[roadster150]

My loaner sled, been stored for 2yrs. No run, have good fuel press. have spark,no injector signal,hooked up noid light no flash, notice computer has 2 rubber plugs on side, some sort of adjustment inside? have no manual for this model,unplugged computer nocorroded terminals,what else to check?

 

[mrholmquist]

Is the ready light coming on on the dash?

Does the fuel pump cycle a few seconds each time you pull the cord?

 

[roadster150]

92 indy 500 efi

yes ready light comes on for a period of time,fuel pump cycles on, good fuel to the rail.

 

[mrholmquist]

so the fuel pump cycles each and every time you pull the cord as well as when you turn the key on for the first time?

If so locate the red led on the side of the ECU and after trying to start it two or three pulls check to see if it is flashing any fault codes

 

[roadster150]

92 indy 500 efi

yes got it to flash a code 22, 2 slow flashes and 2 fast flashes, have power to injector but no signal.

 

[roadster150]

more tests

tested continuty from Blk wire on cdi to wht/red on ecu was good,have signal on blk wire from cdi when cranking. pump does not appear to be running when cranking its hard to tell.fuel pump pressure was good @ 38-40 psi when key is first turned on. suspecting bad ecu so far.

 

[mrholmquist]

let's concentrate on the injector code for now....

12v is supplied from the battery throught the green fuse link behind the key switch to the dropping resistor. From the dropping resistor it is split and supplied to each of the two injectors via the blue/yel and the blue/w wires respecively. The light green and the light green black wires complete the connection from the individual injectors to the ECU.
When there is no ground supplied to this circuit and as long as there is no breaks in the line along the way you should normally be able to read 12v anywhere along the circuit using a voltmeter. The ECU expects to see 12v on both of the wires coming from the injectors whenever it is not supplying a ground to them. If it does not read voltage it will set the code. When the computer grounds the injector circuits it then expects to see 0v on those wires ..... if not you will also get an injector code.
unplug the ECU and you will find the light green wire and the light green/white wires adjacent to each other in the corner of the smaller connector. Check to voltage of these wires with a meter still leaving the ECU unplugged. Again the correct reading would be 12v. If you don't read 12v you must have a break in the harness , backtrack until you find it.

 

[roadster150]

Ohmed out all wires to and from injectors,ign. and dropping resister all good. Found a used ECM on the classified forum, installed it,started w/ one pull ran sweet.Thanks to mrholmquist for the good diag. info.