Question about 1991 Honda Civic

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91 CIVIC SI HB

THIS MORNING I REPLACED THE INSTRUMENTAL FUSE BUT THE SWITCH WAS ON MOTOR OFF AND I KEEP PULLING THE REST OF THE FUSES OUT TO CHECK THEM OUT AND WENT I TRY TO STAR MY CAR WAS HARD AND THE ENGINE LIGHT WAS ON WHAT CAN I DO T FIX IT ?

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  • CIVICITO Oct 13, 2008

    PLEASE HELP ME

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See what code is throwing the check engine light. To check the code pull back the carpeting floor on the passenger side under the dash and you should see the car's main ECU with a little window and an LED bulb flashing when the car is in the on position. You have to count the amount of flashes it gives off...the way to read is it will give slow flashes first, then fast ones. So for example it may flash once, pause, the fast 3 times...that would then mean it's throwing a code 13. Once you figure out the code and what that code is for then u can go from there. Good luck!

Posted on Nov 03, 2008

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Disconnect the electrical at the top. Sometimes you can get the fan out and then the shroud-due to limited space. They would both come out from the top.
We mechanics will tell you to test the fan motor with jumper wires from the battery before you decide to pull it off. On most cars, the computer turns the fan on through a cooling fan relay. On your '87, it is possible that a thermal switch on the radiator may turn the fan relay on at a set temperature. One would have to see a wiring diagram.

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There are no computer controls for the fan on an '87. there is a thermo switch-at a set temperature, the switch will close-completing the ground path for the fan motor. There is also a radiator fan timer switch, tied in with the thermo switch and the air temperature sensor.
Sound complicated? Well, it is, even with no computer controls. If the fan motor is good, check or replace the thermo switch. Be sure and check those fuses, also. If no help, a tech will probably have to diagnose it.

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