having trouble reading from the diagnostic connector

[4x494ranger]

i am having an issue trying to connect to the diagnostic connector when i hook up my scan tool. it keeps saying vehicle not responding when i run the koeo test so it wont retrieve the codes. does anyone know how i can test the connector or somehow resolve this problem?

 

[necessaryevil]

is it on your '94 ranger?

 

[BRUTUS_T_HOG]

i am having an issue trying to connect to the diagnostic connector when i hook up my scan tool. it keeps saying vehicle not responding when i run the koeo test so it wont retrieve the codes. does anyone know how i can test the connector or somehow resolve this problem?

did you also plug in the small 1 wire connector to your scanner?

 

[4x494ranger]

yes its on my 94 ranger and i plugged in all wires i also tried to clean all connectors and it still says vehicle not responding

 

[necessaryevil]

what kind of scanner are you trying to use?

 

[4x494ranger]

an innova 3140

 

[adsm08]

Check for power to the single wire.

Then check the diag connector fuse.

 

[necessaryevil]

ok so ive done some digging and asked a few people, and although your scanner will work for obd2 and "some" obd1, your truck being a'94 is the obd1, your scanner might not have the right software in it. i would recommend trying to pull the codes the old fashion way, there is a great article about it here: http://www.therangerstation.com/tech_library/OBD_I.html . if that doesnt work then make sure that you have GOOD power and ground to the plug, after that i would say check your harness plugs for corrosion.

 

[adsm08]

Or just go pay out the 3K for an NGS...

 

[4x494ranger]

how do i check for good power and ground what wires do i check? my scanner does work for my truck i called and made sure

 

[4x494ranger]

any 1?