Justy Hatchback 2WD L3-1.2L SOHC (MPFI) (1992)
Engine Control Module: Testing and Inspection
ECU Power Supply And Ground Circuit
NOTE: Never connect or disconnect the control unit or any sensors with the ignition "ON" unless specifically instructed to do so by a test
procedure. Failure to follow this precaution could result in damage to electronic components.
While there is no specific test for the ECU, nor does it set a trouble code if a fault occurs in its own circuitry, many of the component tests lead to
the ECU if no other problems are detected.
ECU Power Supply Testing
ECU POWER SUPPLY
1.
Turn ignition switch "ON."
2.
Measure voltage between ECU connector terminals and ground on vehicle body. Specified voltages and connector terminals are listed in the image
table.