Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

main relay doesnt have power

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Old Feb 27, 2012 | 06:03 PM
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Icon2 main relay doesnt have power

Its a 99 em1
Yes i have searched.well my fuel pump wont turn on my ecu doesnt have power so i checked my main relay and it doesnt have a constat 12v wire it has a wire that gets power with ign on and a wire that gets power when cranking the car but it diesbt have a constant..now from what i read if it doesnt have a 12v constant my fuel pump or ecu wont get power.my question is where does this wire get power from and y doesnt it have power..ive checked all my grounds they are good...fuses are all good so im stumped where else can i look to try and get this thing fixed...also i ran a wire from my battery to my fuel pump to see if it primes and it doesnt,SHOULDNT IT prim with a direct power...someone help me on this i need my car running
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Old Feb 27, 2012 | 06:04 PM
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Default Re: main relay doesnt have power

Also replaced main relay with a known good one and its still the same thing
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Old Feb 27, 2012 | 06:04 PM
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Default Re: main relay doesnt have power

Originally Posted by milanoitr
Its a 99 em1
Yes i have searched.well my fuel pump wont turn on my ecu doesnt have power so i checked my main relay and it doesnt have a constat 12v wire it has a wire that gets power with ign on and a wire that gets power when cranking the car but it diesbt have a constant..now from what i read if it doesnt have a 12v constant my fuel pump or ecu wont get power.my question is where does this wire get power from and y doesnt it have power..ive checked all my grounds they are good...fuses are all good so im stumped where else can i look to try and get this thing fixed...also i ran a wire from my battery to my fuel pump to see if it primes and it doesnt,SHOULDNT IT prim with a direct power...someone help me on this i need my car running
have you installed a new fuel pump or adjustable FPR lately???
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Old Feb 27, 2012 | 06:50 PM
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Default Re: main relay doesnt have power

Check whether 15A hood fuse 44 or 15A dash fuse 13 is blown.
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Old Feb 27, 2012 | 07:18 PM
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Default Re: main relay doesnt have power

Originally Posted by Civic2Fast
have you installed a new fuel pump or adjustable FPR lately???
No i have installed any of those lately
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Old Feb 27, 2012 | 07:27 PM
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Default Re: main relay doesnt have power

Originally Posted by Civic2Fast
have you installed a new fuel pump or adjustable FPR lately???
No i have installed any of those lately....all fuses under hood and under dash are good
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Old Feb 27, 2012 | 07:33 PM
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Default Re: main relay doesnt have power

Originally Posted by milanoitr
.all fuses under hood and under dash are good
I not worried about any fuses but the two I mentioned. Do both of those installed fuses have battery voltage at both top test tabs?
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Old Feb 27, 2012 | 07:53 PM
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Default Re: main relay doesnt have power

Originally Posted by RonJ@HT
I not worried about any fuses but the two I mentioned. Do both of those installed fuses have battery voltage at both top test tabs?
Yes both have battery voltage
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Old Feb 27, 2012 | 08:23 PM
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Default Re: main relay doesnt have power

Unplug the main relay, turn the key to ON(II), and then jump terminal 7 to terminal 4 (7-4). Does the fuel pump run? Do the same test for 5-4. Does the fuel pump run?

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Old Feb 27, 2012 | 08:39 PM
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Default Re: main relay doesnt have power

When i jump terminal 5 and 4 it turns on jumping 4 and 7 it doesnt
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Old Feb 27, 2012 | 08:44 PM
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Default Re: main relay doesnt have power

Originally Posted by milanoitr
When i jump terminal 5 and 4 it turns on jumping 4 and 7 it doesnt
Are you absolutely sure that installed fuse 44 has battery voltage on BOTH top test tabs? Click the fuses link in my signature.
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Old Feb 27, 2012 | 08:49 PM
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Default Re: main relay doesnt have power

Yes my test light lights up on both ends of the fuse with the ignition on
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Old Feb 27, 2012 | 09:02 PM
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Default Re: main relay doesnt have power

When i turn ignition on my fuel pump doesnt prim,also igp1 and 2 dont get power on my ecu plug.but the yellow/black wire on connector c101 has power
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Old Feb 27, 2012 | 09:45 PM
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Default Re: main relay doesnt have power

Test continuity of the wire running from fuse 44 to the main relay plug.
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Old Feb 27, 2012 | 09:57 PM
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Default Re: main relay doesnt have power

Originally Posted by RonJ@HT
Test continuity of the wire running from fuse 44 to the main relay plug.
Where do i find the wire running off fuse 44 at and what prong on the relay plug
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Old Feb 27, 2012 | 10:00 PM
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Default Re: main relay doesnt have power

Can i just run a wire off the yellow/black wire on the c101 connector to prong 7 on the main relay???
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Old Feb 27, 2012 | 10:06 PM
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Default Re: main relay doesnt have power

Originally Posted by milanoitr
Where do i find the wire running off fuse 44 at and what prong on the relay plug
It's the Wht/Blk wire. Measure continuity between installed fuse 44 and terminal 7 of the main relay plug.
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Old Feb 27, 2012 | 10:11 PM
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Default Re: main relay doesnt have power

How to i check continuity?? And is the white/black on the main relay supposed to be the one with a constant 12v
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Old Feb 27, 2012 | 10:42 PM
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Default Re: main relay doesnt have power

Ttt
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Old Feb 27, 2012 | 10:55 PM
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Default Re: main relay doesnt have power

You test for continuity using a voltmeter set to continuity mode.
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Old Feb 28, 2012 | 03:25 AM
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Default Re: main relay doesnt have power

Looks like i need to get a voltmeter ...if there is no continuity what can the problem be
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Old Feb 28, 2012 | 03:34 AM
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Default Re: main relay doesnt have power

Originally Posted by milanoitr
Looks like i need to get a voltmeter ...if there is no continuity what can the problem be
wire would be split in two, meaning no power. i would do a volt drop test to be sure. checking for continuity will only tell you that there is contact but wont tell you if you have power going through and how much. a DMM from any auto parts store will work, and also comes with instructions on how to do a volt drop.
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Old Feb 28, 2012 | 03:50 AM
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Default Re: main relay doesnt have power

I dont have any power to the #7 prong on the main relay so will there even be a point to doing a continuity test
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Old Feb 28, 2012 | 06:14 AM
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Default Re: main relay doesnt have power

Originally Posted by milanoitr
I dont have any power to the #7 prong on the main relay so will there even be a point to doing a continuity test
The test was to verify the problem.

Pierce the insulation of the Wht/Blk wire a few inches from the main relay plug. Do you measure battery voltage there?
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Old Feb 28, 2012 | 08:14 AM
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Default Re: main relay doesnt have power

Ill try that when i get home
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