The tire pressure warning ECU receives a vehicle speed signal from the combination meter. This DTC is stored upon entering test mode, and cleared
when a vehicle speed signal of 20 km/h (12 mph) is detected for 3 seconds or more. This DTC is output only in test mode.
HINT
The meter CPU receives vehicle speed signals from this circuit. The vehicle speed sensor detects the voltage that varies according
to the vehicle speed. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed
signals based on the pulses of the voltage. The skid control ECU transmits vehicle speed signals as pulses to the meter CPU. A
voltage of 12 V is output from the combination meter assembly and then input to the skid control ECU. The signal is changed to a
pulse signal at the transistor in the combination meter assembly. A voltage of 12 V or 5 V is output from each ECU or relay and
then input to the combination meter assembly. Each ECU controls the respective system based on the pulse signal.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
- When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using Techstream and write
them down before removal.
- It is necessary to perform initialization See: Instrument Panel, Gauges and Warning Indicators/Tire Monitoring
System/Testing and Inspection/Programming and Relearning/Initialization after registration See: Instrument Panel, Gauges
and Warning Indicators/Tire Monitoring System/Testing and Inspection/Programming and Relearning/Registration of the
transmitter IDs into the tire pressure warning ECU if the ECU has been replaced.
PROCEDURE
1. READ VALUE USING TECHSTREAM (VEHICLE SPEED)
(a) Turn the engine switch off.
(b) Connect Techstream to the DLC3.
(c) Turn the engine switch on (IG) and turn the tester on.
(d) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(e) Check that the values indicated on the tester and on the combination meter are the same.
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