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DTC C1912: Tire air pressure low, Tire1
DTC C1922: Tire air pressure low, Tire2
DTC C1932: Tire air pressure low, Tire3
DTC C1942: Tire air pressure low, Tire4
 
 
cautionIf there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
 
 
DTC SET CONDITION
When the tire pressure included in the signal from the TPMS transmitter is less than the specified value, ETACS-ECU <Vehicles without Keyless Operation System> or KOS&OSS-ECU <Vehicles with Keyless Operation System> sets this code.
 
 
TROUBLESHOOTING HINTS
The most likely causes for this DTC to be set is:
  • Drop of tire pressure.
  • Flat tire.
  • The TPMS transmitter may be faulty.
  • The ETACS-ECU may be faulty. <Vehicles without Keyless Operation System>
  • The KOS&OSS-ECU may be faulty. <Vehicles with Keyless Operation System>
  • The CAN-bus line may be faulty.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. DTC recheck after repairing CAN bus lines.
Recheck if DTC C1912, C1922, C1932 or C1942 is set.
(1) Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC C1912, C1922, C1932 or C1942 set?
Go to Step 3.
The procedure is complete.
 
STEP 3. Tire check.
Check that there is no abnormality for the items below.
  • Flat tire
  • Cracked tire
  • Air leak from valve
Is the check result normal?
Go to Step 4.
Replace or repair it. Then go to Step 4.
 
STEP 4. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Turn the ignition switch to the" LOCK" (OFF) to "ON" position, and adjust the pressure to the recommended tire pressure.
(2) Check if the DTC is set.
Is DTC C1912, C1922, C1932 or C1942 set?
Go to Step 5.
The procedure is complete.
 
STEP 5. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Drive the vehicle for 5 minutes.
noteEven within 5 minutes, if the TPMS warning light goes out, finish the driving and perform the operation (2).
(2) Check if the DTC is set.
Is DTC C1912, C1922, C1932 or C1942 set?
Go to Step 6.
The procedure is complete.
 
STEP 6. Tire pressure check by scan tool.
(1) Perform the transmitter check using the scan tool (Refer to ), and check the tire pressure values of all the wheels.
(2) Check the tire pressure of all the wheels using the tire pressure gauge.
(3) Compare the measured value (1) with (2).
OK: 20 kPa (2.9 psi) or less
noteThe 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 replace in the ID code registration process.
Is the check result normal?
Replace the ETACS-ECU <Vehicles without Keyless Operation System> (Refer to GROUP 54A - ETACS ) or KOS&OSS-ECU <Vehicles with Keyless Operation System> (Refer to GROUP 42B - KOS&OSS-ECU ), and register the ID codes (Refer to ). Then go to Step 8.
Replace the TPMS transmitter (Refer to ), and register the ID codes (Refer to ). Then go to Step 7.
 
STEP 7. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC C1912, C1922, C1932 or C1942 set?
Replace the ETACS-ECU <Vehicles without Keyless Operation System> (Refer to GROUP 54A - ETACS ) or KOS&OSS-ECU <Vehicles with Keyless Operation System> (Refer to GROUP 42B - KOS&OSS-ECU ) and register the ID codes (Refer to ). Then go to Step 8.
The procedure is complete.
 
STEP 8. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) to "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC C1912, C1922, C1932 or C1942 set?
Start over at Step 1.
The procedure is complete.