Question about 1999 Nissan Altima

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1999 Nissan Altima: Circut board question

Trying to narrow down which circut sends electricity to fuel injectors.

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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.

Posted on Apr 05, 2009


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1999 Altima stutters, surges and stalls

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 ?

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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.

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2005 nissan almera,1.5letre.. fault code po725

P0725 NISSAN - Engine Speed Signal

The P0725 Codes is triggered when TCM does not receive the engine speed signal from ECM.

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes:
- Open or shorted CKP sensor circuit condition
- Poor CKP sensor electrical connection
- Check communication error between the ECM and TCM
- Failed CKP Sensor

Possible solution:
Very common problem with Nissan vehicles, usually replacing the Crankshaft Position sensor takes care of the problem.

Keep us updated.

Feb 12, 2011 | 2005 Nissan Altima

1 Answer

1992 Lumina Euro 3.1 MPI, what tells the injectors to shoot gas? Not getting the proper fuel through the injectors and the proper time.

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...

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Alternator good, new battery, but battery keeps dying

you have an open circut in the electrical system the easiest way to find the problem is to disconnect the neg side of the battery and hook up a test light to the cable and the post then have someone watch it as you remove the fuses one at a time till the light goes out when the light goes out that is the open circut (most of the time it is the cigarette lighter circut

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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.

Oct 23, 2009 | 2000 Buick LeSabre

1 Answer

2001 Chevy S-10 fuel pump circut

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.

Mar 13, 2009 | 2001 Chevrolet S-10

1 Answer

Code p0201 & p0443

The problem to code in the car could any one this

P0201 Injector Valve 1 Voltage High C-20
P0201 Injector Valve 1 Voltage Low C-20
P0201 Injector Valve 1 Open Circuit C-20
and for the code is P0443:

P0443 Fuel Tank Ventilation Valve Voltage High C-29
P0443 Fuel Tank Ventilation Valve Voltage Low C-29
P0443 Fuel Tank Ventilation Open Circuit C-29...........

there is value failure in your car...........................

Jun 14, 2008 | 1999 Buick Regal

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