Tire Pressure Warning System (For Sedan) Terminals Of Ecu

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

  1. CHECK TIRE PRESSURE WARNING ECU

Tire Pressure Warning System (For Sedan) -- Terminals Of Ecu


HINT:
Inspect the connectors from the back side.

CHECK TIRE PRESSURE WARNING ECU

Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan).Tire Pressure Warning System (For Sedan) Terminals Of Ecu


Terminal No. (Symbol)
Wiring Color
Terminal Description
Condition
Specified Condition
D78-2 (SPD) - D78-9 (GND)
V - W-B
Vehicle speed signal
Vehicle is running
Pulse generation
(see waveform 1)
D78-3 (TC) - D78-9 (GND)
G - W-B
TC terminal
When terminal TC is not connected
11 to 14 V
D78-4 (TACH) - D78-9 (GND)
R - W-B
Engine speed signal
Engine is running
Pulse generation (see waveform 2)
D78-5 (IND) - D78-9 (GND)
BE - W-B
Tire pressure warning light output signal
After ignition switch is turned ON, when tire pressure warning light illuminates for 3 seconds
1.6 to 2.4 V
Ignition switch ON
Tire pressure warning light off
4.0 V or higher
D78-6 (RF5V) - D78-9 (GND)
W - W-B
Tire pressure warning antenna and receiver power source
Ignition switch ON
4.5 to 5.5 V
D78-7 (IG) - D78-9 (GND)
R - W-B
IG power source
Ignition switch ON
11 to 14 V
D78-9 (GND) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
D78-10 (SIL) - D78-9 (GND)
W - W-B
Diagnosis tester communication line
Ignition switch ON, when communication is not performed with a tester
11 to 14 V
D78-11 (GND2) - D78-9 (GND)
GR - W-B
Tire pressure warning antenna and receiver ground
Always
Below 1 Ω
D78-12 (RDA) - D78-9 (GND)
B - W-B
Tire pressure warning antenna and receiver signal
Ignition switch ON
Below 2 V


    Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan).Tire Pressure Warning System (For Sedan) Terminals Of Ecu

  1. Using an oscilloscope, check the waveform 1.

    Item
    		Contents
    Terminal No. (Symbols)
    		D78-2 (SPD) - D78-9 (GND)
    Tool Setting
    		5 V/DIV., 200 ms/DIV.
    Vehicle Condition
    		While driving at approximately 20 km/h (12 mph).
    HINT:
    The wavelength becomes shorter as the vehicle speed increases.


    2. Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan).Tire Pressure Warning System (For Sedan) Terminals Of Ecu

  2. Using an oscilloscope, check the waveform 2.

    Item
    		Contents
    Terminal No. (Symbols)
    		D78-4 (TACH) - D78-9 (GND)
    Tool Setting
    		5 V/DIV., 10 ms/DIV.
    Vehicle Condition
    		Idling
    HINT:
    The wavelength becomes shorter as the engine speed increases.