1990 Mazda B2600 Engine missing

I unpluged all injectors ---i have power on 1 side of plug other side of wire has nothing even when grouned with 4 injector wire where to go next? Light does not come on with tester--is wire bad?

I cant get to the 2nd and 3rd injectors good enought to test they are behind everything I retried several times between 1and 4 and 4 and 1 with nothing on the one side. Could a ground cable be the blame --i see a couple wires grounded to intake manifold I guess ---should I remove the short wire harness for truck to get to it easier? Oh yea thanks for all this

Do I connect all iijectors back up and plug in cpu after connecting a jumper from 1 to 4 befor ei try to start motor or how do you mean test with jumper

After a few test I tried to ground 4 and check from 2 and I am getting current --its 1 and 3 and 2 and 4 so now I am lost for sure--power is right if I test 2 and 4 I ground 4 and test 2 with light working so not the ground could distrubitor keep it from fireing injectors?---I did disconnect all injectors and cpu tested 1to 4 nothing tested 2 to 4 with a responce when grounded to frame light worked

Ok since it seems 1 and 3 and 2 and 4 are sets and 2 and 4 both arent working are we now looking at a bad cpu?

I looked at wires tthe second and 4 th injectors have the same wire color the 1st and 3 have same color wires. If I ground the 4th injector and test the second I get a light when I remove ground on 4 the light goes out. The same when I ground 3 and test 1 I get light when I remove ground from 3 light goes out when I test 1 to 4 I get nothing--

Light Green/Red wire these are the wirecolor for 1 st cylinder also same color on 3rd cylinder

Mazda four cylinder engine error codes 1989-1994
After the engine has been operated and the key subsequently shut off, it is not necessary to restart the engine to retrieve the error codes. This is true as long as the storage battery has remained connected to the truck.

Make sure the ignition is in the "off" position. On the drivers side under the hood, on the MPV at the junction of the grill and fender there should be located a single wire as part of a small bundle of connectors. On the pickup the connector is near the firewall on the passengers side. The singe wire will have a single green connector. This wire/connector should be connected to the chassis of the truck to allow the ecm to flash the error codes.

Get in the drivers seat and turn the key to the "on" position. The check engine light should come on for a few seconds and then go out. If there are any error codes stored, the light will start displaying the codes at this time. A long flash will be for a "10" short flash for "1", eg. Code "25" will be two long followed by five short flashes. The ecm will continue to flash until all codes are displayed and then start the sequence again.

Did nothing for meand yes there is a single green plug on passenger side as stated in directions

I do need the help. Only trying to convay what I am seeing.I connected 1 to a test light with cpu unpluged and injectors unpluged and ground 4 with no result--if I ground 3 the light comes on if I ground 2 light does not come on

At distubitor the plug that plugs into side if distrubitor.4 wires look alot those on injectors----i tested with switch on 3 wires showed power 1 none--the 3rd wire showed bright lite on tester the 2 nd 1st shows but very dim connector looks very bad

Im just list--after good inspection I unpluged wire to distrubitor and found inside crumbling apart-could bires be messing things up indide this 4 wire plug to my distrubitor

Cant do much testing till I replace connector. Would you know where I could find a part like that. None in my area