, and adjust road tire inflation pressures to the value specified on the tire pressure label.
(2) Turn the ignition switch to the "ON" position.
(3) Drive the vehicle for five minutes.
(4) Check the TPMS warning light.
Is the TPMS warning light turned off?
The procedure is complete.
Go to Step 3.
 
STEP 3. Check the tire inflation pressure again.
Use a tire pressure gauge to check that road tire inflation pressures meet the value specified on the tire pressure label.
Is the check result normal?
Go to Step 4.
Replace the valve or valve core, or repair the damaged tire. Replace the tire if necessary. Then return to Step 2.
 
STEP 4. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 5.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). Then go to Step 5.
 
STEP 5. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
Use scan tool (M.U.T.-III) to check whether DTC C1912, C1922, C1932 or C1942 (Tire air pressure low) is set.
Is DTC C1912, C1922, C1932 or C1942 set?
Carry out troubleshooting for DTC C1912, C1922, C1932 or C1942 (Tire air pressure low) (Refer to ).
Replace the ETACS-ECU <vehicles without Keyless Operation System> or KOS&OSS-ECU <vehicles with Keyless Operation System> (Refer to ) and execute "Tire Pressure Sensor ID Registration" on scan tool (M.U.T.-III) "Special Function" (Refer to ). Then go to Step 6.
 
STEP 6. Check the TPMS warning light.
Does the TPMS warning light turn OFF after three seconds of initial lamp check?
Go to Step 7.
Replace the combination meter assembly (Refer to GROUP 54A - Combination Meter Assembly). Then go to Step 7.
 
STEP 7. Retest the system.
Does the TPMS warning light turn ON and OFF normally?
The procedure is complete.
Repeat the troubleshooting from Step 1.