Off the top of my head - I think both the CKP (crankshaft) sensor and
the CMP (camshaft) sensor signals are required to be valid (from the
PCM's perspective) before the PCm will energise the ASD (auto shutdown)
relay which powers both the injectors as well as the coil. Sounds like
one of yours is bad (or wiring). There is a troubleshooting procedure
for both of these in the FSM that involve only a volt/ohm meter. The
procedure should be similiar regardless which vehicle (Ram, Van, Dakota,
3.9L, 5.2L, 5.9L, 93-present). Good Luck.
Shane
Ron wrote:
>Upon your advice, I switched the A/C relay with the ASD relay (yes they are
>all the same number) and tried it. Nothing happened (i.e. still didn't
>start). Then I switched the ASD and the relay under the A/C relay (I forget
>which one but not the fuel pump one). Still nothing. I checked for voltage
>at the relay sockets and there was voltage. Different pins were hot
>depending on which relay. I thought that was odd, but maybe not).
>
>Thanks,
>-Ron
>
>----- Original Message -----
>From: "Patrick and Kelly Engram" <patrickandkelly@erols.com>
>To: "DML" <dml@dakota-truck.net>
>Sent: Sunday, July 06, 2003 10:12 PM
>Subject: DML: Dead Dakota
>
>
>
>
>>I was thinking about your coil not getting power and wished I had a
>>wiring diagram. I know that there is an ASD relay that will kill power
>>to the ignition system when it goes bad. This relay is in a box under
>>the hood, and it normally is the same relay used on other accessories,
>>such as an a/c relay. Find the ASD relay and switch it with another
>>relay for a system that will not be in use (hint-dont switch it with the
>>fuel pump relay!) I am used to seeing constant battery power on the
>>positive side of the coil with the ignition turned on, and the negative
>>side gets power across the coil when you crank the engine. However, the
>>computer may shut down power to the coil depending on other inputs it's
>>seeing also. The coil + is connected to the injectors and the ASD power
>>supply from the computer, so my best guess right now is possible bad ASD
>>relay.
>> Patrick
>>
>>
>>
>
>
>
>
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