CHARGING SYSTEM TERMINALS OF ECU


  1. CHECK ECM

    A004HB3E04

    1. Measure the resistance, voltage and waveform according to the value(s) in the table below.

      Terminal No.

      (Symbol)

      		 Wiring Color Terminal Description Condition Specified Condition
      A33-2 (BATT) - A34-1 (E03) W - B-R Battery power Always 11 to 14 V
      A33-11 (IB) - A35-30 (EPA2) R-B - Y-B Battery current sensor Ignition switch ON 0.5 to 4.5 V
      A33-24 (THB) - A35-30 (EPA2) R-W - Y-B Battery temperature sensor Ignition switch ON 20 to 50°C (68 to 122°F) 1.1 to 2.4 V
      A34-1 (E03) - Body ground B-R - Body ground Body ground Always Below 1 Ω
      A35-18 (ALT) - A34-1 (E03) V - B-R Generator Idling with warm engine Pulse generation (See waveform 1)
      A35-22 (VCP2) - A35-30 (EPA2) G-B - Y-B Power source of battery current sensor assembly Ignition switch ON 4.5 to 5.5 V

      If the result is not as specified, the ECU may have a malfunction.

    2. A004JX1E02

      WAVEFORM 1

      Generator
      Tester Connection Tool Setting Vehicle Condition Specified Condition
      A35-18 (ALT) - A34-1 (E03) 2 V/DIV., 2 msec./DIV. Idling with warm engine Correct waveform as shown in illustration

      Tech Tips


      • The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      • A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.