Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Suspension / Tire Pressure Monitoring / Tire Pressure Warning System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK TIRE PRESSURE WARNING ECU

HINT:

Inspect the connector from the back side.

(a) Disconnect the F7 ECU connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F7-7 (IG) - F7-9 (GND)	G - W-B	IG power source	Ignition switch ON	11 to 14 V

(d) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F7-2 (SPD) - F7-9 (GND)	SB - W-B	Vehicle speed signal	Vehicle being driven	Pulse generation (see waveform 1)
F7-3 (TC) - F7-9 (GND)	R - W-B	TC terminal	Terminal TC not connected	11 to 14 V
F7-4 (TACH) - F7-9 (GND)	P - W-B	Engine speed signal	Engine running	Pulse generation (see waveform 2)
F7-5 (IND) - F7-9 (GND)	G - W-B	Tire pressure warning light output signal	After ignition switch turned to ON, tire pressure warning light illuminates for 3 seconds	0.9 to 3.2 V
F7-5 (IND) - F7-9 (GND)	G - W-B	Tire pressure warning light output signal	Ignition switch ON Tire pressure warning light off	3.2 V or higher
F7-6 (RF5V) - F7-9 (GND)	LG - W-B	Tire pressure warning antenna and receiver power source	Ignition switch ON	4.5 to 5.5 V
F7-9 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F7-10 (SIL) - F7-9 (GND)	G - W-B	Diagnosis tester communication line	Ignition switch ON Communication not performed with tester	11 to 14 V
F7-11 (GND2) - F7-9 (GND)	GR - W-B	Tire pressure warning antenna and receiver ground	Always	Below 1 Ω
F7-12 (RDA) - F7-9 (GND)	SB - W-B	Tire pressure warning antenna and receiver signal	Ignition switch ON	11 to 14 V

(e) Using an oscilloscope, check waveform 1.

Item	Contents
Terminal No. (Symbol)	F7-2 (SPD) - F7-9 (GND)
Tool Setting	5 V/DIV., 200 ms/DIV.
Vehicle Condition	Vehicle being driven at approximately 20 km/h (12 mph)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

(f) Using an oscilloscope, check waveform 2.

Item	Contents
Terminal No. (Symbol)	F7-4 (TACH) - F7-9 (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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