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Ron
Ron, ASE Certified Technician
Category: Dodge
Satisfied Customers: 33794
Experience:  ASE Certs
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No ground at asd relay, 180000 started fine died driving

Customer Question

no ground at asd relay
JA: How many miles are on the car? Has the car been starting normally?
Customer: 180000 started fine died driving down road
JA: What is the model/year of your Dodge?
Customer: 1995 ram 1500
JA: Are you fixing your Ram 1500 yourself? What have you tried so far?
Customer: yes I am fuel pump fuse relay and asd relay if I manually ground asd relay have voltage to fuel pump
JA: Anything else you want the mechanic to know before I connect you?
Customer: ground was melted at brake booster
Submitted: 2 months ago.
Category: Dodge
Expert:  Ron replied 2 months ago.

Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

Expert:  Ron replied 2 months ago.

Your ASD relay gets its ground from the PCM (computer) are you sure that when the wire was melted that it did not take out the PCM?

Customer: replied 2 months ago.
The ground wire that was melted went to the chassis wiring in harness have a feeling it is either o2 sensor or transmission solinoids am gonna check pin 51 and 57 on ecm
Expert:  Ron replied 2 months ago.

Okay then I would also check power and ground to the PCM and ohm the ASD wire from the PCM to the relay. See the steps to do this in the link below.

https://dl.dropboxusercontent.com/u/104923897/PCM%20power%20and%20ground%20Oct%2025.pdf

See the System wiring diagram in this link for testing reference .

https://dl.dropboxusercontent.com/u/104923897/ASD%20wiring%20Oct%2025.pdf

Customer: replied 2 months ago.
Pin 57 has no power when ign switch is on pin 51if I probe with a test light you can hear relay click pins 3 9 11 and 12 all do what they are supposed to
Expert:  Ron replied 2 months ago.

All your doing when you probe it is adding a ground . Have you check your power and ground to the PCM?

Customer: replied 2 months ago.
power is at pin 3 and 9 and ground is at 11 and 12 they checked out good
Expert:  Ron replied 2 months ago.

It sure sound to me like you PCM has failed if you have power to the ASD relay.

Customer: replied 2 months ago.
I agree
Expert:  Ron replied 2 months ago.

T he ASD supplies battery voltage to the fuel pump, fuel injector, ignition coil, generator field winding and oxygen (O2S) sensor heating element. The ground circuit for the coil in the ASD relay is controlled by the powertrain control module (PCM) The PCM operates the relay by switching the ground circuit on and off. Im thinking if the HO2S circuit was shoted out it caused the PCM to short out as well.

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