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post #1 of 25 (permalink) Old 07-23-2012, 08:58 PM Thread Starter
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ASD relay issues?

Hey all Im having some no start issues with my intrep, a lil background info.
after reading the info on here i decided to do some preventative maintenance and had my buddy change out the primary timing chain, tensioner, guides and water pump its an 02 2.7 with 122k.
Anyway got the car back together and now wont fire up. After doing some searching on here we tore the cam covers off and verified the timing is ON guaranteed. Heard about the crank sensor causing a no start condition and bought a new one from autozone then saw on here how that "new" sensor might be faulty already. Put back in the original and still no start.
So I searched on hear and checked to see if there was 12 volts at the coil and only had .2 volts with key on, where should i look next? Is the ASD relay i hear about something that can go bad or is it bad wiring someplace? how do i check if i got proper volts at the crank sensor? Any ideas would be appreciated
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post #2 of 25 (permalink) Old 07-24-2012, 07:48 AM
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You checked the fuses (N, S, and W)?

49 times out of 50, the ASD relay is the first suspect, and 49 times out of 50, it's not the problem.
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post #3 of 25 (permalink) Old 07-24-2012, 02:10 PM Thread Starter
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checked all the fuses in the Power Distribution Box underhood all looked good, went back and double checked the N S & W fuses u pointed out and still looked good.
Is the ASD an actual brainbox like the PCM or is it the relay itself in the Power Distribution Box? Also when u say with key ON u get 12v do u mean in the RUN position cause isnt it ON then RUN then START right? Any help is very much appreciated
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post #4 of 25 (permalink) Old 07-24-2012, 02:42 PM
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remove the relay and jumper where the 2 terminals 87 and 30 go in . if everything is fine, then it's the relay. if not, then its a different problem.
(the 2 terminals across from each other at 90 degrees to each other read the bottom of the relay for #'s .that is the circuit the relay controls.)
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post #5 of 25 (permalink) Old 07-24-2012, 09:00 PM
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ASD relay is the relay. Its coil is controlled by an output of the PCM.

I do believe that it came out in a recent discussion that the PCM shuts the ASD relay off in the run position until it detects that the engine is actually running. Just like the fuel pump is turned on for a second or 2 when you first go to Run, it only keeps the ASD relay energized for that same time period. So getting no voltage to the coils may be normal under the conditions you're checking.

And when you say you get 0.2 volts at the coil, you mean from the common wire of the coils to chassis/engine ground, right? The coils work by having +12 volts on the one wire, and the other wire getting pulled to ground by the PCM.

You really should download the FSM and look at the schematics to try to troubleshoot this.


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Last edited by peva; 07-25-2012 at 05:51 PM. Reason: spelling correction
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post #6 of 25 (permalink) Old 07-25-2012, 12:45 PM Thread Starter
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Quote:
Originally Posted by peva View Post

I do believe that it came out in a recent discussion that the PCM shuts the ASD relay off in the run position until it detects that the engine is actually running. Just like the fuel pump is turned on for a second or 2 when you first go to Run, it only keeps the ASD relay energized for that same time period. So getting no voltage to the coils may be normal under the conditions you're checking.

And when you say you get 0.2 volts at the coil, you mean from the common wire of the coils to chassis/engine ground, right? The coils work by having +12 volts on the one wire, and the other wire getting pulled to ground by the PCM.
Yes i am checking at the chassis side of the coil wires the dark green/light green wire i believe, and i tried having the key toggled from ON to RUN to see about my voltage and it surged for 2 seconds like u said when i heard the fuel pump prime but only to .3 nothing high no volts with key in ON.
Where can i find the FSM to download and where would you suggest i start looking?
Thanks for all the great advice so far guys!
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post #7 of 25 (permalink) Old 07-25-2012, 01:30 PM
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Originally Posted by 02_intrep View Post
Where can i find the FSM to download and where would you suggest i start looking?
FSM can be downloaded here:


2nd Gen FSM Factory Service Manual and 42LE Transmission service manual
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post #8 of 25 (permalink) Old 07-25-2012, 06:03 PM
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Yes i am checking at the chassis side of the coil wires the dark green/light green wire i believe, and i tried having the key toggled from ON to RUN to see about my voltage and it surged for 2 seconds like u said when i heard the fuel pump prime but only to .3 nothing high no volts with key in ON...
I don't think you are quite understanding. The dark green/light green wire is the solid +12 volts when the ASD relay is energized. You need to measure from that wire to a good ground (like the engine block). If you measured across the coil (i.e., the meter leads on the two coil wires), you will always get close to zero volts whether the ASD relay is energized or not. The coil gets turned on by the other wire (not the dark green/light green wire) getting pulled close to ground by the PCM coil driver output. There will only be voltage across the coil just before a spark is triggered by the coil being turned off, and it would have little effect on a meter - you'd see it with an oscilloscope.


