Toyota Tundra Service Manual: Terminals Of Ecu

TERMINALS OF ECU

NOTICE:

  • DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the Techstream once the inspection has been completed.
  • Do not apply excessive force to the W9 forward recognition camera connector.

CHECK FORWARD RECOGNITION CAMERA

(a) Disconnect the forward recognition camera connector.

*a

Front view of wire harness connector

(to Forward Recognition Camera)

-

-

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

W9-7 (IGB) - W9-10 (GND)

R - W-B

Power source

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

W9-10 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the forward recognition camera connector.

*a

Component with harness connected

(Forward Recognition Camera)

-

-

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

W9-1 (HTR) - W9-10 (GND)

V - W-B

Camera heater (forward recognition hood) operation signal

Ignition switch ON, camera heater (forward recognition hood) not operating

11 to 14 V

Ignition switch ON, camera heater (forward recognition hood) operating

0 to 1.5 V

W9-8 (BZ) - W9-10 (GND)

SB - W-B

Skid control buzzer assembly

Ignition switch ON, skid control buzzer assembly not operating

11 to 14 V

Ignition switch ON, skid control buzzer assembly operating

0 to 1.5 V

(e) Check for pulses according to the value(s) in the table below.

HINT:

If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the forward recognition camera is suspected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

W9-5 (CA1P) - W9-10 (GND)

BE - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

W9-11 (CA1N) - W9-10 (GND)

W - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

W9-6 (CANH) - W9-10 (GND)

G - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

W9-12 (CANL) - W9-10 (GND)

W - W-B

CAN communication signal

Ignition switch ON

Pulse generation

(See waveform 2)

(1) Waveform 1

Item

Content

Terminal Name

Between W9-5 (CA1P) and W9-10 (GND)

Between W9-6 (CANH) and W9-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(2) Waveform 2

Item

Content

Terminal Name

Between W9-11 (CA1N) and W9-10 (GND)

Between W9-12 (CANL) and W9-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

    System Diagram

    Lost Communication with ECM / PCM "A" (U0100,U0101,U0123,U0126,U0129,U0142,U0155)

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