Question about 1998 Dodge Dakota

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I need help with my 98 dakota that wont start. It has a 3.9 ltr in it. I have fuel pressure and it turns over but I have no power at the coil or at the injectors. I cant seem to find out where the issue is. If i patch wire to the ignition coil it still wont fire cause I get no ground from the pcm. Mitchell only shows one power wire at the pcm and it has 12volts. I really dont know what else to look at. Does anyone have any ideas.

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  • Ed Woods
    Ed Woods May 28, 2010

    So any idea how to test the hall effect or the crank sensor? thanks

  • Ed Woods
    Ed Woods May 28, 2010

    got some more strange things going on. The milage display falshes on and off and the scanner wont communicate. Also noticed that I have intermittent ground to the evap solenoid on the top of the motor So that clicks on and off constantly. I assume its some kind of short some where but not sure where. Battery is new and charged up so what should I be looking for?

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2 Answers

If yours is similar to my 92 shop manual (I have a 92-5.2 V8)

The 3.9&5.2 use a ASL-Auto Shutdown Relay,you will find, in my case under the hood on the driver side fender. If the computer, we'll call it,doesn't see the Crank Position Sensor (used for spark) or the Hall Effect Sensor,in the distributor,(used for injector timing), it takes the ground off it. Then you got what you have.
Once running,the map sensor and coolant temp sensor,play additional rolls in fuel stratagy.

Posted on May 28, 2010

  • Anonymous May 28, 2010

    In your case the crank sensor is new. Remember the CPS is a magnetic output sensor or generator. If the computer didn't see it or the Hall Effect Sensor ,it would drop the ASD Relay ground,and you would done. Your not getting voltage to the coil,until the computer gets what it needs,then it will suppy the 12 v

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  • 145 Answers

Maybe the crank sensor?

Posted on May 28, 2010

  • Ed Woods
    Ed Woods May 28, 2010

    Crank sensor was replaced just a few weeks ago. Would the crank sensor even keep power from being supplied to the coil or injectors. I am stumped so far.

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Have you checked base fuel pressure with a gauge ?
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If you have no fuel pressure at the engine when key is on, the pump is not coming on. Check fuel pump fuse, check fuel pump relay (relay should click when key turned to on-put finger lightly on it and feel for click when someone turns key to on). If no click, signal from computer may be lost, ground for relay may be lost, or relay may be bad. If it clicks, wiring from relay to pump may have failed, or the relay's main power source may not be there at relay-find the fuse link or maxi-fuse that powers that relay. One terminal at relay should be hot at all times-can check for that with a test light.
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Aug 29, 2009 | 1999 Dodge Dakota

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My 98 dakota wont fire


Check your Automatic Shutdown Relay in your fuse and relay box under the hood by the battery. The power supplied to the fuel pump, ignition coil, fuel injectors,  and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD); the idea is to shut off fuel pressure and the ignition systems when the key is turned off to prevent fires, dieseling, and other problems.
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1 Answer

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