Diagnosis System

CHECK DLC3
1. Check the DLC3 (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).
DIAGNOSIS SYSTEM
1. Warning light and indicator
  1. When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5-second intervals, and turns on after 1 minute
  HINT:
  
  When the malfunction has been corrected, the tire pressure warning light does not turn on.
  
  Fig 1: Identifying Tire Pressure Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. DTCs (Normal mode)
  1. DTCs are memorized in the tire pressure warning ECU and read by the blinks of the tire pressure warning light or by using Techstream (See DTC CHECK/CLEAR ).
3. Test mode
  1. By switching from normal mode into test mode (input signal check), you can inspect the tire pressure warning antenna and receiver, each tire pressure warning valve and transmitter, and vehicle speed sensor (See TEST MODE PROCEDURE ).
CHECK TIRE PRESSURE WARNING LIGHT
1. Turn the ignition switch on (IG).
2. 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 (See TIRE PRESSURE WARNING LIGHT CIRCUIT ).

TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART

Fig 2: Identifying Tire Pressure Warning Light

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The table below indicates the state of the tire pressure warning light and indicator after the ignition switch on (IG).

WARNING LIGHT OUTPUT PATTERN

Immediately after turning the ignition switch on (IG)

Always

Warning light output pattern

Comes on for 3 sec.

Goes off

Comes on

Blinks for 1 minute and then illuminates (⁽¹⁾)

Blinks (⁽²⁾)

Blinks (⁽³⁾)

Blinks (⁽⁴⁾)

Outputs DTC

Normal

◦

Low tire pressure

◦

System fail

◦

Test mode

◦

Initialization

◦

ECU connector poorly connected

◦ (⁽⁵⁾)

TC ground (DTC is output)

◦

TC ground (DTC is not output)

◦

⁽¹⁾	Comes on and goes off repeatedly at 0.5-second intervals, and remains on after 1 minute.

⁽²⁾	Comes on and goes off repeatedly at 0.125-second intervals.

⁽³⁾	Blinks 3 times (1 second on, 1 second off).

⁽⁴⁾	Turns on and goes off repeatedly at 0.25-second intervals.

⁽⁵⁾	When determining if there is a short circuit (10 seconds), the light is off. Then it blinks at 0.5 second intervals, and remains on after 1 minute.

Fig 3: Tire Pressure Warning Light Blinking Pattern (1 Of 5)

Fig 4: Tire Pressure Warning Light Blinking Pattern (2 Of 5)

Fig 5: Tire Pressure Warning Light Blinking Pattern (3 Of 5)

Fig 6: Tire Pressure Warning Light Blinking Pattern (4 Of 5)

Fig 7: Tire Pressure Warning Light Blinking Pattern (5 Of 5)