Question about 1997 Dodge Grand Caravan

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Car cranks but won't start. Diagnostic code says

Car cranks but won't start. Diagnostic code says auto shutdown relay control circuit.
Have put in new wires, plugs, cap and rotor and coil. The auto relay chekcs out good.
What's causing the auto shutdown relay to keep car from starting?

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I changed all the parts I mentioned and finally I decided to try the crank shaft sensor and if that didn't work I was going to replace the cam shaft sensor. Luckily the crank shaft sensor worked but only after I replaced all the other parts. But at least now it finally started.

Thsank you.

Posted on May 18, 2009

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Wont start2004 dodge grand caravan sxt code p0685 show on dash


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P0688 (generic) = ECM/PCM Power Relay Sense Circuit /Open
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Check all the ECM fuses, if the fuses are OK try replacing the ASD (Auto Shut Down) relay.

Read more: http://www.autocodes.com/p0688_dodge.html#ixzz405J7vpq8

Possible causes:

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Short or open in Auto Shutdown (ASD) relay circuit
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Check all the ECM fuses, if the fuses are OK try replacing the ASD relay.

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The Front Control Module (FCM) has detected the supply voltage below an acceptable value
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Symptoms - Engine Light ON (or Service Engine Soon Warning Light)

Possible causes - ASD relay circuit is open or shorted
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""""""""NOTE"""""""""
"" P0340" This code , cam sensor make the car long start or not start, conditions.

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