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A 1990 Ford Ranger is OBD I / EEC IV - if that's what you are asking
The EEC TEST connection should be in the engine compartment by the Power Distribution Box in a 1995 Ford Ranger ( EEC - IV , OBD I )
On a 1994 Ford Ranger ( which is OBD I , EEC IV ) should have an EEC TEST connection in the engine compartment ( P.S. I'm not a mechanic / technician )
On a 1992 Mercury Cougar ( which is OBD I , EEC IV ) There should be an EEC TEST connection in the engine compartment
A 1994 Ford Ranger is OBD I / EEC IV and has an EEC TEST connection in the engine compartment by the power distribution box In 1996 , the Ford Ranger changed from OBD I / EEC IV to OBD II / EEC V and has a Data Link Connector in the dash , below the steering wheel , covered by a small removable plastic panel
EEC Module is mounted on the wall under the hood on the driver side.
On a 1990 Ford Thunderbird : There should be an EEC TEST connection in the engine compartment for the OBD I , EEC IV system
What does the EEC test port have on the plug end and what does it do
The EEC TEST connection is in your engine compartment by the power distribution box ( OBD I / EEC IV )
There are two relays by the fuse block on the left side of the engine compartment. I believe the green one is the EEC relay. One may be located under the fuse block. Pull the 30 amp fuse for the EEC, locate on lid of fuse block, the relay should click when the battery cable is disconnected.
No , OBD II came out in 1996 There should be an EEC TEST connection in your engine compartment , near the battery for your OBD I / EEC IV system
on my '94 its next to the fuse panel under hood on drivers side hanging under a little cover. BTW on a '92 its not OBD its EEC