Pic. 7.51. Location of the vehicle ignition ECU «Escort RS 1600». The arrows indicate the cover screws.
The necessary information enters the computer from the crankshaft position sensor, installed at a certain distance from the flywheel. Based on this information, the ECU selects from the values \u200b\u200bof the ignition timing stored in its memory (UOP) optimal for given engine operating conditions and provides signals to two high energy ignition coils with two high voltage outputs each.
Spark discharge occurs simultaneously on two spark plugs (1 and 4 or 2 and 3 cylinders). a working spark discharge occurs at the end of the compression stroke, and an idle spark discharge occurs at the end of the exhaust stroke.
Characteristics of the electronic ignition system
The minimum voltage for system operation is 5.6 V.
The resistance of the primary winding of the coil is not more than 1.6 Ohm.
The resistance of the secondary winding of the coil is 15 kOhm + 15%.
The distance between the crankshaft position sensor and the flywheel is 0.8-1.2 mm.
Spark plugs - Champion RC 6 Y or Motorcraft AGP 902.
Pic. 7.69. Connection diagram of power supply, ignition and engine start systems with ECU.
1 - spark plugs; 2 - crankshaft position sensor; 3 - electromagnetic shut-off valve; 4 and 5 - connectors; 6 - ignition coils: 7 - control pressure regulator; 8 - valve for additional air supply; 9 - thermal time switch; 10 - coolant temperature sensor; 11 - starting nozzle; 12 - throttle position sensor; 13 - tachometer wire (in the main tourniquet); 14 - fuses in the mounting block; 15 - relay V; 16 - front end shield; 17 - ECU of the ignition system; 18 - control lamp of the electromagnetic shut-off valve; 19 - ignition switch; 20 - safety relay for ignition and power systems; 21 - fuse; 22 - fuel pump.
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