If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
DTC SET CONDITION
DTC C1910, C1920, C1930, C1940
When the reception abnormality warning is activated because of the low battery voltage of the TPMS transmitter.
DTC C1911, C1921, C1931, C1941
When WCM cannot receive the signals from the TPMS transmitters while driving for about 20 minutes, this code is set.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to 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 WCM
DIAGNOSIS
Required Special Tools:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: M.U.T.-III USB Cable
MB991910: M.U.T.-III Main Harness A
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
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. Diagnostic trouble code recheck after resetting CAN bus lines
Is the DTC C1910, C1920, C1930, C1940, C1911, C1921, C1931 or C1941 set?
Go to Step 3.
The procedure is complete.
STEP 3. Check for TPMS transmitter.
Identify the TPMS transmitter which the DTC 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.
Are there any TPMS transmitters which are identified?
Among the checked TPMS transmitters, replace the TPMS transmitters to which the DTC is set. Then register the ID codes (Refer to ). Then go to Step 4.
Even when no transmitter is checked, register the ID codes (Refer to ). Then go to Step 4.
STEP 4. Diagnostic trouble code recheck after register the ID codes
(1) Turn the power supply mode of the engine switch to OFF.
(2) Turn the power supply mode of the engine switch to ON.
(3) Check if the DTC is set.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC C1910, C1920, C1930, C1940, C1911, C1921, C1931 or C1941 set?
Replace the WCM and register the ID codes (Refer to ). Then start over at Step 1.