Tire Pressure Warning System Terminals Of Ecu

Suspension. Corolla. Zre142 Aze141
Tire Pressure Monitoring. Corolla. Zre142 Aze141

  1. CHECK TIRE PRESSURE WARNING ECU

Tire Pressure Warning System -- Terminals Of Ecu



CHECK TIRE PRESSURE WARNING ECU
HINT:
Inspect the connectors from the back side while the connectors are connected.

Corolla. Zre142 Aze141.Tire Pressure Monitoring.Tire Pressure Warning System.Tire Pressure Warning System Terminals Of Ecu

  1. Disconnect the L47 tire pressure warning antenna and receiver connector.

  2. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E94-12 (RDA) - E94-9 (GND)
    		R - W-B
    		Tire pressure warning antenna and receiver signal
    		Ignition switch ON
    		11 to 14 V

  3. Connect the L47 tire pressure warning antenna and receiver connector.

  4. Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may have a malfunction.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    E94-1 (CLSW) - E94-9 (GND)
    		SB - W-B
    		Tire pressure warning reset switch
    1. Ignition switch ON
    2. Tire pressure warning reset switch ON
    		8.5 to 15 V
    1. Ignition switch ON
    2. Tire pressure warning reset switch OFF
    		Below 1.5 V
    E94-2 (SPD) - E94-9 (GND)
    		V - W-B
    		Vehicle speed signal
    		Vehicle is running
    		Pulse generation (see waveform 1)
    E94-3 (TC) - E94-9 (GND)
    		G - W-B
    		TC terminal
    		Terminal TC is not connected
    		11 to 14 V
    E94-4 (TACH) - E94-9 (GND)
    		GR - W-B
    		Engine speed signal
    		Engine is running
    		Pulse generation (see waveform 2)
    E94-5 (IND) - E94-9 (GND)
    		P - W-B
    		Tire pressure warning light output signal
    1. Ignition switch ON
    2. Tire pressure warning light OFF
    		Below 0.5 V
    Tire pressure warning reset switch
    		After ignition switch is turned ON, tire pressure warning light illuminates for 3 seconds.
    		0.9 to 3.2 V
    E94-6 (RF5V) - E94-9 (GND)
    		B - W-B
    		Tire pressure warning antenna and receiver power source
    		Ignition switch ON
    		11 to 14 V
    E94-7 (IG) - E94-9 (GND)
    		L - W-B
    		IG power source
    		Ignition switch ON
    		11 to 14 V
    E94-9 (GND) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E94-10 (SIL) - E94-9 (GND)
    		W - W-B
    		Diagnostic communication
    		Ignition switch ON
    		8 to 14 V
    E94-11 (GND2) - E94-9 (GND)
    		LG - W-B
    		Tire pressure warning antenna and receiver ground
    		Always
    		Below 1 Ω
    E94-12 (RDA) - E94-9 (GND)
    		R - W-B
    		Tire pressure warning antenna and receiver signal
    		Ignition switch ON
    		11 to 14 V


    5. Corolla. Zre142 Aze141.Tire Pressure Monitoring.Tire Pressure Warning System.Tire Pressure Warning System Terminals Of Ecu

  5. Using an oscilloscope, check the waveform 1.

    Waveform 1:
    Item
    		Contents
    Terminal
    		E94-2 (SPD) - E94-9 (GND)
    Tool setting
    		5 V/DIV, 20 ms./DIV.
    Vehicle condition
    		Driving at approximately 20 km/h (12 mph)
    HINT:
    The wavelength becomes shorter as the vehicle speed increases.


    6. Corolla. Zre142 Aze141.Tire Pressure Monitoring.Tire Pressure Warning System.Tire Pressure Warning System Terminals Of Ecu

  6. Using an oscilloscope, check the waveform 2.

    Waveform 2:
    Item
    		Contents
    Terminal
    		E94-4 (TACH) - E94-9 (GND)
    Tool setting
    		5 V/DIV., 10 ms./DIV.
    Vehicle condition
    		Idling
    HINT:
    The wavelength becomes shorter as the engine speed increases.