C1940

DTC C1910/C1920/C1930/C1940: TPMS Transmitter Abnormality (Transmitter Battery Voltage)

TPMS DTC SET CONDITION
DTC C1910, C1920, C1930 or C1940 is set if the battery in the TPMS transmitter is discharged. At the same time this DTC is set, the TPMS warning light flash for about 1 minute and then remain illuminated.

TROUBLESHOOTING HINT
Replace the TPMS transmitter if its battery is discharged.

NOTE: The battery cannot be removed from the TPMS transmitter. Nominal service life of the battery is 10 years or 160,000 km (100,000 miles).

DIAGNOSIS

NOTE: To help determine which TPMS transmitter is defective, make a note of the tire pressure sensor ID, which the DTC indicates, prior to the troubleshooting.

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. Execute "Tire Pressure Sensor Check" on scan tool MB991958 "Special Function."

CAUTION
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.





1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to the "ON" position.
3) Execute "Tire Pressure Sensor Check" for all the TPMS transmitter-fitted tires.
Q: Is information on the tire pressure sensor displayed on scan tool MB991958 after the TPMS transmitter is activated?
YES: Determine which TPMS transmitter is defective by using scan tool MB991958, and replace its TPMS transmitter. Then execute "Tire Pressure Sensor ID Registration". And then go to Step 2.
NO: Replace the TPMS transmitter, which is not activated. Then execute "Tire Pressure Sensor ID Registration". Then go to Step 2. (If the TPMS transmitter is not activated and no data is displayed, the TPMS transmitter battery is completely flat).

STEP 2. Recheck for the diagnostic trouble code.
Q: Does diagnostic trouble code C1910, C1920, C1930 or C1940 reset?
YES: Repeat the troubleshooting from Step 1.
NO: The procedure is complete.