Question about 1998 Dodge Dakota

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My 98 dakota wont fire

I have changed my fuel pump, checked all fuses and my is fluel line is clean ,checked my relay and it still wont fire ,it wants to but still wont it gets a sprk but wont start

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  • Dodge Master
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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.
The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running, the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module.  This causes the engine to shut down.

The logic module monitors the relay driver.  If it senses that the relay driver is not responding correctly it will trigger a code. If the logic module does not sense an absence of current when the circuit is open, or 12 volts DC when the circuit is closed, it knows that the circuit is open or shorted, and triggers code 42. Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start. Good luck and hope this helps lead you in the right direction. Hint: The ASD can be triggered by a broken wire or short in another place, e.g. the fuel pump. 

Posted on Jul 04, 2009

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