Question about 1993 Jeep Grand Cherokee

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Need help finding out whats wrong

No fuel pum relay power no injector pulse and no fire at coil

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Your computer is shot!!!! same thing did my cherokee in drove me crazy

Posted on May 26, 2009

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Replace the battery

Posted on May 26, 2009


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2007 f150 has no fire to fuel pum
Click on the link for some of the wiring. I don't know what testing you have done. Engine cranking, you have spark at the plugs and fuel injector pulse? Are there any applicable trouble codes? To check codes yourself, at the least, you need an obd2 code reader that will check manufacturer specific codes as well as po codes.
In the diagram, fuse 9--20 amp is hot all the time, for load side of relay, terminal 30. If you unplug relay and use jumper wire between terminal 30 and terminal 87, does the fuel pump run? There is also an inertia switch.
You have a fuel pump driver module, I can't rule out a problem in that area?

Apr 03, 2017 | 2007 Ford F-150

1 Answer

2005 Dodge Neon Has no fri at plugs,no pulse at injectors and starter will not turn with key.

what about your security system? Is the security lamp on the dash on of flashing? If it is your security system, I doubt I can help you from here? Any applicable trouble codes?

Battery has a full charge? Sometimes the battery gets run down from testing?

The asd relay supplies primary voltage to fuel injectors--coil pack and other, engine cranking. The computer usually has to see both the cam and crank sensor signals or it won't ground the asd relay. I can only make suggestions on what to check.

Mar 05, 2015 | 2005 Dodge Neon SXT

1 Answer

No injector pulse 4 cyl 93 f250 460

if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.

when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

1 Answer

1999 lincon town car no power to fuel injector

Sometimes a crankshaft sensor does not send the signal to fire either the spark or the fuel injectors. If the fuel pump relay is not getting power, the inertia sensor will not have power either. The inertia reset is just magnetic and does not depend on having power to reset.

You can check for current at the Inertia sensor and at the fuel pump relay. You can also have fuel pressure at the test port without the injectors working, which is the easiest test of all,

You need the sequential firing pulse for the injectors. Have you checked the EEC Relay?

Apr 20, 2014 | 1999 Lincoln Town Car

1 Answer

My car wont start, why

If it cranks normally, it is obviously not the starter relay; if it were the relay the starter would not operate. To begin with, when the vehicle is not starting you are going to have to determine whether it is losing spark, fuel pressure, fuel injector pulse, or some combination of these things.

You can check for spark by removing the coil assembly, plugging 4 known good spark plugs into the plug connectors and laying the plugs agaiinst the metal engine. Then have someone crank the engine over while you watch under the hood to see if the plug is firing.

To check for fuel pressure, you will need a fuel pressure gauge, connecting the fuel pressure gauge to the fuel rail test port, you can measure the pressure in the fuel system when the problem is occurring.

To check for injector pulse, you will need a logic probe or a noid light to check for injector signal (fuel pulse) at the injector electrical connector.

In order to begin diagnosis, you need to check these three things to determine what system the fault is in. Once this is determined, pinpoint testing down to the component level can be performed.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Nov 15, 2011 | 2001 Pontiac Grand Am SE

2 Answers

Turns over but wont start i got fire and fuel to the fuel rail but the injecters are not delivering fuel any ideas whats wronge

sounds like u got no injector pulse comin from ecm.we need to pull ecm codes an review them ,possible camshaft sensors faulty they usually provide reference pulses to ecm for injector firing or pulse.without this pulse ur injectors will never open up to let fuel enter combustion chamber. one way of checking pulse is to connect a noid light(small light bulb that plugs in injector pigtail to chek for power to injector and ur pulsing ground coming from ecm to injector) an test for a blinking light while cranking engine.

Apr 08, 2011 | 1998 Ford F150 Regular Cab

1 Answer

Coil is not firing

This going to likely result in replacing the crank position sensor. This sends a signal to the vehicle computer to tell it when to fire/pulse the coil and injectors. I suspect if you remove one of the injector plugs and insert a circuit tester on the positive side(DO NOT USE A TEST LIGHT using a light "bulb" of any sort, they take too much power and can fry the computer)(the circuit testers use LEDs) that you will not find it pulsing while being cranked. Let me know what you find.

May 31, 2010 | 1997 Kia Sportage

1 Answer

I have a 1988 toyota pickup with the 22re motor it has plenty of spark,and turns over but wont fire i also replaced the fuel pump and still nothing what else could it be?

Check all the fuses,and check the fuel pump relay,if this checks out o k,See if there is fuel pressure at the fuel injectors,if there is,then the injectors are not pulsing.The cause of this is the pick up coil in the distributor,but replace the distributor as a whole,this has all the components in the distributor,That control the fire,and the pulse to the injectors,A used one might be more economical sound money wise.

Jan 20, 2010 | 1988 Toyota Pickup

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