Toyota Venza manuals

Toyota Venza: 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

(c) Connect the L14 tire pressure warning antenna and receiver connector.

(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

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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