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ECM Terminal Arrangement

  1. Engine control computer
    Fig 1: ECM (Engine Control Computer) Connector Terminal Identification
    G10215865Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. (Terminal symbol) Input Output Measuring condition Standard value
    A35-22 (VCP2) ↔ A35-30 (EPA2) Output IG ON 4.5 - 5.5 V
    A33-11 (IB) ↔ A35-30 (EPA2) Input IG ON 0.5 - 4.5 V
    A33-24 (THB) ↔ A35-30 (EPA2) Input IG ON (Battery temperature sensor surrounding temperature of 20 to 50°C {68 to 122°F}) 1.1 - 2.4 V
    A34-1 (E03) ↔ Chassis ground Ground Always (Resistance check) Less than 1 Ω
    A33-2 (BATT) ↔ A34-1 (E03) Input Always 11 to 14 V
    A35-18 (ALT) ↔ A34-1 (E03) Input Idling Pulse generation (waveform 1)
  2. Charging control oscilloscope waveform.
    1. Waveform 1
      Item Contents
      Measuring terminal A35-18 (ALT) - A34-1 (E03)
      Equipment setting 2 V/DIV, 2 ms/DIV
      Condition Idling
      NOTE:
      • This oscilloscope waveform is shown as an example for reference and has had noise and chattering removed.
      • As the duty ratio can vary depending on the electrical load and battery conditions, a constant value is not output.
      Fig 2: Charging Control Oscilloscope Waveform 1
      G10215866Courtesy of SUBARU OF AMERICA, INC.
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