Toyota Venza: Terminals Of Ecu

Toyota Venza Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK TIRE PRESSURE WARNING ECU

HINT:

Inspect the connectors from the back side while the connectors are connected.

(a) Disconnect the L14 tire pressure warning antenna and receiver connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
D31-12 (RDA) - D31-9 (GND)	Y - W-B	Tire pressure warning antenna and receiver signal	Ignition switch ON	11 to 14 V

(d) 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
D31-2 (SPD) - D31-9 (GND)	P - W-B	Vehicle speed signal	Vehicle driving	Pulse generation (see waveform 1)
D31-3 (TC) - D31-9 (GND)	BR - W-B	TC terminal	Terminal TC not connected	11 to 14 V
D31-4 (TACH) - D31-9 (GND)	V - W-B	Engine speed signal	Engine running	Pulse generation (see waveform 2)
D31-5 (IND) - D31-9 (GND)	LG - W-B	Tire pressure warning light output signal	Ignition switch ON Tire pressure warning light OFF	Below 0.5 V
D31-5 (IND) - D31-9 (GND)	LG - W-B	Tire pressure warning light output signal	After ignition switch is turned to ON, tire pressure warning light illuminates for 3 seconds.	0.9 to 3.2 V
D31-6 (RF5V) - D31-9 (GND)	R - W-B	Tire pressure warning antenna and receiver power source	Ignition switch ON	11 to 14 V
D31-7 (IG) - D31-9 (GND)	GR - W-B	IG power source	Ignition switch ON	11 to 14 V
D31-9 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
D31-10 (SIL) - D31-9 (GND)	P - W-B	Diagnostic communication	Ignition switch ON	8 to 14 V
D31-11 (GND2) - D31-9 (GND)	W - W-B	Tire pressure warning antenna and receiver ground	Always	Below 1 Ω
D31-12 (RDA) - D31-9 (GND)	Y - W-B	Tire pressure warning antenna and receiver signal	Ignition switch ON	11 to 14 V

(e) Using an oscilloscope, check waveform 1.

Waveform 1

Item	Content
Terminal	D31-2 (SPD) - D31-9 (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.

(f) Using an oscilloscope, check waveform 2.

Waveform 2

Item	Content
Terminal	D31-4 (TACH) - D31-9 (GND)
Tool setting	5 V/DIV., 10 ms./DIV.
Vehicle condition	Idling

HINT:

The wavelength becomes shorter as the engine speed increases.

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