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2004 Nissan Sentra--No signal to injector
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Speedy
Novice
Aug 10, 2015, 10:34 AM
Post #1 of 12
(1951 views)
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2004 Nissan Sentra--No signal to injector
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Getting persistent CES light. Have replaced ignition coils, spark plugs and fuel injectors. Checked DC signal to injector harnesses-All 12 volts. Upon recommendation from electrical engineer friend, I checked AC signal--23 volts on all but # One, which was 0.0 VAC. According to all wiring diagrams I've been able to find, they all run off the same fuse, so I don't understand how only one can be missing a signal. Anyone have any ideas. Thanks in advance for any help.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 10, 2015, 11:40 AM
Post #2 of 12
(1946 views)
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Re: 2004 Nissan Sentra--No signal to injector
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There is no AC voltage. They receive a constant 12V power supply and the computer supplies a pulsing ground to control them. You need to first check for power supply and then use a noid light to check for pulse.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Speedy
Novice
Aug 10, 2015, 3:06 PM
Post #3 of 12
(1935 views)
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Re: 2004 Nissan Sentra--No signal to injector
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Noid light varies between no light at all and a very faint but pulsing light on #1. The other cylinders are brighter and blinking. Car is putting out a lot of white smoke and idling rough, especially when shifted out of Park into gear.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 10, 2015, 4:22 PM
Post #4 of 12
(1933 views)
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Re: 2004 Nissan Sentra--No signal to injector
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Sounds like you have an issue with that injector harness. First thing is to make sure the power supply is solid and then I would try the same test at the PCM pin for that injector to see if it is acting the same.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 11, 2015, 6:05 PM
Post #5 of 12
(1909 views)
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Re: 2004 Nissan Sentra--No signal to injector
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Does that white smoke smell like raw fuel?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Speedy
Novice
Aug 14, 2015, 3:21 PM
Post #6 of 12
(1889 views)
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Re: 2004 Nissan Sentra--No signal to injector
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Yes, very much so. In fact, it leaves a dampness on the ground beneath the exhaust pipe that appears to be fuel, at least in part
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 14, 2015, 4:32 PM
Post #7 of 12
(1881 views)
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Re: 2004 Nissan Sentra--No signal to injector
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I would say you have a stuck open or leaking injector. Which engine does this have?
Did this start happening with the raw fuel in the exhaust after you did the injectors?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 14, 2015, 4:36 PM)
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Speedy
Novice
Aug 14, 2015, 5:46 PM
Post #8 of 12
(1875 views)
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Re: 2004 Nissan Sentra--No signal to injector
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I have the 1.8L engine. It got worse after the injectors were changed. It ran a bit rough before, but I hadn't noticed exhaust smoke.
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 14, 2015, 5:56 PM
Post #9 of 12
(1870 views)
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Re: 2004 Nissan Sentra--No signal to injector
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It is possibly that you got a defective injector that is stuck open. You should pull the fuel rail up with the injectors connected. Then turn on the ignition to prime the fuel rail or bypass the fuel pump relay to manually pressurize the rail. You'll see if any injectors are leaking.
It is also possible that a control wire got pinched and an injector is turned on all the time, so make sure you visually inspect for injectors spraying with the key on with the injector electrical connectors connected and disconnected to rule out an electrical issue.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 14, 2015, 5:56 PM)
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Speedy
Novice
Aug 17, 2015, 9:53 AM
Post #10 of 12
(1842 views)
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Re: 2004 Nissan Sentra--No signal to injector
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Throwing in the towel on this POJ ... Took it to a shop this morning. I'll post their diagnosis once I get one. 
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Speedy
Novice
Aug 30, 2015, 5:32 PM
Post #11 of 12
(1814 views)
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Re: 2004 Nissan Sentra--No signal to injector
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The problem turned out to be that the coils I had gotten were crap, one was replaced with a new OEM one and two was replaced with one of the original ones after it was tested. Light has been off for a week and a half or so, hopefully will stay off. To all who weighed in on this, THANK YOU!!
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 30, 2015, 5:43 PM
Post #12 of 12
(1811 views)
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Re: 2004 Nissan Sentra--No signal to injector
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Good to see you finally got your issue resolved  Thank you for the follow up. Closed as solved.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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