DTC: C1821-78, C1822-78, C1823-78, C1824-78
DTC C1821-78 : Right-Front Tire Low Air Pressure DTC C1822-78 : Left-Front Tire Low Air Pressure DTC C1823-78 : Right-Rear Tire Low Air Pressure DTC C1824-78 : Left-Front Tire Low Air Pressure
If low tire pressure is detected, the TPMS control unit sets one or more of these DTCs, and turns on the low tire pressure/TPMS indicator and the appropriate tire indicator(s). If the low tire pressure/TPMS and tire indicators come on because of a low tire pressure, and the client corrects it before bringing the vehicle in, the DTCs will be stored, but all the indicators turn off.
| DTC Description | DTC |
|---|---|
| C1821-78 Right-Front Tire Low Air Pressure | |
| C1822-78 Left-Front Tire Low Air Pressure | |
| C1823-78 Right-Rear Tire Low Air Pressure | |
| C1824-78 Left-Front Tire Low Air Pressure |
DTC (TPMS)
- Problem verification
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Make sure the tires are inflated to the specified tire pressure listed on the doorjamb label.
- 3. Test-drive the vehicle.
Does the low tire pressure/TPMS indicator go off?
YES
Intermittent failure, the system is OK at this time.
NO
The failure is duplicated. Go to step 2.
- Tire pressure sensor check
- 1. Check the parameter(s) below with the HDS.
Signal Current conditions Values Unit Right Front Tire Air Pressure Left Front Tire Air Pressure Right Rear Tire Air Pressure Left Rear Tire Air Pressure Is the indicated tire pressure within 40 kPa (0.4 kgf/cm2 , 6 psi) of the actual tire pressure?
YES
Check for loose terminals and poor connections at the keyless access/TPMS control unit. If they are OK, Replace the keyless access/TPMS control unit .
NO
Check that the tire pressure sensor is properly mounted. If the mounting is OK, then replace the appropriate tire pressure sensor .