SO - to summarize: To tell if the ASD relay is on, put one meter lead on the dark green/light green wire of the coil and the other lead on a good ground (*not* the other coil wire). If +12 volts, ASD relay is on. If close to ground, ASD relay is off. You will *always* see zero volts or close to zero volts across the two coil wires whether the ASD relay is on or off.

HTH. It should make more sense once you look at the schematics.


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post #9 of 25 (permalink) Old 07-27-2012, 03:49 PM Thread Starter
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SO - to summarize: To tell if the ASD relay is on, put one meter lead on the dark green/light green wire of the coil and the other lead on a good ground (*not* the other coil wire).
My mistake for not specifying, I was checking the voltage at the coil by probing the dark green/light green wire with the positive and grounding to the negative remote post or the engine block.
I think you guys have got me close to the answer, I jumpered the pins 87 and 30 across the ASD. That gave me 11.50 volts at the coil and a whirring sound from the intake? I pulled the key out and still had the whirring sound until i pulled the jumper wire. I pulled the rad fan relay and put it in place of the ASD relay and got my original 0.2 volts.

Do i got a bad wiring issue or a bad sensor in the intake?
Thanks for all the help so far guys really appreciate it.
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post #10 of 25 (permalink) Old 07-27-2012, 04:00 PM
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did it start when 87-30 was jumpered? if yes, then the relay or the circuit controlling it is faulty. that circuit is hot all the time, controlled by the relay. so it will stay on even if the key is off if jumpered.

if it still didn't start, then the issue is not in the asd relay.
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post #11 of 25 (permalink) Old 08-01-2012, 07:03 PM Thread Starter
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did it start when 87-30 was jumpered? if yes, then the relay or the circuit controlling it is faulty. that circuit is hot all the time, controlled by the relay. so it will stay on even if the key is off if jumpered.

if it still didn't start, then the issue is not in the asd relay.
Tried to start it with the jumper in place just cranks not starting.

So I was checking out the wiring going to the coil packs and i noticed on all 3 driver side coils there were breaks in the insulation where the wires were exposed, pulled the intake and found a hard pinch in the wiring going to the passenger bank.
So i go to the local junkyard and pulled a coil/injector harness from an 03 2.7 intrep. and spliced it in.
STILL not starting! checked for voltage at coils and still only getting .22 volts with key ON it will surge to 12 for a second when turned to RUN then back to .22. But with the jumper i get 12.20 volts without even putting in the key.
SO im thinking the ASD isnt to blame but he might know who is guilty maybe??
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post #12 of 25 (permalink) Old 08-01-2012, 09:06 PM
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Unplug your AC pressure transducer and see if that makes a difference.
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post #13 of 25 (permalink) Old 08-02-2012, 09:28 AM Thread Starter
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Unplug your AC pressure transducer and see if that makes a difference.
ok, and where do i find the AC pressure transducer? is that a fancy term for the electric connection on the AC compressor?
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post #14 of 25 (permalink) Old 08-02-2012, 09:33 AM
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Follow the Discharge line that goes from the AC compressor up front to the Condenser in front of the Radiator. The AC Pressure Transducer will be attached to that line.
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post #15 of 25 (permalink) Old 08-02-2012, 11:04 AM Thread Starter
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Follow the Discharge line that goes from the AC compressor up front to the Condenser in front of the Radiator. The AC Pressure Transducer will be attached to that line.
So i disconnected the transducer still no luck starting the car.

Did the key dance got code p0533 turns out as a AC pressure signal code when i searched it, so this means this circuit is working then if disconnecting it popped a trouble code?

What are the chances my PCM got fried somehow it seems im running outta things to check and i dont even want to ask how much itll cost to replace and flash a new pcm
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