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No power to coil asd relay good

Exhaust fell off tearing 02 sensor wires what might be the cause

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  • Cars & Trucks Master
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Check your fuses probably blown a ecm fuses

Posted on Mar 30, 2015

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No power to fuelpump or coil or coil driver so I ran a jumper wire and fuelpump and all started working what is causing no power


The common component to the coil and fuel pump is the ASD relay. The ASD (auto shutdown relay) is activated from the (ECM) engine control module by the ignition key, but in the event of a roll over or crash the ASD relay kills power to the engine and fuel.
26111978-lkayiuev2pawqft0guju1hyb-3-0.gif Above is a typical under hood power distribution. I will usually look for a identical relay and swap it with the ASD relay and see if it corrects the problem. If this is the circuit then the key switch and safety circuits need to be checked.

Feb 28, 2016 | Cars & Trucks

1 Answer

1996 dodge ram 1500 i have fuel but no spark after the coil pack


You have fuel,As long as you can hear the pump come on this is a good sign,the ASD relay works, The ASD relay power the fuel pump the injector the power to the coil,The primary signal for spark is the crank sensor the location is behind passenger side cylinder head its is a three wire connection.This is your solution

Mar 08, 2012 | Dodge Ram 1500 Cars & Trucks

2 Answers

95 dodge intepid es 3.5 no spark changed coil crank and cam sesors. still no spark. help


are you able to have the engine code read? for free at any autozone or advance auto parts store? sounds exactly like you have a bad computer,located on the passenger side at the kick panel where your right foot would be if you're setting in the passenger side seat.!1st i would check your ecm fuse located under the hood in the main fuse box on the driverside fenderwell,all good? then move towards the computer. thank you for choosing fixya.com!

May 02, 2011 | 1995 Dodge Intrepid

3 Answers

I have a 02 grand caravan, there is fuse call asd that keeps on blowing.


Well in a short term, you have a short circuit somewhere. Here is a detailed toturial for you. Please rate this post, thank you.

Automatic Shutdown (ASD) sense - PCM Input

The ASD sense circuit informs the PCM when the ASD relay energizes. A 12 volt signal at this input indicated to the PCM that the ASD has been activated. This input is used only to sense that the ASD relay is energized.
When energized, the ASD relay supplies battery voltage to the fuel injectors, ignition coils, and the heating element in each oxygen sensor. If the PCM does not receive 12 volts from this input after grounding the ASD reley, it sets a Diagnostic Trouble Code (DTC).

Automatic Shutdown Relay - PCM Output

The PCM operates the Automatic Shutdown (ASD) relay and fuel pump relay through one ground path. The PCM operates them by switching the ground path for the solenoid side of the realys on and off. Both realys turn on and off at the same time.
The ASD relay connects battery voltage to the fuel injectors and ignition coil. The fuel pump relay connects battery voltage to the fuel pump.
A buss bar in the power distribution center (PDC) supplies voltage to the solenoid side and contact side of the relay. The ASD relay power circuit contains a 20 amp fuse between the buss bar in the PDC and teh relay. The fuse also protects the power circuit for the fuel pump relay and pump. The fuse is located in teh PDC.
The PCM controls the relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the ignition switch is in the Off position. When the ignition switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and the camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the crankshaft position sensor and camshaft position when the ignition switch is in teh Run position, it will de-energize teh ASD relay.
The ASD relay and fuel pump relay are located in the PDC near the battery. The inside top of the PCD cover has a label showing relay and fuse location.

ASD and Fuel Pump Relays

The following description of operation and tests apply only to the Automatic Shutdown (ASD) and fuel pump relays. The terminals on the bottom of each relay are numbered.

'------------------'
' __85 ___________'
' __87A '87 '30 ___' Sorry for the crudeness of this. This is supposed to
' __86 ___________' be the relay terminals!
'------------------'

OPERATION
- Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all times.
- The PCM grounds the coil side of the relay through terminal number 85.
- Terminal number 86 supplies voltage to the coil side of the relay.
- When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.
- When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies voltage to the rest of the curcuit.

TESTING
The following procedure applies to the ASD and fuel pump relays.
(1) Remove relay from connector before testing.
(2) With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance shoud be 75±5 ohms.
(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.
(4) Connect the ohmmeter between between terminals 87 and 30. The ohmmeter should not show continuity at this time.
(5) Connect one end of a jumper wire (16 guage or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12 volt power source.
(6) Connect on end of another jumper wire (16 guage or smaller) to the power side of the 12 volt power source. Do not attach the other end of the jumper wire to the relay at this time.

WARNING: DO NOT ALLOW OHMMETER TO CONTACT TERMINALS 85 OR 86 DURING THIS TEST.

(7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.
(8) Disconnect jumper wires.
(9) Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, is operates properly. Check the remainder of the ASD and fuel pump curcuits.

__________________________________________________ _______________

I know you said you replaced the relay, and this is a test procedure for the relay, but I have bought bad parts in the past. The description before the test procedure at least gives you an idea of what components are wired through and controlled by the relay. One of those may be faulty. Email me if you want or need wiring diagrams and I should be able to scan them and email them to you.

I hope this helps.

Please rate this post, thank you

Apr 07, 2011 | Dodge Grand Caravan Cars & Trucks

3 Answers

No current to the coil


check all fuses and relays and the cowl pack give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your Jeep wish you the best of luck Michigan Man.

Mar 08, 2010 | 1996 Jeep Cherokee Country

1 Answer

Car won't start. There is no spark at the plugs. I replaced the Camshaft Sensor and Crankcase sensor. Checked to see if there was 8 volts going to these components and nothing. Checked the power going into...


check your fuses if they are all good ,check all the ground wires on the engine make sure they are all making good connections,and if still not starting then its a very good chance that your PCM (computer) is bad. you can buy a used one for little money at a salvage yard.

Jan 29, 2010 | Chrysler Concorde Cars & Trucks

1 Answer

Engine won't start


Sounds like an AUTOMATIC SHUTDOWN (ASD) RELAY problem. Fairly common on the Caravan.
Heres a brief overview of the ASD.
The Powertrain Control Module (PCM) operates the Auto Shutdown (ASD) relay by switching the ground path on and off.
The ASD relay supplies battery voltage to the fuel injectors, electronic ignition coil and the heating elements in the oxygen sensors.
The PCM controls the relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the ignition switch is in the Off position unless the 02 Heater Monitor test is being run. Refer to On-Board Diagnostics. When the ignition switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the crankshaft position sensor and camshaft position sensor signals when the ignition switch is in the Run position, it will de-energize the ASD relay.
The ASD relay is located in the Power Distribution Center (PDC). The PDC is located on the driver's side inner fender well Power Distribution Center . A label on the underside of the PDC cover identifies the relays and fuses in the PDC
Check for good ground.
Good luck...i hope this helps, please rate me a fixya.

Jun 25, 2009 | 1994 Dodge Caravan

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