Last Modified: 11-29-2007 1.6 D
Service Category: Suspension Section: Tire Pressure Monitoring
Model Year: 2008 Model: Sequoia Doc ID: RM000000XMW02MX
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: DIAGNOSIS SYSTEM (2008 Sequoia)

DIAGNOSIS SYSTEM

1. CHECK BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge the battery before proceeding.

2. DIAGNOSIS SYSTEM

(a) Warning light

(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.

(b) 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 the Techstream TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(c) 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 TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: TEST MODE PROCEDURE (2008 Sequoia) .

3. CHECK TIRE PRESSURE WARNING LIGHT

(a) Turn the ignition switch to ON.

(b) Check that the tire pressure warning light turns 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

TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: DESCRIPTION (2008 Sequoia)

4. TIRE PRESSURE WARNING LIGHT 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 ON

Always

Warning Light Output Pattern

Turns on for 3 Seconds

Goes Off

Turns On

Blinks for 1 Minute and then Illuminates*1

Blinks*2

Blinks*3

Blinks*4

Output DTC

Normal

○

○

-

-

-

-

-

-

Low tire pressure

○

-

○

-

-

-

-

-

System failure

○

-

-

○

-

-

-

-

Test mode

○

-

-

-

○

-

-

-

Initialization

○

-

-

-

-

○

-

-

ECU connector poorly connected

-

-

-

○*5

-

-

-

-

TC ground (DTC is output)

○

-

-

-

-

-

-

○

TC ground (DTC is not output)

○

-

-

-

-

-

○

-

*1: Turns on and goes off repeatedly at 0.5-second intervals, and turns on after 1 minute.

*2: Turns 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 there is a open circuit, the light is off for 10 seconds. Then it blinks at 0.5-second intervals, and turns on after 1 minute.