ASD Relay Switch

Tiny
BUDDHALUV79
  • MEMBER
  • 1995 DODGE STRATUS
  • 4 CYL
  • AUTOMATIC
  • 200,000 MILES
Where would the ASD Relay Switch be located at? There is a 20 amp ASD fuse in the fuse box, but no actual ASD Relay Switch (which I was told is like a little black box).
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Monday, October 3rd, 2011 AT 4:55 PM

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Tiny
JDL
  • EXPERT
For 2.0, under the hood in power distribution center.
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Monday, October 3rd, 2011 AT 5:06 PM
Tiny
JDL
  • EXPERT
Here is the location. Below.
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Monday, October 3rd, 2011 AT 5:10 PM
Tiny
BUDDHALUV79
  • MEMBER
Do you know if the ASD would have anything to do with the fuel pump not kicking on? The fuel pump is good, but there is no electric at the hook up that you plug it in to.

Thank you so much for your diagrams!
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Monday, October 3rd, 2011 AT 5:15 PM
Tiny
CARADIODOC
  • EXPERT
The fuel pump or pump relay is powered by the ASD relay. The Engine Computer turns that relay on for just one second after turning on the ignition switch, then again during engine rotation, (cranking or running). If you hear the pump run for that first one second but it doesn't run during cranking, suspect the camshaft position sensor first and the crankshaft position sensor next. It's the pulses from those two sensors that tell the computer the engine is rotating.
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Monday, October 3rd, 2011 AT 5:23 PM
Tiny
BUDDHALUV79
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Thank you so much for your help!
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Monday, October 3rd, 2011 AT 6:20 PM
Tiny
BUDDHALUV79
  • MEMBER
My dad says that his buddy that is helping him took out the fuel pump relay switch out of the fuse box and then put a jumper wire into the compartment where the fuel pump relay switch goes into and when he did that there was power back at the electric connector and the pump started working. But then when they put the fuel pump relay switch back in it stopped working. So they thought that fuse was bad, but they switched it with another fuse and it still didn't work. Hope this is making sense. So they did get power when the put a jumper cable into the fuse box (at the Fuel Pump Relay fuse) but not when they put in the fuse.

Any ideas on that?
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Tuesday, October 4th, 2011 AT 5:01 PM
Tiny
CARADIODOC
  • EXPERT
If they jumpered the relay and there was voltage to the pump connector, there's your proof the fuse is okay. No need to go testing something you know is good.

The relay itself could be bad but that's not very common. It could have pitted or burned contacts or the coil could be open. A simple way to identify that is by switching it with another one like it.

Here's what you need to know from my previous reply:

The Engine Computer turns that relay on for just one second after turning on the ignition switch, then again during engine rotation, (cranking or running). If you hear the pump run for that first one second but it doesn't run during cranking, suspect the camshaft position sensor first and the crankshaft position sensor next. It's the pulses from those two sensors that tell the computer the engine is rotating.

To say it another way, after that first second, the fuel pump should not be running until you crank the engine.

Have you checked for spark? If you got hung up on the first thing you found not working, the fuel pump, and didn't look at the other systems, you'll be troubleshooting the wrong circuit.
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Tuesday, October 4th, 2011 AT 7:27 PM
Tiny
BUDDHALUV79
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There is no spark. And the fuel pump does not kick on for even a second. There is no sound or action from the fuel pump whatsoever.
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Wednesday, October 5th, 2011 AT 7:37 PM
Tiny
CARADIODOC
  • EXPERT
Dandy. You don't have a fuel pump problem.

Look for the dark green / orange wire feeding the ignition coil pack, any injector, or either small wire on the back of the alternator. Use a test light to check for voltage there. A digital voltmeter might not respond fast enough to see what you need to see. The test light should light up for just one second when you turn on the ignition switch, then it will go back off. If that doesn't happen, we have to look at the ASD relay circuit.

Once the test light goes off, it should turn back on when you crank the engine. If it does not, we have to look at the camshaft position sensor and crankshaft position sensor circuits.

Have you checked for diagnostic fault codes yet? They will get you into the circuit that needs to be diagnosed.
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Wednesday, October 5th, 2011 AT 10:05 PM

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