Question about 1997 Nissan Maxima

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While driving lights started pulsing and car shut off. Would a bad battery ground wire have anything tod do with this situation? How about the alternator?

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This would either be cause by bad battery connection, or faulty altenator or battery which both can be tested for free at local part store

Posted on Sep 09, 2009

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Could be either you should get it tested.

Posted on Sep 09, 2009

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Thats is your battery

Posted on Sep 09, 2009

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1 Answer

Has spark no injector pulse has power to the injectors


No pulse means the injector ground side is absent, since you have power to the injectors. The ground wire goes into the engine computer to be internally grounded for the pulse. You can test the injector ground side with a test light, as a verification of it not having pulse. If it really has no pulse, but it has correct voltage to the injector solenoid, then you have a bad injector, or a bad ground wire to the pcm, or a bad pcm.

Use a test light with a ground clip and a needle-type probe. Unplug the injector connector and note which is the power wire terminal and which is the ground wire terminal. Clip the test light lead to the POSITIVE battery post, and put the probe into the injector's ground wire terminal. Now have someone crank the engine over and watch for a blinking light on the tester. If you have a blinking light, the injector ground side is working right, so check if voltage to the injector is correct, or if you have a bad injector. If you have no blinking light, then no pulse is correct. You will need to check the ground wire to the computer before assuming a bad computer. I think they are called quad drivers inside the computer that control the injector grounds.

Best way to check that ground wire is, first, take off the negative battery cable, then pull off the computer connectors, then use an ohmmeter to check resistance of wire from injector terminal to the pin on the computer's connector. Low resistance, low ohms, means the wire is good. ...But first I guess you will have to find the pin-out diagram for the computer, where and on which connector that ground wire goes in at. There's around a hundred or more wires going in, so color coding, tracing by the color of the wire would be a royal pain. Good luck, Scott.

May 07, 2015 | Cars & Trucks

1 Answer

Sunfire would not turn over after parking


check all of your grounds a bad ground or a shorted ground can trigger stuff to go off at random plus if it started right up when you got the car jumped then yea it has to be a bad ground like i said check all of your ground wires and update me with the situation

Oct 18, 2013 | 2000 Pontiac Sunfire

1 Answer

I have replaced the fuel pump on my 1991 chevy cheyenne im getting fuel to the injectors but they aint working


Check the injector fuse. With key on, injectors should have constant power available to them on one wire. The other injector wire is ground wire. With constant power to injectors, all it takes to pulse the injectors is for the computer to ground the injector ground inside the computer for a split second, and pulse occurs, causing fuel to spray out the injectors.
So if injectors aren't working, either the injector drive circuit (the power to injectors) or the injector ground circuit is lost. You can buy a cheap "noid light" at any auto parts store, and check the injector circuit. Just plug the light into the injector connector and crank the engine over. If the light is blinking, circuit is good. If no light, the circuit has a problem, either on the drive side or the ground side.
Here's a way to check the ground circuit separately. Use a test light clipped to the Positive battery post. Probe the ground wire terminal of the injector connector while the engine is cranked over. The test light should be blinking-meaning the computer is grounding the circuit normally and would be causing the injectors to pulse, if power is available to them.

Aug 19, 2013 | Cars & Trucks

1 Answer

No injector pulse on daewoo nubira i change computer box but still no pulse wot must i look for or replace


Check for an injector fuse in the fuse box under hood. Pull off one injector connector and use a testlight to check for a steady power signal on one of the two wires, with key on. Should have power on one wire. If not, pull all injector connectors off and check again-a shorted injector can shut down the injector drive circuit-if power now, reconnect injectors one at a time. If one connection causes power to be lost, that is a shorted injector. Replace it. If still no power and fuse is good, you will need a wiring diagram to check injector drive circuit.
If you have voltage at the injectors with key on, move the test light ground lead to the battery positive post, and put the test light probe on the injector wire that did not light the test light. Now have a helper crank the engine over-you should have a blinking light on this ground circuit. If no light, or light is not blinking, the ground circuit between injector and computer is bad. See? Steady power is available to injector anytime key is on. When the computer internally grounds the injector circuit for a split-second, the injector is energized, causing the pulse.

