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Home > Home & Garden > Cars & Trucks   »   1991 Honda Civic Si, No ECU LED

 
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Old May 4, 2007, 03:02 PM
Jerry321
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1991 Honda Civic Si, No ECU LED

My honda will not show any indicator lights on the ecu, i bought a new ecu and im still showing no indicator lights. i took off the distributer, and changed that brown relay(ignitor maybe?), same thing, the check engine light stays on, i do not hear the fuel pump, i do hear the main relay click. i am getting power to the computer, and ive tried 3 different distributers..i also have no headlights, but i do have side markers and hazards, the car is a birthday present for my girlfriend, rims body kit the whole jazz.. PLEASE HELP!Thanks in Advance !!!
Jerry

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Old May 4, 2007, 04:10 PM   #2  
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Check all under-dash (most likely) and under-hood fuses with a test light or multimeter. Here's how:

http://www.askmehelpdesk.com/cars-tr...tml#post252145

Be sure and test the ACG (ALT) (S) fuse, which controls power to the main relay's first relay. The first relay controls power to the ECM, power to the fuel injectors, and power for the second relay. You should be up and running in no time.

If it's not a bad fuse, which I think it is, then perform the tests outlined below:

http://www.askmehelpdesk.com/cars-tr...tml#post358044
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Old May 4, 2007, 05:06 PM   #3  
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where is the ACG ALT fuse, also i only hear 2 clicks from the main relay, last one is supose to initiate the fuel pump, i think?

Thanks
Jerry
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Old May 4, 2007, 05:10 PM   #4  
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With a test light or multimeter, you can test all under-dash and under-hood fuses in 3 minutes. It may be fuse no. 12 or 24. Honda gives you several spare fuses in the box. The ACG (ALT) (S) fuse is 15 A.

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Jerry321 agrees: helped me find my problem, GREAT JOB
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Old May 4, 2007, 05:15 PM   #5  
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Does it run?
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Old May 4, 2007, 05:36 PM   #6  
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the car is almost firing, i put some gas down the spark tunnel, and shes almost going.. but i still dont hear the fuel pump and im posative its the fuel relay. i just cant find it. can you tell where that might be? been a great help so far Thanks again
Jerry
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Old May 4, 2007, 05:46 PM   #7  
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Does the Check Engine Light come on for 2 seconds and then go out? Here's where the main relay is located for your Civic:

Honda Civic main relay Location

Turning the key on and off will help you locate it. It's normally mounted with a 10 mm bolt. Remove the lower dash cover and fuse box cover to gain greater access.

If need be, jump terminals 5 and 7 on the connector to the main relay; then, you should hear the fuel pump run, when you turn the key to ON.

If the CEL does not go out, the problem is with a fuse, main relay, ignition switch, or ECM. Run your tests in that order.
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Old May 4, 2007, 05:58 PM   #8  
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yes now that ive changed that fuse it comes on then goes out. before it stayed on...
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Old May 4, 2007, 06:03 PM   #9  
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Great. Now your chances of getting it to run are greatly improved. Do you hear the fuel pump run for 2 seconds, while the CEL is on?
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Old May 4, 2007, 06:13 PM   #10  
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thats my problem, i think its the fuel pump relay thats mighgt be gone....so no i dont hear it....:S
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