Tire Pressure Warning System (For Hatchback) Tire Pressure Warning Light Circuit

Suspension. Yaris. Ncp93, 131
Tire Pressure Monitoring. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

PERFORM ACTIVE TEST USING TECHSTREAM (INDICAT. TIRE PRESSURE WARNING SYSTEM)

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER (RDA TERMINAL)

CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

TIRE PRESSURE WARNING SYSTEM (for Hatchback) - Tire Pressure Warning Light Circuit


DESCRIPTION

If the tire pressure warning ECU detects any problems, the tire pressure warning light blinks (stays on after blinking for 1 minute) and tire pressure monitoring is cancelled at the same time. At this time, the ECU stores a DTC in memory.
Connecting terminals TC and CG of the DLC3 makes the tire pressure warning light blink to output DTCs.
The tire pressure warning ECU and receiver sends the tire pressure warning light illumination request signal to the main body ECU (multiplex network body ECU) via a direct line. The main body ECU (multiplex network body ECU) then sends the signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM


Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan).Tire Pressure Warning System (For Hatchback) Tire Pressure Warning Light Circuit


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.
  2. It is necessary to perform initialization (YARIS_NCP93 RM000000XMZ073X.html) after registration (YARIS_NCP93 RM000000XN107WX.html) of the transmitter IDs into the tire pressure warning ECU if the ECU has been replaced.
  3. When replacing the tire pressure warning ECU and receiver on vehicles equipped with the wireless door lock control system, be sure to perform Registration of Recognition Code to register the transmitter IDs after ECU replacement (YARIS_NCP93 RM0000023D302UX.html).
1.CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

  1. Check if a CAN communication system DTC is output.

    Yaw Rate Sensor Type
    		See Page
    for Hatchback except Separate Type Yaw Rate Sensor
    		YARIS_NCP93 RM000001RSW02LX.html
    for Hatchback with Separate Type Yaw Rate Sensor
    		YARIS_NCP93 RM000001RSW02PX.html
    Result
    Result
    		Proceed to
    DTCs is not output
    		A
    DTCs is output (for Hatchback except Separate Type Yaw Rate Sensor)
    		B
    DTCs is output (for Hatchback with Separate Type Yaw Rate Sensor)
    		C


B
GO TO CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001RSO05UX.html)

C
GO TO CAN COMMUNICATION SYSTEM (YARIS_NCP93 RM000001RSO066X.html)
A


2.PERFORM ACTIVE TEST USING TECHSTREAM (INDICAT. TIRE PRESSURE WARNING SYSTEM)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Body Electrical / Combination Meter / Active Test.

  1. Check the condition of the tire pressure warning light by using the Techstream.

    Combination Meter
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Indicat. Tire Pressure Warning System
    		Tire pressure warning light
    		Tire pressure warning light OFF or ON
    		Confirm that the vehicle is stopped, engine idling
    OK:
    The tire pressure warning light turns on or off in accordance with the Techstream operation.


NG
GO TO METER / GAUGE SYSTEM (YARIS_NCP93 RM000001F8D01DX.html)
OK


3.CHECK TIRE PRESSURE WARNING ECU AND RECEIVER (RDA TERMINAL)

  1. Disconnect the main body ECU (multiplex network body ECU) D143 connector.



    Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan).Tire Pressure Warning System (For Hatchback) Tire Pressure Warning Light Circuit

  1. Using an oscilloscope, check waveform.

    Text in Illustration
    *a
    		Component with harness connected
    (Tire Pressure Warning ECU and Receiver)
    *b
    		Example
    *c
    		GND
    Waveform:
    Item
    		Contents
    Terminal
    		J69-4 (RDA) - J69-12 (GND)
    Tool setting
    		5 V/DIV, 500 μs./DIV.
    Vehicle condition
    		Ignition switch ON
    OK:
    Waveform alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage.
    HINT:
    The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.


NG
REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER (YARIS_NCP93 RM000004VV4001X.html)
OK


4.CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

  1. Disconnect the tire pressure warning ECU and receiver J69 connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J69-4 (RDA) - D143-26 (RDA)
    		Always
    		Below 1 Ω
    D143-26 (RDA) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (YARIS_NCP93 RM000003TOE00CX.html)