Mar 22, 2013 | Cars & Trucks

1 Answer

Soon as I start car sometimes all lights flicker and sometimes while Im driving lights flicker and car shuts off starts back up car is 99 buick lesabre


Check all your ground wires. There will be several wires connecting
ultimately to the negative side of the battery. Usually at least 2
wires are connecting the body of the vehicle to the negative side
of the battery. Generally, the lights are grounded to the body which
is grounded either to the engine block or directly to the battery.

Jan 01, 2013 | Cars & Trucks

1 Answer

1996 cavaler not getting fuel throu injectors but pump is working fuel to injectors but injectors not palsesating what is the problame


Check for a fuse for the injectors in the power distribution box by the battery. Parts stores sell a cheap little tester called a "noid light" for testing injector circuits. They come in several sizes, so get the one that fits your injector connector. To use it, you pull off one injector connector and plug in the test light. If the circuit is good, the light will be blinking when the car is cranked over. If you get nothing, pull off all the injector connectors and test again. If you have one shorted injector, it may have shut down your injector drive circuit- that's why to pull off all connectors and re-test.
Here's a brief on how the injector circuit works: When key is on. the injectors will have constant battery voltage available to them on the power side (the injector drive circuit). When the engine is cranking or running, the engine computer will momentarily ground the ground circuit of injector (the ground wire goes straight into the computer for internal grounding), causing the injector to pulse. If you have no pulsing, determine if it is the drive circuit (no power to injectors), or the ground circuit that has failed.

Jul 09, 2012 | Cars & Trucks

1 Answer

My car lights pulse


check the ground wire connection at the raid support and the ground cable from the battery to the body

Jun 20, 2012 | 2003 Ford Focus

1 Answer

NO PULSE TO INJECTORS-FUSES ARE GOOD,REPLACED CAM SENSOR


If one injector is shorted out. it may shut down the injector drive circuit.
The pulse to injectors is a little incorrect: Low voltage power (because of a resistor pack inline) is present to injectors at all time with key on. The pulse is caused when the computer grounds the circuit to let the injector fire.
To test: pull off one injector connector. Ground a testlight and turn key on. One of the injectors' wires should have power. If not, take off all inj. connectors and re-test(in case of a shorted injector). If you have power on one wire, the drive circuit is good.
Now test the ground circuit: put the black lead of testlight on the positive post of battery, and probe the wire that did not light up. Have someone crank the car over. When cranking the testlight should be blinking, meaning the engine computer is properly grounding the circuit.
So, if you didn't get a steady light, it's a drive circuit problem. No blinking light means a problem in the computer not grounding the circuit.

Dec 05, 2011 | 2001 Chevrolet Cavalier

1 Answer

I have an 89 corvette it starts when i put starting fluid directly into the throttle body but shuts off quick now it just cranks but wont turn over. the fuel pump is working and filter is not clogged...


Sounds like you have spark but no injector pulse. This can be from the throttle position sensor showing that the throttle is wide open, which shuts off the fuel to clear a flood situation. The easy way to check this is unplug it. If the car starts its the sensor. There are 2 wires on the injector. One is key on battery voltage the other goes to the ecm. You can buy a light called a noid light to plug into the injector plug and it should flash if you have injector pulse. If no pulse check ignition module in the distributor. If not that re-post and we can go from there. Have a nice day and good luck!

Feb 21, 2011 | 1989 Chevrolet Corvette

1 Answer

Once in a while car dies while trying to start


Several things. Take the car to Autozone or Oreillys for a free scan. Before you go, check the starter and starter cables under the car. Have them check starter draw. Have them check the battery and alternator.

It sounds like the alternator is not quite filtering out the electric pulses it creates when working. The starter can ground out but usually not after you are moving.

If the gauges do not indicate anything, do a wiggle test to see if you can find the short.

Nov 01, 2009 | 1995 Ford Mustang

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