CHARGING SYSTEM TERMINALS OF ECM


  1. CHECK ECM

    A01M1DYE07

    Tech Tips

    The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal 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.

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    B186-117 (VCIB) - B186-39 (EIB) P - R Power source of battery current sensor assembly Ignition switch ON 4.5 to 5.5 V
    B186-61 (LIN) - Body ground R - Body ground LIN communication line Ignition switch off 10 kΩ or higher
    B186-87 (THB) - B186-39 (EIB) L - R Battery temperature sensor (built into battery current sensor assembly) Ignition switch ON 0.2 to 4.8 V
    B186-86 (IB) - B186-39 (EIB) B - R Battery current sensor assembly Ignition switch ON 0.2 to 4.8 V
    B186-59 (E1) - Body ground BR - Body ground Ground Always Below 1 Ω
    A50-1 (BATT) - B186-59 (E1) P - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
    A50-18 (INH) - B186-59 (E1) R - BR Wiper switch signal Ignition switch ON, wiper switch HI position 11 to 14 V