Tacoma 4WD L4-164.4 2693cc 2.7L DOHC (3RZ-FE) (1996)
Engine Control Module: Component Tests and General Diagnostics
Component Test
INSPECTION
If, after performing individual component tests, it is determined that problem(s) may exist in the Engine Control Module (ECM), it will be
necessary to substitute a known good ECM and retest as needed.
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of the EFI main relay and supplying
power to the terminal +B of the ECM.
WIRING DIAGRAM