Question about 1994 Dodge Ram

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94 ram computer ground

There is no ground through the run circuit and no power to fuel pump, injectors, or coil; I get power through the fuel pump relay when it is engaged.

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  • 13 Answers

Disconnect battery over night this should clear comp. problems. if the problem is still there and engine lite is on go to auto zone, they will check it for you . I think you find out you need a pump good luck

Posted on Mar 22, 2014

6 Suggested Answers

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Posted on Jan 02, 2017

  • 1114 Answers

SOURCE: 94 dakota 5.2 - no spark - auto shut down relay not energized

Hello this is a feature to stop the engine and exhaust system from filling up with gas when spark is lost! years ago fuel would be delivered as usual and you Eng and converter would be full of gas real hazard back then!!!!now they built into computer when spark fails fuel automatically shuts off safety feature??? or not? so i would start to test coil this is a good place to start and if you have engine light on plug in OBD 2 scan tool to retreve the fault hope this helps you out and if you do not have a proper spark tester tool i would invest in one most auto parts stores usually carry them!!! $15-$30 dollars usually.John

Posted on Feb 15, 2009

  • 14 Answers

SOURCE: My 1998 dodge ram 2500 will not start. I believe

pound on gas tank an see if it runs if so replace fuel pump

Posted on Mar 06, 2009

  • 218 Answers

SOURCE: 94 dodge ram 1500 5.2 replaced fuel pump still no

U NEED TO CHECK THE FUEL PUMP AND AURO SHUT DOWN RELAY.THEY ARE IN THE UNDERHOOD FUES & RELAY CENTER.U CAN SWITCH THEM 1 AT A TIME WITH A/C RELAY.IF THAT DOES NOT WORK U MAY HAVE A PROBLEM WITH THE PCM

Posted on May 13, 2009

fingaz22
  • 1068 Answers

SOURCE: Where is Fuel Relay for 2004 Dodge Ram 3500 Diesel Truck

it doesn't have a fuel pump relay it has a fuel pump control unit and it is located on the chassis back quarter drivers side near the tube cross member for chassis on top of chassis rail near bed mount. locate the rear springs front perch and it will be above that on top of rail.

hope this helps. good luck and please ask any question you have.

Posted on Oct 25, 2009

Testimonial: "Thanx for info..no wonder I couldn't find Relay! "

  • 3 Answers

SOURCE: 2003 dodge caravan won't start

My 2003 dodge caravan would not start after driving about 1/2 hour. I stopped for coffee and when got back in to start it started I switched gears and it stalled. I tried to start again switched gears then it started but only for 2 sec. No clicking, no cranking sound just would not start but battery functions were great. Spent 2 days with a mechanic who could not resolve so sent to Dodge. After a day of putting wires back and checking out the problem they said it was the computer. Said that it was bad and could be replaced at no charge due to malfunction. Yes, it worked fine afterwards no more problems. They also said that some of the computers are found to be defective like this one so I hope this helps you in the right choice to have the dealer check it out if you are unable to get a computer reading and there is no obvious short in the system. Free sounded very good but as you know there is no such thing as really free as they got me for other things $350 worth. ouch!

Posted on Jul 24, 2010

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2 Answers

2002 dodge ram 1500 4x4 4.7l Turns over but won't start put gas in the throttle body an it will start but shut right off getting gas to fuel rail An power to the injectors


It doesnt sound like you have sufficient fuel pressure can you hear the pump run? if so might be a pressure issue, if not probably pump

Apr 11, 2015 | Dodge Ram 1500 Cars & Trucks

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94 Opel kadett 1.6 single injector. Petrol does not seem to get thru for car to start.petrol pump is ok.where could the problem be.


Check the injector circuit. Here's how injectors usually work: when key is on, they have live power available to them. Key on, the circuit is turned on, so power passes through a fuse to the injector on the power wire. (Check the fuse- it's under the hood, most likely.)
To make the injector "pulse" or spray fuel out, the engine computer will internally ground the circuit for a split second. The injector has a power wire to it from that fuse. Then the ground wire at the injector goes into the computer.

