PRE-COLLISION SYSTEM TERMINALS OF ECU


  1. CHECK PRE-COLLISION CITY SENSOR

    A002MUTE02

    1. Disconnect the Q12 pre-collision city sensor connector.

      Note


      • DTCs may be output when connectors are disconnected during inspection. Therefore, be sure to clear the DTCs using the GTS once the inspection has been completed.

      • Do not apply excessive force to the Q12 pre-collision city sensor connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q12-8 (BUZ) - Q12-10 (GND) GR - W-B Pre-collision city buzzer operation signal Ignition switch ON, pre-collision city buzzer not operating 11 to 14 V
      Ignition switch ON, pre-collision city buzzer operating 0 to 1.5 V
      Q12-9 (PCSW) - Q12-10 (GND) B - W-B Pre-collision system cancel switch signal Pre-collision system cancel switch being pressed Below 1 Ω
      Pre-collision system cancel switch not being pressed 100 kΩ or higher
      Q12-7 (IG1) - Q12-10 (GND) L - W-B Power source Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      Q12-10 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      Tech Tips

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the Q12 pre-collision city sensor connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      Q12-5 (CA1P) - Q12-10 (GND) R - W-B CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 1)
      Q12-11 (CA1N) - Q12-10 (GND) W - W-B CAN communication signal Ignition switch ON

      Pulse generation

      (See waveform 1)
    5. A002QR4E06

      Waveform 1


      1. CAN communication signal

        Item Content
        Tester Connection

        • CH1: Q12-5 (CA1P) - Q12-10 (GND)

        • CH2: Q12-11 (CA1N) - Q12-10 (GND)
        Tool Setting 1 V/DIV., 50 μsec./DIV.
        Condition Ignition switch ON

        Tech Tips

        If the result is not as specified, the CAN bus line, terminating resistor circuit (or part with this circuit) or pre-collision city sensor is malfunctioning.