Wireless Control Module
DTC C1914: Pressure Sensor Abnormality 1DTC C1924: Pressure Sensor Abnormality 2
DTC C1934: Pressure Sensor Abnormality 3
DTC C1944: Pressure Sensor Abnormality 4
CAUTION: 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.
TPMS DTC SET CONDITION
The TPMS transmitter detects if the tire pressure is normal and sends the signal to WCM. When the TPMS transmitter judges that the portion for detecting the tire pressure is failed, the failure signal is sent to WCM, and WCM sets this code.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
- Damaged wiring harness and connector.
- Malfunction of TPMS transmitter.
- Malfunction of WCM.
DIAGNOSIS
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 MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Check the registered ID by the transmitter ID check function, and detect the wheel to which the DTC is set by the transmitter check function. Then, replace the TPMS transmitter, and register the ID codes. Then go to Step 3.
NO : Repair the CAN bus lines. On completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines.
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code C1914, C1924, C1934 or C1944 set?
YES : Start over at Step 1.
NO : The procedure is complete.
STEP 3. Recheck for diagnostic trouble code.
1. Turn the ignition switch to the "LOCK" (OFF) position.
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code C1914, C1924, C1934 or C1944 set?
YES : Replace the WCM and register the ID codes. Then start over at Step 1.
NO : The procedure is complete.