If you have a test light, you can test the circuit. First, clip a test light ground lead to negative battery post. With key on, and the injector connector unplugged, check for battery voltage on the power wire. One of the wires should have voltage and will light up the test light. Now, move your test light lead to the battery POSITIVE post. Have a helper be cranking the engine over while you probe the ground wire-the one that did not light up the test light. If the injector circuit ground is good, the test light will now be blinking. (You are putting voltage into the ground wire to the computer, to check if it is properly grounding the circuit. Every time the light blinks, the computer has grounded the circuit.)
If the circuit passes both tests (key on, steady test light on power wire; engine cranking, blinking light on ground wire), then the injector circuit is good. The injector should be pulsing when it is connected and the engine is cranking. If no gas is coming out of the injector, could be that fuel is blocked somewhere (filter?) from reaching the injector, or it could be a shorted injector. Someone with a volt-ohm meter should check the resistance across the injector terminals and compare with manufacturers' specifications. This will determine if the injector is bad.

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2 Answers

1988 Chevrolet k1500 350 v8 not getting signal to fuel injectors


So, it's the injector circuit. There is a 10 amp injector fuse in the fuse block, on left side, 4th one down. Check this fuse. It supplies constant power to both injectors, on the red wire to injector 1, and a white wire splice from this to injector 2. A steady 12 volts anytime key is in on, run, or start. You can check this with a test light or voltmeter. Ground the test light and probe injector connector's red wire on injector 1, and the white wire on injector 2-both should be hot with key on.
This may be why the noid light didn't blink. The noid light must have this steady power signal, and when the computer internally grounds the injector ground circuit for a split second, you get injector pulse-or a blinking noid light.
You can check the ground circuit separately with a test light also for each injector. Place the ground clip of test light on the POSITIVE battery post, and probe the blue (ground) wire on injector 1, the engine must be cranking over, and the test light should be blinking. Do the same for the green wire on injector 2. If the test light is blinking on both ground wires, with engine cranking-the ground circuit is good. You are sending power down the ground wire to computer, and when the computer grounds the circuit, the tester will light up-it will blink because the computer only momentarily grounds the circuit to cause pulsing of the injectors.

Feb 18, 2014 | 1988 Chevrolet K1500

1 Answer

Fuel injectors not spray


Are you sure it's not the fuel pump? I would be checking fuel pressure-the injectors need fuel under high pressure against them so they will spray out when pulsed.
What year is your Isuzu, and what size engine? Multiport injection has a higher pressure requirement than throttle body injection.
There should be a fuse for the injectors, check that. With key on, not start, the injectors would have power to them on the "injector drive circuit". In other words, constant power is supplied to the injectors when the key is on. The other wire at an injector is the ground wire. The ground wire goes into the engine computer. When the computer internally grounds the injector wire for a split second, the injector is energized and fuel is able to spray out.
Post back if you need help checking the injector circuit-both the power side and the ground side. You can check both with a test light.

Well, here it is anyway: ground a test light and probe the injector connector. With key on, one terminal should be hot-the drive circuit. Now move the test light lead to the POSITIVE battery post, and stick the test light probe into the injector terminal that did not light the test light-the ground terminal. Now have someone crank the engine over. If ground circuit is working, the test light should be blinking-meaning the computer is properly grounding the injector circuit. If both tests are good-a steady light on the power side (key on) and a blinking light on the ground side (engine cranking), the injector circuit is good.

Jan 28, 2014 | Isuzu Cars & Trucks

1 Answer

Weres the ground for injector circuit in 1996 2.4 quad 4


For fuel injection, usually the ground is inside the engine computer. The computer grounds the circuit for a split second to pulse the injectors. When key is on, the injector circuit has constant power to the injectors. When the computer grounds the circuit internally, the injector coil is energized, or pulsed.

