CHARGING SYSTEM TERMINALS OF ECM


  1. CHARGING SYSTEM

    A01CEQ4E10

    Tech Tips

    The standard voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated.

    The result of checks should be compared with the standard voltage for that pair of terminals, displayed in the Specified Condition column.

    The illustration above can be used as a reference to identify the ECM terminal locations.

    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    A8-20 (BATT) - D41-104 (E1) V - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
    D41-104 (E1) - Body ground BR - - Earth (ground) circuit of ECM Always Below 1 V
    D41-69 (VCIB) - D41-92 (EIB) P - BR Battery current sensor assembly Idling with warm engine 4.5 to 5.5 V
    D41-68 (IB) - D41-92 (EIB) W - BR Battery current sensor assembly Engine switch on (IG), battery thermometer sensor surrounding temperature -30 to 90°C (-22 to 194°F) 0.5 to 4.5 V
    D41-120 (THB) - D41-92 (EIB) B - BR Battery current sensor assembly Engine switch on (IG) 0.5 to 4.5 V
    D41-50 (ALT) - D41-104 (E1) B - BR Generator Engine switch on (IG) 11 to 14 V
    D41-51 (RLO) - D41-104 (E1) B - BR Generator After engine warmed up, during charging control, vehicle driven at constant speed Pulse generation (see waveform 1)
    D41-51 (RLO) - D41-104 (E1) B - BR Generator After engine warmed up, during charging control, vehicle accelerated Pulse generation (see waveform 2)
    D41-51 (RLO) - D41-104 (E1) B - BR Generator After engine warmed up, during charging control, vehicle decelerated Pulse generation (see waveform 3)

    1. A01CFN3E07

      WAVEFORM 1

      Generator
      Symbol (Terminal No.) Between RLO and E1
      Tester Range 2 V/DIV., 50 ms./DIV.
      Condition After engine warmed up, during charging control, vehicle driven at constant speed

      Tech Tips

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

    2. A01CD3UE06

      WAVEFORM 2

      Generator
      Symbol (Terminal No.) Between RLO and E1
      Tester Range 2 V/DIV., 50 ms./DIV.
      Condition After engine warmed up, during charging control, vehicle accelerated

      Tech Tips

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

    3. A01CAYTE06

      WAVEFORM 3

      Generator
      Symbol (Terminal No.) Between RLO and E1
      Tester Range 2 V/DIV., 50 ms./DIV.
      Condition After engine warmed up, during charging control, vehicle decelerated

      Tech Tips

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