CHARGING SYSTEM TERMINALS OF ECM

  1. A194498E38

    TERMINAL INSPECTION

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

      Tip:

      The standard voltage of each ECM terminal is shown in the table below.

      In the table, first follow the information in "Condition". Look at "Terminal No. (Symbol)" for the terminals to be inspected. The standard voltage between the terminals is shown in "Specified Condition".

      Use the illustration above as a reference for the ECM terminals.

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      B76-55 (RLO) - B76-109 (E1)

      R - BR

      Generator

      After engine warmed up, during charging control, vehicle accelerated

      Pulse generation

      (see waveform 1)

      B76-55 (RLO) - B76-109 (E1)

      R - BR

      Generator

      After engine warmed up, during charging control, vehicle decelerated

      Pulse generation

      (see waveform 2)

      B76-75 (VCIB) - B76-77 (EIB)

      GR - L

      Battery current sensor assembly

      Ignition switch ON

      4.5 to 5.5 V

      B76-115 (THB) - B76-77 (EIB)

      W - L

      Battery current sensor assembly

      Ignition switch ON

      0.2 to 4.8 V

      B76-116 (IB) - B76-77 (EIB)

      R - L

      Wiper operation signal

      Ignition switch ON,

      battery thermometer sensor surrounding temperature -30 to 90°C (-22 to 194°F)

      0.2 to 4.8 V

      B76-109 (E1) - Body ground

      BR - Body ground

      Ground circuit of ECM

      Always

      Below 1 Ω

      A61-2 (BATT) - B76-109 (E1)

      W - BR

      Battery (for measuring the battery voltage and for the ECM memory)

      Always

      11 to 14 V
    2. A287459E01

      Using an oscilloscope, check waveform 1.

      Waveform 1

      Item

      Content

      Terminal No. (Symbol)

      B76-55 (RLO) - B76-109 (E1)

      Tool Setting

      2 V/DIV., 50 ms./DIV.

      Condition

      After engine warmed up, during charging control, vehicle accelerated
      Tip:

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

    3. A287460E01

      Using an oscilloscope, check waveform 2.

      Waveform 2

      Item

      Content

      Terminal No. (Symbol)

      B76-55 (RLO) - B76-109 (E1)

      Tool Setting

      2 V/DIV., 50 ms./DIV.

      Condition

      After engine warmed up, during charging control, vehicle decelerated
      Tip:

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