Aug 01, 2013 | 1996 Chevrolet Cavalier

1 Answer

I replaced the turn signal switch and now it wont start. i can hear the fuel pump kick on. makes no sense


You said you hear the pump come on, then said fuel pump not running ???
Check the fuse for the pump, preferably with a test light to verify power is there. Key must be in on position. If the fuse is powered, feel for the fuel pump relay to click when you turn key to on. Put your finger on it while someone turns key to on. If it clicks, check for power at the tank connector on the pump wire, while the engine is cranked. If power there when cranking, the pump must have failed and needs replacing. If the relay clicked with key on, and no power at the pump wire at tank while cranking, then check wiring from relay to pump connector-the fuel wire may have broken.
If the relay doesn't click when key turned on, check for the power feed for the pump at the relay terminal. If the relay has power available to be transmitted to pump, then the relay's signal from the computer or the ground side of the relay's coil signal (from the computer) may need checked.
If the pump is working, and you have good pressure in the lines, check the injector circuit. Also a fused circuit, so check the fuse first. The injector should have a steady voltage signal to it with key on. The injector only has two wires, the power wire and the ground wire which goes to the computer. When the computer momentarily grounds the injector circuit, the injector "pulses", causing fuel to spray out the bottom.

Apr 15, 2013 | 1988 Ford F 150

2 Answers

88 chevy 350 with no fuel pump and no injector pulse


The fuel pump circuit and injector circuits are fed by two different fuses.
The fuel pump relay and injectors are controlled by the computer. Have you checked both ECM fuses for power ?

Apr 10, 2013 | 1988 Chevrolet K1500

2 Answers

I am not getting gas or spark


The fuel pump and coil are on two different circuits.
The fuel pump is on the 20amp ECM fuse and the coil, ignition module, and injectors are on a 20amp fuse #10. But the ECM fuse could keep the coil and injectors from working.
You would need to test the fuses in the box in the engine compartment, and the fuel pump relay and coil for voltage and ground. The pump relay is grounded by the computer for 3 seconds when the engine is cranked.

Sep 16, 2012 | 1996 Chevrolet Blazer

1 Answer

My 94 ford explorer 4.0 cranks but wont start. i have 38lbs of fuel at rail port and spark at wire. it also runs on etherfor a hot second. what else can i try?


Check your injector circuit. It will also let you know if the PCM is allowing the injectors to energize. Here's how:
Pull off one injector connector. Turn key to on. Use a test light and clip the black lead of tester to ground, Use the tester's probe to probe both wires in the injector connector. One of the wires should have power and light the testlight, meaning the injector power circuit is working. Now for the injector ground circuit.
Move the black lead of testlight to the battery positive post. Now probe the wire in the connector that did not light up. Have someone crank the car over. When cranking the test light SHOULD be blinking, meaning the PCM is properly grounding the injectors to work. If both wires passed the test, your injector circuit is good.
If it's not working,either the power circuit from ignition switch to injectors is out (no steady light), or the ground circuit from injectors to PCM is not working (no blinking light).
Good luck, post back with results for further assistance.

Nov 29, 2011 | 1994 Ford Explorer Limited

1 Answer

I have an 89 chevy c1500, 5.7, 2wd. Had it running and trying to get it timed. During this process i noticed the injectors quit giving gas. I put gas in it and nothing changed so i have been chasing the...


the reason the injectors stopped is because the motor is not running.this is a safety precaution built into the computer so the engine won`t flood.if the fuel pump is not working then you will have to check powers and grounds at the fuel pump connector by the gas tank to see if the unit is getting fed power and ground.someone will have to try to start the car while you check this out as there is a 2 second prime circuit if the car is not turning over.also this system uses the distributor to know that the engine is turning over to start.you may have a bad pickup coil in the distributor.this system also grounds the injectors through the ecm so you should have power to the injectors when the ignition is turned on,for your information.

Apr 08, 2011 | 1990 Chevrolet K2500

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