Tire Pressure Warning System Diagnosis System
CHECK BATTERY VOLTAGE
CHECK DLC3
DIAGNOSIS SYSTEM
CHECK WARNING LIGHT
TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART
Tire Pressure Warning System -- Diagnosis System |
If the voltage is below 11 V, recharge the battery before proceeding.
- Battery voltage:
- 11 to 14 V
The vehicle's tire pressure monitor ECU uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
Verify the conditions listed in the table below:
Terminal No.
| Disc.
| Connection / Voltage or Resistance
| Condition
|
7
| SIL
| Bus + Line / Pulse generation
| During transmission
|
4
| CG
| Chassis Ground to Body Ground / 1 Ω or less
| Always
|
16
| BAT
| Battery Positive to Body Ground / 10 to 14 V
| Always
|
- HINT:
- If the intelligent tester display shows a communication error message when the cable of the intelligent tester is connected to DLC3, the engine switch is turned on (IG) and the tester is in operation, there is a problem on the vehicle side or tester side.
- If communication is normal when the tester is connected to another vehicle, inspect DLC3 on the original vehicle.
- If communication is still not possible when the tool is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester operator's manual.
Warning light and indicator
When there is a problem with the tire pressure warning system, the "CHECK SYSTEM" displayed on the multi-display and the tire pressure warning light blinks at 0.5 second intervals.
- NOTICE:
- When the malfunction has been corrected, the tire pressure warning light does not come on and the "CHECK SYSTEM" does not display.
DTCs (Normal mode)
DTCs are memorized in the tire pressure monitor ECU and read by the blinks of the tire pressure warning light or using the intelligent tester (Click here).
Test mode
By switching from normal mode into test mode (input signal check), you can inspect the tire pressure monitor receiver assembly, each tire pressure monitor valve sub-assembly and vehicle speed sensor (Click here).
Turn the engine switch on (IG).
Check that the tire pressure warning light comes on for 3 seconds.
If the warning check result is not normal, proceed to the troubleshooting for the tire pressure warning light circuit.
Trouble Area
| See procedure
|
Tire pressure warning light circuit
| Click here
|
| TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART |
- HINT:
- The table below indicates the state of the tire pressure warning light and indicator after the engine switch is turned on (IG).
| Immediately after turning the engine switch on (IG)
| Always
|
Warning light output pattern
| Warning indicator output pattern
|
Comes on for 3 sec.
| Goes off
| Comes on
| Blink (*1)
| Blinks (*2)
| Blinks (*3)
| Displayed on multi-information display
|
Normal
| ○
| ○
|
|
|
|
| -
|
Low tire pressure
| ○
|
| ○
|
|
|
| LOW TIRE
|
System fail
| ○
|
|
| ○
|
|
| CHECK SYSTEM
|
Test mode
| ○
|
|
|
| ○
|
| TEST MODE
|
Initialization
| ○
|
|
|
|
| ○
| PRESSURE INITIAL (*4)
|
ECU connector poorly connected
|
|
| ○
|
|
|
| -
|
TC ground
| ○
|
|
|
|
|
| DIAG TIRE OK (*5)
|
- *1: Comes on and goes off repeatedly at 0.5 second intervals.
- *2: Comes on and goes off repeatedly at 0.125 second intervals.
- *3: Blinks 3 times (1 second on, 1 second off).
- *4: This message is displayed only when the engine is on.
- *5: When there is no DTC, "OK" is displayed; when there is DTC, the DTC is displayed.
