Tire Pressure Warning System How To Proceed With Troubleshooting

Interview the customer to confirm the problem.

HINT:

It is important to collect as much specific information as possible from the customer to allow for a quick repair.

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

Set the tire pressure to the specified value (Click here).

HINT:

Refer to the link, as the procedure for adjusting the tire pressures differs depending on the temperature of the tires.

Display "ID Tire Inflation Pressure" in the Data List and check that the tire pressure values match the adjusted pressure amount.

HINT:

It may take a few minutes until the values are displayed.

Perform initialization (Click here).

HINT:

for FMVSS138 Type:

1. The tire pressure warning system illuminates the tire pressure warning light to warn the driver when the following condition is met:
   
1. Due to the operation of the tire pressure warning reset switch, the tire pressure drops to approximately 75% or less of the tire pressure set during system initialization.
   

for ECE-R64 Type:

1. The warning threshold value changes depending on the driving conditions during initialization. As a result, the tire pressure warning light may not turn off even if the tire pressure is adjusted to the specified pressure.
   
2. The tire pressure warning system illuminates the tire pressure warning light to warn the driver when any of the following conditions are met:
   
1. Due to the operation of the steering pad switch assembly, the tire pressure drops to approximately 80% or less of the tire pressure set during system initialization.
   
2. The tire pressure drastically decreases (approximately 20 kPa (0.2 kgf/cm², 2.9 psi) or more within several minutes) to approximately 80% or less of the tire pressure* when the tires are warmed.
   *: If initialization is performed and the vehicle is driven for a certain period of time, the tire pressure set during system initialization is adjusted and set to the tire pressure when the tires are warmed from the driving conditions.
   

   NOTICE:

   If the tire pressure is decreased approximately 20 kPa (0.2 kgf/cm², 2.9 psi) or more in order to adjust the tire pressure, even if the adjusted tire pressure is 80% or more than the tire pressure set during system initialization, the tire pressure warning light may illuminate if the tire pressure drops below 80% of the tire pressure set when the tires are warmed. In this case, perform initialization again.

Check the ECUs connected to the CAN bus (for LHD with Central Gateway ECU: Click here, for LHD without Central Gateway ECU: Click here, for RHD with Central Gateway ECU: Click here, for RHD with Central Gateway ECU: Click here).

Result:

Result		Proceed to
No malfunction appears		A
Malfunction appears	for LHD with Central Gateway ECU	B
	for LHD without Central Gateway ECU	C
	for RHD with Central Gateway ECU	D
	for RHD without Central Gateway ECU	E

Check for DTCs (for LHD with Central Gateway ECU: Click here, for LHD without Central Gateway ECU: Click here, for RHD with Central Gateway ECU: Click here, for RHD with Central Gateway ECU: Click here).

Result:

Result		Proceed to
CAN system DTCs are not output		A
CAN system DTCs are output	for LHD with Central Gateway ECU	B
	for LHD without Central Gateway ECU	C
	for RHD with Central Gateway ECU	D
	for RHD without Central Gateway ECU	E

Check for DTCs (Click here).

Result:

Result	Proceed to
DTCs are output	A
DTCs are not output	B

Refer to Diagnostic Trouble Code Chart (Click here).

Refer to Problem Symptoms Table (Click here).

Refer to Electronic Circuit Inspection Procedure (Click here).

Repair or replace parts based on the diagnosis result.

Check the Data List to confirm that the tire inflation pressure has been received (Click here).

Perform initialization (Click here).

Confirm that the initialization has been completed.