Code No. C1902: Reset fail (warning threshold)


caution 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 ).

DIAGNOSTIC FUNCTION


When a tyre inflation pressure warning threshold value cannot be reset due to a timeout (10 minutes or more have passed in total at 35 km/h or more), the ETACS-ECU will set a diagnosis code.

TROUBLESHOOTING HINTS


The most likely causes for this diagnosis code to be set are:

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis.
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines.
Recheck if diagnosis code No. C1902 is set.
(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2)Check if the diagnosis code is set.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the diagnosis code set?
Go to Step 3.
The procedure is complete.

STEP 3. Check whether the diagnosis code is set.
Recheck if the diagnosis code is set.
(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2)Check if the diagnosis code is set.

Q. Are diagnosis code Nos. C1911, C1921, C1931, C1941 and C1951 set?
Press the multi-information display switch to toggle tyre ID sets. Then perform TPMS TRANSMITTER CHECK (Toggling the tyre ID set will trigger the reset function automatically. Then the TPMS warning lamp will start flashing slowly. Furthermore, diagnosis code Nos. C1911, C1921, C1931, C1941 and C1951 will be set as "stored"). Then go to Step 4.
Go to Step 7.

STEP 4. Check the tyre IDs for the TPMS transmitters.
Could all the tyre IDs for the TPMS transmitters be confirmed?

Q. Is the check result normal?
Adjust the tyre inflation pressure to the recommended value. Then road test for a while to complete the reset function. Then go to Step 6.
Go to Step 5.

STEP 5. Check the tyre IDs for the TPMS transmitters.
Could any of the tyre IDs for the TPMS transmitters be confirmed?

Q. Is the check result normal?
Register the applicable IDs to the ECU as the active tyre ID set (Refer to ). Then go to Step 8.
Register applicable IDs to the ECU as the previous ID set (Refer to ). Then go to Step 8.

STEP 6. Check the reset function.
Check whether the reset function has been completed normally.

Q. Has the reset function been completed normally?
The procedure is complete (The incorrect tyre ID set has been activated, and this is not a malfunction).
If the reset function has not been completed after 10 minute road test, register applicable IDs as the active tyre ID set (Refer to ). Then go to Step 8.

STEP 7. Check for TPMS transmitter.
Identify the TPMS transmitter which the diagnosis code is set by TPMS transmitter check (Refer to ).
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.

Q. Are there any TPMS transmitters which are identified?
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 8.
Even when no transmitter is checked, register the ID codes (Refer to ). Then go to Step 8.

STEP 8. Check whether the diagnosis code is set again.
Recheck if the diagnosis code is set.
(1)Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2)Check if the diagnosis code is set.

Q. Is diagnosis code C1902 set?
Replace the TPMS receiver and register the ID codes. Then start over at Step 1.
The procedure is complete.