Toyota 4Runner manuals

Toyota 4Runner: 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

(c) Connect the F7 ECU connector.

(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

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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