Code No. C1913: Acceleration sensor, Tyre1
Code No. C1923: Acceleration sensor, Tyre2
Code No. C1933: Acceleration sensor, Tyre3
Code No. C1943: Acceleration sensor, Tyre4
Code No. C1914: Tyre air pressure sensor, Tyre1
Code No. C1924: Tyre air pressure sensor, Tyre2
Code No. C1934: Tyre air pressure sensor, Tyre3
Code No. C1944: Tyre air pressure sensor, Tyre4
Code No. C1916: Temperature sensor, Tyre1
Code No. C1926: Temperature sensor, Tyre2
Code No. C1936: Temperature sensor, Tyre3
Code No. C1946: Temperature sensor, Tyre4
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| caution |
- When diagnosis code No. C1913, C1923, C1933, C1943, C1914, C1924, C1934, C1944, C1916, C1926, C1936 or C1946 is set, be sure to diagnose the CAN bus line.
- When replacing the ECU, always check that the communication circuit is normal.
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Code No. C1913, C1923, C1933, C1943
- The TPMS transmitter detects if the wheel is rotated by the acceleration sensor and sends the signals to ETACS-ECU <Vehicles without KOS> or KOS-ECU. When the TPMS transmitter judges that the acceleration sensor is failed, the failure signal is send to ETACS-ECU <Vehicles without KOS> or KOS-ECU, and ETACS-ECU <Vehicles without KOS> or KOS-ECU sets this code.
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Code No. C1914, C1924, C1934, C1944
- The TPMS transmitter detects if the tyre pressure sensor is normal and sends the signal to ETACS-ECU <Vehicles without KOS> or KOS-ECU. When the TPMS transmitter judges that the tyre pressure sensor is failed, the failure signal is send to ETACS-ECU <Vehicles without KOS> or KOS-ECU, and ETACS-ECU <Vehicles without KOS> or KOS-ECU sets this code.
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Code No. C1916, C1926, C1936, C1946
- The TPMS transmitter detects if the tyre temperature sensor is normal and sends the signal to ETACS-ECU <Vehicles without KOS> or KOS-ECU. When the TPMS transmitter judges that the tyre temperature sensor is failed, the failure signal is send to ETACS-ECU <Vehicles without KOS> or KOS-ECU, and ETACS-ECU <Vehicles without KOS> or KOS-ECU sets this code.
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- Malfunction of CAN bus line
- Low battery that is incorporated into the TPMS transmitter
- Damaged wiring harness and connector
- Malfunction of TPMS transmitter
- Malfunction of ETACS-ECU <Vehicles without KOS> or KOS-ECU
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STEP 1. 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 3.
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 Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting). On completion, go to Step 2.
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STEP 2. Check whether the diagnosis code is set again.
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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code 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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| note |
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 to 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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(1)Turn the ignition switch (engine starting switch) from the "LOCK" (OFF) to "ON" position.
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(2)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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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 start over at Step 1.
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The procedure is complete.
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