ELECTRONIC CONTROL UNIT (ECU)
The ECU utilizes an integrated circuit containing the digital fuel injection control chip and an analog-to-digital converter to translate information from the sensors. The fuel injection program is stored in a Read-Only-Memory (ROM) chip.
For any given manifold pressure and engine speed combination, the memory provides a fuel injection duration for optimum combustion. The ECU also monitors other sensors to modify the basic speed and pressure signals so that cold starting, mixture adjustment and other areas of engine operation can be controlled.

Answered by Dave H (expert)
13,680 answers provided

Hello can anyone help me im a mazda mechanic i have a 89 xjs v12 it ran great it seemed then the regulators flooded the car i replaced both car didnt start for a day i figurrd was floided went out fired up ran fibe warmed up shut off restarted like 4 times drove 30 miles shut it off and wont start even days later got fuel psi got spark starts on starter fluid ( when keys on fuel pump never shut off always ran but car worked. I found loose ground wires by the radiator on both sides who knows how long i tightned still nothing seems as if injectors rnt opening everything else is a ok (ecu problems)? Is there a way to check it or do i just start replacing more stuff 7174199811 any hekp greatly appreciated

Answered by 89xjsmazdaman
1 question asked