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Re: 1999 Nissan Altima: Circut board question
Dear cindy: Your injectors are served from the fuse block by a 10A fuse. This is a brown and red wire which goes directly to the injectors and is hot all the time. The ECM makes and breaks the ground to pulse the injectors.
Coming off the ECM, are four wires which are numbered as followed. pin #102 (#1 inj) red and black, pin #107 (#2 inj) yellow and black, pin #104 (#3 inj) green and black and pin #09 (#4 inj)blue and black. These all pulse the grounds and are triggered by the ignition pulse. I hope this has shed some light on the subject.
Often you can go to a Barnes and Noble book store and find shop manuals which will give you the diagrams you seek. You don't necessarily need to buy the book if you are seeking a specific answer. Good Luck.
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You will have to figure out if it is a fuel or spark problem to proceed. Vent in gas tank could be causing the pressure in the tank to cause a loss in pressure to the injectors. Something electrical such as a relay could be failing. Is the check engine light on when the engine is running ?
Gday ate, geoff here, well it would seem that the brake lights are trying to earth through the park light system as they are in the same socket in the rear, check the earths from the light pack at the rear, and the then go from there tracing the earth circut even to the point of cleaning rust, mould/moss from them,geoff.
The ecm (electronic control module ) operates the injectors. But their are many inputs that send information to the ecm for it to decide when and for how long to operate the injectors (it opertaes the injectors by actually providing a ground to the circut) .What makes you think its a fuel issue, do you have good fuel pressure...
Sounds like your going to be removeing it again.Take it back out and check the ribbon connecters to see if a copper strip has gotten rolled back or ripped off.While you have it out have a close look at the circut board for opens in any circut which you can repair by scrapping off the circut down to bare copper and the jump it some soldier and a piece of wire,good luck.
no that is not true. i have a sonoma and when i changed the fuel pump it was on its own circuit. the only special thing about the fuel pump is that it is a one piece assembly with the fuel level sending unit. so if you have to replace the sending unit you have to buy a whole new pump.