Toyota Avalon Service & Repair 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 O5 forward recognition camera connector.

CHECK FORWARD RECOGNITION CAMERA

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

O5-7 (IGB) - O5-10 (GND)

LA-P - LA

Power source

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

O5-10 (GND) - Body ground

LA - Body ground

Ground

Always

Below 1 Ω

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

O5-1 (HTR) - O5-10 (GND)

B - LA

Forward recognition with heater hood sub-assembly operation signal

Engine switch on (IG)

Forward recognition with heater hood sub-assembly not operating

11 to 14 V

Engine switch on (IG)

Forward recognition with heater hood sub-assembly operating

Below 1 V

(c) 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

O5-5 (CA1P) - O5-10 (GND)

L - LA

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 1)

O5-11 (CA1N) - O5-10 (GND)

W - LA

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 2)

O5-6 (CANH) - O5-10 (GND)

G - LA

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 1)

O5-12 (CANL) - O5-10 (GND)

W - LA

CAN communication signal

Engine switch on (IG)

Pulse generation

(See waveform 2)

(1) WAVEFORM 1

Item

Content

Terminal Name

Between O5-5 (CA1P) and O5-10 (GND)

Between O5-6 (CANH) and O5-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

(2) WAVEFORM 2

Item

Content

Terminal Name

Between O5-11 (CA1N) and O5-10 (GND)

Between O5-12 (CANL) and O5-10 (GND)

Tester Range

1 V/DIV., 10 μsec./DIV.

Condition

Engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

    System Diagram

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

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