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Unread 11-06-2007, 03:53 PM   #1
whitejeep96zj
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ASD relay...what triggers it.

So my jeep has just started to die randomly all of the sudden. I thought it was fuel so i gauged it and it stays at 48 psi all the time. I have used voltmeters on all the sensors and they are all in the right range. So i was wondering what triggers the asd relay to kill the car because i was told when i got it that the security system has triggered it a couple of times even though the car was unlocked using the key. Thanks.

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Unread 11-06-2007, 04:16 PM   #2
greasefingers
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Sounds to me the security system may be suspect?

The computer (ecu or pcm) triggers the relays by grounding them

Electrical trouble-shooting can be a biotch. I have spent several cold winter nights on my back under cars with flood lights and propane heaters. Hint: you need a stock of hot chocolate and a warm women waiting inside your house!

If you test the circuit for battery with the key in the On/Run position; then you only have about 3 seconds before the PCM times out. This is because the PCM needs a Cam & Crank shaft signal. If it does not see these then it de-energizes the ADS relay (automatic shutdown relay). The ADS relays powers the fuel pump relay. The relays will make a clunk when energized. However this is not true when power is removed from them! They have a soft return. I place a finger on each the two relays when I want to see if power is getting to them. That way you are fooled by other neighbouring relays in there.
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Unread 11-06-2007, 06:32 PM   #3
whitejeep96zj
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Quote:
Originally Posted by greasefingers
Sounds to me the security system may be suspect?

The computer (ecu or pcm) triggers the relays by grounding them

Electrical trouble-shooting can be a biotch. I have spent several cold winter nights on my back under cars with flood lights and propane heaters. Hint: you need a stock of hot chocolate and a warm women waiting inside your house!

If you test the circuit for battery with the key in the On/Run position; then you only have about 3 seconds before the PCM times out. This is because the PCM needs a Cam & Crank shaft signal. If it does not see these then it de-energizes the ADS relay (automatic shutdown relay). The ADS relays powers the fuel pump relay. The relays will make a clunk when energized. However this is not true when power is removed from them! They have a soft return. I place a finger on each the two relays when I want to see if power is getting to them. That way you are fooled by other neighbouring relays in there.
well what would happen if i put a jumper in the place of the relay? Would that cause any harm to any of the other electrical systems? im not sure if its that relay or not cause the car will drop to 0 rpms for like half and second and then bring it back to life on its own. I have spent all day looking for a suspicious sensor and im about to call it quits.
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Unread 11-09-2007, 10:20 AM   #4
greasefingers
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If you suspect it is a relay then swap it out with one of the same type. Most of the relays in the relay center are all the same so choice one like from the A/C or fog lights (something you can live without, but just for trouble-shooting) The relays are $ 9 at the dealership
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 11-09-2007, 10:33 AM   #5
t_guenther
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I disabled my security system, seemed to have fixed a few problems, including vehicle shutdown, and walking into a store only to have to walk all the way back to my truck to stop the horn from honking. Not a good system at all, if you need a system, buy a viper or something reliable.
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Unread 11-25-2007, 05:27 PM   #6
wkobe88822
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so how did you disable the security system? and one more question is the oil level light and idiot light or is it a system shut down light because i have changed the motor and the replacement motor has no where to plug the oil level sensor in

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Unread 11-25-2007, 05:33 PM   #7
t_guenther
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Well, if you take your door panel off and find the wires going to the sensor in the door, there will be one that is purple with a yellow stripe. Cut it and ground the wire, i can't remember off and what side of the wire you need to ground, but just do a search like security system disable or something like that and you will get quite a few threads that explain how to do it. I have no idea about the oil thing.
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--95 Grand Cherokee 5.2L V8--
Front/Rear Adj. Track Bar, 249 to 231 Swap, Tie rod conversion,
Hella 500's, Flowmaster 50 Series, Aussie Locker in the Rear,
31x10.5 BFG All-Terrains on 15x8 Pro Comp 97 Crawlers, 3" Lift
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Unread 04-07-2013, 05:06 PM   #8
nleana77
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i have similar issue...
just got a 95 jeep grand cheerokee, nothing even starts...inside car lights are just on...
bought new battery bcus it made a clicking noise...but now engine turns over but doesnt crank or start so to say..
a/c comes on but not the radio..headlights nor signals dont even work..can't lock the doors...wth do i do?
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