Toyota RAV4 manuals

Toyota Sienna Service Manual: System description

1. DESCRIPTION OF SYSTEM

(a) A tire pressure warning valve and transmitter is equipped with a tire pressure sensor and a transmitter and is installed in a tire wheel assembly.

The sensor measures the tire pressure. The measured value and transmitter ID are transmitted to the tire pressure warning antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU from the tire pressure warning antenna and receiver. If the transmitter ID has already been registered, the ECU compares the measured air pressure value with the specified value. When the value is less than the specified value registered in the tire pressure warning ECU, the warning light on the combination meter comes on.

DESCRIPTION OF SYSTEM

2. INITIAL CHECK

INITIAL CHECK

(a) The tire pressure warning light turns on for 3 seconds after the ignition switch ON and then goes off.

HINT: If the warning light does not turn on for 3 seconds, troubleshoot the tire pressure warning light circuit.

3. WHEN TIRE PRESSURE WARNING LIGHT IS LIT

(a) When the tire pressure warning light does not go off, or when it comes on during driving, check 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) Under the following conditions, the system may not function properly.

(c) After removing and installing the ECU or a sensor, check for a diagnostic trouble code and verify that it is a normal code.

4. FUNCTION OF COMPONENTS

Components Function
Tire pressure warning valve and transmitter Combined as a single unit with a disc wheel air valve, it measures tire pressure and temperature and transmits an ID number for measurement value and identification.

Built-in the battery.

Tire pressure warning antenna and receiver Receives and transmits a necessary signal from the transmitter to the tire pressure warning ECU.
Tire pressure warning ECU Receives a signal from the receiver and identifies it as vehicle's own signal. If the measured value is equal to or lower than the specified value, it transmits a signal so that the tire pressure warning light on the combination meter comes on.
Tire pressure warning light Located in the combination meter, it informs the driver of lowered tire air pressure and system failure.
Tire pressure warning reset switch Enters the initialization mode for the change of the standard pressure

5. TIRE PRESSURE WARNING RESET SWITCH

Parts location
SYSTEM DIAGRAM HINT: The tire pressure warning valve and transmitter sends information on the temperature inside the tire, the ID, and the tire pressure. ...

How to proceed with troubleshooting
HINT: Use the following procedures to troubleshoot the tire pressure warning system. *: Use the intelligent tester. 1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER PROBLEM ANALYSIS (a) Intervi ...

Other materials:

Master cylinder pressure sensor check (when using sst check wire)
(a) Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more. (b) Check the ABS warning light stays on for 3 seconds. HINT: At this time, the ABS wa ...

Removal
1. REMOVE REAR SEAT 3 POINT TYPE BELT ASSEMBLY (for 8-Passenger) HINT: Refer to the instructions for disassembly of the rear No. 1 seat assembly (for center seat).  Remove the bolt and rear seat 3 point type belt assembly. 2. REMOVE REAR SEAT 3 POINT TYPE BELT ASSEMBLY (for 7-Pas ...

Removal
1. REMOVE BATTERY 2. REMOVE AIR CLEANER ASSEMBLY HINT: (See page EM-26) 3. REMOVE SPEED SENSOR (NT SENSOR) (a) Disconnect the speed sensor connector. (b) Remove the bolt and speed sensor. 4. REMOVE SPEED SENSOR (NC SENSOR) (a) Disconnect the speed sensor connector. (b) Remove th ...

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