I have a 90 civic si with a obd-0 b16a all plugs except ECT are connected, doesnt turn over but gets fuel and is throwing a code 6 im sure its because of the Fan switch on the thermo housing. When i turn the key i can hear the ignition switch clicking and also the starter clicking but just doesnt crank. The battery was completely dead but was charged when i tried cranking it. Don't know what it may be, im thinking its not grounded enough or a short somewhere?

 

and im using a pr3 ecu

 

Code 6: Engine Coolant Temperature (ECT Sensor).
Hook up it up, reset ecu, swap out for a sure-fire 100%-you-know-it's-working battery, make sure it's completely grounded, then try.

Come back with results.

 

sounds like its the battery. check the battery connections and grounds. usually a clicking sound from the starter means dead battery.

 

did u check the grounds on thermostat housing had the same thing when i did my obd-0 b16 swap into my crx

 

swapped out for a good battery checked the grounds everything seems grounded properly and still no crank just the starter clicking. im going to go test the starter to see if its any good

 

try jumping the the starter with the ignition switch open

 

try ignition switch mine does the same thing but could start it by hot wiring the starter