i have a d16a6 in a 90 civic. is the computer ps9 zc? because my fan doesnt turn on and i dont think it knows how hot its getting and the fan motor is good and connections are clean and good

 

the PS9 ECU is the factory ECU for the D16A6 engine in the 90-91 Civic EX with automatic transmission

the cooling fan should turn on when coolant temperature reaches about 195 degrees - first, check fuse #15 in the under dash fuse box - if the fuse is o.k., check to make sure the fan motor is o.k. by running wires directly from the battery to the fan, black/yellow positive and blue negative - if it is o.k., check the cooling fan switch, which is on the back of the block next to the oil filter - should have a big round black boot on it - unplug the connector and connect the 2 wires together - turn on ignition and the fan should come on - if it does, then the switch in the block is bad - if it still doesn't come on, check the fan relay which is on the passenger side inner fender panel just behind the headlight - see attached

 

awesome dude no one else gives me pics, thanks

 

right now i my computer is throwing code 20 witch is ELD that i know, would that cause my car to not let the thermostat open and let the water threw? and its a 1990 civic with a 92 engine and the temperature switch plug isnt there but the temp on the gauges goes up and stays in the normal mark but i know its hotter than that because the hose's are streched. any answers?