a2 is the (the start/crank ) pin, this pin goes hot, cranking, from the spring loaded, cranking position of the key switch.
no, the table there is very simple.
to see who it real works , see my schematic page. see A2? (off schematics page)
http://www.fixkick.com/ECU/92-95MPI-eng-...e-huge.png
see a2, its 0v keyoff or on, then, 12vdc cranking, and 0v when you release the key, its the same wire and same color that goes to starter solenoid, (tiny lug)
sorry, the ECU runs off sensor inputs, to do spark advance and fuel rates.
the fuel rates are run at 02 sensed levels. . called STOICH. 14.7:1 air to fuel ration, at cruise. but...
the acceleration rates (the 02 drops off line) and the ecu uses MAF, RPM and load calculations.
there are tables (many other too) (computer tables i memory ) for load.
based one engine sizes, car body weight. and load is calculated by SPEED and air flow into engine (maf) the ECU injects fuel. by many factors.
The VSS does help the engine make more power, going fast and up hills.
the vss , is just reed switch clicker in the speedo. (magnetically tripped)
see speedometer sensor. next (its just a reed relay , seen here.) so many clicks per mile.
here it is , back side of SPEED head.
showing the vss , being slid out.
![[Image: speedo-guts2.jpg]](http://www.fixkick.com/sensors/speedo/speedo-guts2.jpg)
on new cars the Vss is a transmission tail shaft, hall sensor
on my car, the ecu steals speed from ABS sensors. ( no actual vss exists on my new 6 speed m/t car) wow....
summit racing sells them in kits at crazy prices.
or get the newer sammi head that had EFI. 1990 to 1998 (last ever)
in your car, new , long ago.
the a2 pin is the clutch , is depressed now, and cranking pin signal.
id bet your clutch switch is missing, so is now just a cranking signal.
no, the table there is very simple.
to see who it real works , see my schematic page. see A2? (off schematics page)
http://www.fixkick.com/ECU/92-95MPI-eng-...e-huge.png
see a2, its 0v keyoff or on, then, 12vdc cranking, and 0v when you release the key, its the same wire and same color that goes to starter solenoid, (tiny lug)
sorry, the ECU runs off sensor inputs, to do spark advance and fuel rates.
the fuel rates are run at 02 sensed levels. . called STOICH. 14.7:1 air to fuel ration, at cruise. but...
the acceleration rates (the 02 drops off line) and the ecu uses MAF, RPM and load calculations.
there are tables (many other too) (computer tables i memory ) for load.
based one engine sizes, car body weight. and load is calculated by SPEED and air flow into engine (maf) the ECU injects fuel. by many factors.
The VSS does help the engine make more power, going fast and up hills.
the vss , is just reed switch clicker in the speedo. (magnetically tripped)
see speedometer sensor. next (its just a reed relay , seen here.) so many clicks per mile.
here it is , back side of SPEED head.
showing the vss , being slid out.
on new cars the Vss is a transmission tail shaft, hall sensor
on my car, the ecu steals speed from ABS sensors. ( no actual vss exists on my new 6 speed m/t car) wow....
summit racing sells them in kits at crazy prices.
or get the newer sammi head that had EFI. 1990 to 1998 (last ever)
in your car, new , long ago.
the a2 pin is the clutch , is depressed now, and cranking pin signal.
id bet your clutch switch is missing, so is now just a cranking signal.
http://www.fixkick.com