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 |
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.
Test yourself
A quick Toyota 4Runner quiz: every answer comes with an explanation and a link to the manual page.