4WD Switch (Tacoma, T100 & 4Runner)
On 4WD models, 4WD switch on transfer case delivers an input signal to 4WD terminal of Engine Control Module (ECM) to indicate 4WD operation.
On 4WD models, 4WD switch on transfer case delivers an input signal to 4WD terminal of Engine Control Module (ECM) to indicate 4WD operation.