Code No. C1910: Transmitter battery voltage tyre1
Code No. C1920: Transmitter battery voltage tyre2
Code No. C1930: Transmitter battery voltage tyre3
Code No. C1940: Transmitter battery voltage tyre4
Code No. C1911: Tyre ID reception fail tyre1
Code No. C1921: Tyre ID reception fail tyre2
Code No. C1931: Tyre ID reception fail tyre3
Code No. C1941: Tyre ID reception fail tyre4
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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  ).
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DIAGNOSTIC FUNCTION
Codes No. C1910, C1920, C1930, C1940
- When the reception abnormality warning is activated because of the low battery voltage of the TPMS transmitter.
Codes C1911, C1921, C1931, C1941
- When ETACS-ECU <Vehicles without keyless operation system> or KOS-ECU <Vehicles with keyless operation system> cannot receive the signals from the TPMS transmitters while driving for about 20 minutes, these codes are set.
PROBABLE CAUSES
The most likely causes for this diagnosis code to be set are:
- Low battery that is incorporated into the TPMS transmitter
- Damaged wiring harness and connector
- Registered IDs unmatched
- Malfunction of TPMS transmitter
- Malfunction of ETACS-ECU <Vehicles without keyless operation system>
- Malfunction of KOS-ECU <Vehicles with keyless operation system>
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the 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 2.
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 Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Recheck if any of diagnosis codes No. C1910, C1911, C1920, C1921, C1930, C1931, C1940 and C1941 is set.
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(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis codes are set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Are the diagnosis codes set?
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Go to Step 3.
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The procedure is complete.
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STEP 3. Check for TPMS transmitter.
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Identify the TPMS transmitter which the diagnosis code is set by TPMS transmitter check (Refer to ).
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The TPMS transmitter which cannot be checked may be faulty or the ID code may not be registered, thus do not replace it, but register the ID code. If the transmitter is faulty, it is replaced in the ID code registration process.
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Q.
Are there any TPMS transmitters which are identified?
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Among the checked TPMS transmitters, replace the TPMS transmitters in which the diagnosis code is set. Then register the ID codes (Refer to ). Then go to Step 4.
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Even when no transmitter is checked, register the ID codes (Refer to ). Then go to Step 4.
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STEP 4. Check whether the diagnosis code is set again.
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Recheck if the diagnosis code is set.
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(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. C1910, C1911, C1920, C1921, C1930, C1931, C1940 or C1941 set?
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Replace the ETACS-ECU <Vehicles without keyless operation system> (Refer to ) or KOS-ECU. <Vehicles with keyless operation system> (Refer to GROUP 42B, KOS-ECU ), and register the ID codes (Refer to ). Then start over at Step 1.
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The procedure is complete.
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