DIAGNOSIS SYSTEM
1. CHECK WARNING LIGHT
NOTICE:
(a) Turn the ignition switch to ON.
(b) Check that the tire pressure warning light illuminates for 3 seconds.
2. HOW TO PROCEED WHEN TIRE PRESSURE WARNING LIGHT COMES ON
(a) When the tire pressure warning light does not go off, or when it comes on during driving, check the tire pressure. If the tire pressure warning light comes on within several hours after adjusting the tire pressure, the tire may have a slow air leak.
(b) The system does not operate under the following conditions (when the problem is corrected, operation returns to normal).
(1) Tires without a tire pressure warning valve and transmitter are used.
(2) A tire pressure warning valve and transmitter ID is not registered in the ECU.
(3) The tire pressure is abnormally high (absolute pressure: 600 kPa (6.1 kgf/cm2, 87 psi) or higher; relative pressure: 500 kPa (5.1 kgf/cm2, 73 psi) or higher).
(4) The battery voltage of the tire pressure warning valve and transmitter has dropped (battery life: 10 years).
(c) The system may not operate under the following conditions (when the problem is corrected, operation returns to normal).
(1) Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
(2) A radio device of similar frequencies is used in the vehicle.
(3) A type of film that affects radio waves is attached to the windows.
(4) A large amount of snow or ice is stuck to the vehicle, especially onto the wheels and around the wheel houses.
(5) Any wheels other than the specified ones are used.
(6) Tire chains are used.
(7) A large metallic object which can interfere with signal reception is put in the luggage room.
3. TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART
HINT:
The table below indicates the state of the tire pressure warning light after the ignition switch is turned to ON.
Condition |
Immediately after turning ignition switch to ON |
Always |
|||||
---|---|---|---|---|---|---|---|
Warning light output pattern |
|||||||
Comes on for 3 seconds |
Goes off |
Comes on |
Blinks for 1 minute and then illuminates*1 |
Blinks*2 |
Blinks*3 |
DTC output |
|
Normal |
○ |
○ |
- |
- |
- |
- |
- |
Low tire pressure |
○ |
- |
○ |
- |
- |
- |
- |
System failure |
○ |
- |
- |
○ |
- |
- |
- |
Test mode (signal check mode) |
○ |
- |
- |
- |
○ |
- |
- |
ECU connector poorly connected |
- |
- |
- |
○*4 |
- |
- |
- |
TC ground (DTC is output) |
○ |
- |
- |
- |
- |
- |
○ |
TC ground (DTC is not output) |
○ |
- |
- |
- |
- |
○ |
- |
4. NORMAL MODE DTC
(a) DTCs are stored in the tire pressure warning ECU and are output by the blinking of the tire pressure warning light or by using the Techstream (See page ).
5. TEST MODE (SIGNAL CHECK MODE) DTC
(a) By switching from normal mode into test mode (signal check mode) (input signal check), it is possible to inspect the tire pressure warning antenna and receiver, each tire pressure warning valve and transmitter and each vehicle speed sensor (See page ).
6. FAIL-SAFE FUNCTION
(a) When a system malfunction occurs in the tire pressure warning system, the tire pressure warning light comes on after blinking for 1 minute and informs the driver of the system failure.
(b) Diagnostic trouble codes are stored in the tire pressure warning ECU when malfunctions occur.
Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
Wait at least 90 seconds after d ...
Transfer L4 Position Switch Circuit (C1268)
DESCRIPTION
DTC Code
DTC Detection Condition
Trouble Area
C1268
The skid control ECU receives an L4 abnormal status signal from the four
wheel drive control ECU via CAN.
Tr ...