Question about Cars & Trucks
In the fuse box under the hood. Take the lid off and flip it over. You should see a diagram of what relay does what. Some vehicles will have numbers only in which case you will need the owners manual that came with the car.
Posted on May 13, 2017
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Posted on Jan 02, 2017
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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, or if the turbo
boost pressure reaches and exceeds the over boost cut-off point, 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.
Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start.
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