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Anyone know if losing power to coil is a relay or sensor posibly...fuses good...ecm? Ignition? I gronded power wire acidently lo st 12 volts ...dead. now key on no voltage

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: on my 1994 plymouth voyager the 3 wire harness to fuel pump (blue wire) doesn't have 12 volts; should it? fuel pump quit then worked once when hot-wired with 12 volts. fuse and relay is good.

The wire should not be hot until the relay is triggered. The relay does not get triggered until the ignition key is turned on. It will run for 3-5 seconds or until the system pressure it at max.

Posted on Apr 27, 2009

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SOURCE: no power, lots of smoke code p1247 neddle lift sensor

JUST A SUGGESTION 4 ELIMINATION ON THESE MODELS THE AIRFLOW METER CAN B APROBLEM A SIMPLE TEST WILL ELLIMINATE THIS DISCONNECT AIRFLOWSENSOR DRIVE UP ROAD IF CAR DRIVES BETTER THEN REPLACE AIRFLOW METER GOOD LUCK

Posted on Oct 09, 2009

  • 1 Answer

SOURCE: my 2003 ford tauruse will not start. I do not

the pin locations are 21 & 22 on the plug.
I am working on a 02 Sable with the same problem,
let me know what you find out on this as I will be doing the same this weekend.

KK
mrkk6724@yahoo.com

Posted on Feb 13, 2010

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SOURCE: 94 Chrysler Town and Country won't start with key.

has it got an immobiliser / if so there is a fault there. If not an ignition switch itself.

Posted on Apr 07, 2010

clifford224
  • 1975 Answers

SOURCE: 1994 nissan pathfinder....no fuel from

Gave you a picture below of part of the wiring diagram to the fuse panel and it has the wire colors as well. I could only give you that much because I can't post any pictures to large (size wise in computer size) so thats the best i could do for right now. It does look as if there may be a fuseable link in 2 places maybe more but i just took a quick look. If you need anymore digrams you can email me at csautomotivecars@att.net with detailed info so I can send you the correct stuff. I doubt it's the ignition switch myself. i think you are looking at a wiring problem and i've only been doing this or 25+ years. Bet your kicking yourself for spending the money on the ECU. Sorry had to throw that in. Anyway i hope this helps you and good luck and feel free to write if needed.


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Posted on Apr 28, 2011

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What color are the wires from the ECM to the coil pack and which one are the driver for coil b


The power scorce isn't the ECM .Test another coil for 12 volts key on run the configuration of the wires in side the connecters will be the same .Then see what is hot in coil B connector if you have the same voltage and tests the same then the coil pack is likely the problem but test the grounds on B and check the main wire OHMS before you start spending money

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You have done well so far, but this is a hard problem. Have you checked the reference voltage (usually 5vdc) that is going to the temp sensor? It might be getting pulled down by one of the other sensors on that wire. A way to check is to get a baseline voltage on the coolant temp sensor black wire. Then unpulg the map sensor--does the voltage on the black wire increase? If yes, replace the map sensor. If not, next unplug the A/C pressure sensor. Same process. Finally, unplug the transmission temp sensor. If unplugging any of these sensors increases the voltage on the black wire by say a volt, replace the bad sensor and retest.

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The ASD relay supplies battery voltage (12+ volts) to the fuel injectors and ignition coil(s). With certain emissions packages it also supplies 12-volts to the oxygen sensor heating elements. The Fuel Pump Relay is a separate relay controlled by the ASD relay input to the PCM. Fuse #12 (10amp) provides 12 volts to the coil side of both the relays and the ignition switch. Fuse #6 (30 amps) supplies 12 volts to the output side of the relay. Fuse #16 (15 amp) from the relay output to the Oxygen Sensors and Fuse #26 (15 amp) relay output to the PCM. Fuse #24 (20 amp) is Fuel pump relay output to fuel pump. Fuse #19 (10 amp) supplies 12 volts direct to the PCM.
look for burned or melted wires in the offending circuit.
sounds like you wiggled a wire while installing new relay.

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How is the right way to install a camshaft sensor in a 1998 4 cyl eclipse non turbo ?


If the ASD (in your case MFI) is working and your getting fuel and no spark.You need to test the coil for power ,look at the coil terminal the middle is power (B+) or 12 volts. Each other side is for ignition signal for that cylinder, Just measure the middle of the 3 wire with key on if you have 12 volts you are going to need a ECM ,There is no programing needed just match it drop in and play

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1998 Ford Explorer, 4.0 SOHC No Spark. Engine will crank but it won't start. Replaced the Crankshaft Sensor, Coil Pack, & Spark Plugs. Still no spark. What next?


You are at thhe right trail what controls spark is coil pack crank sensor sparkplugs and plug wire but the most important is power . I mean 12 volt connections and ground This includes checking fuses you need a simple volt meter doesnt have to expensive or fancy just to pick up 12 volts let start with fuses in the engine juction box (there not mark to what it belongs to) make sure none are open. especially fuse 19 and 24 , next go to the crank sensor make sure the tabs are snuggly on now to the coil pack there is a red and light green wire this comes from ignition and feeds 12 volts at the coil pack measure that voltage is it 12 volts if not correct it this is from ignition switch ( you can make a tool that feed 12 volt with a wire and a fuse in series and attatch it to battery and the primary wire this is known as hot wire) next go to the ECM wiggle the wires see if that get a connection going if not go back to the ICM here are the wire you are to measure the tan light green, this is from ECM and it is pulsed it measure 5vlts to 0 volts switched then measure the tan orange the same thing 5 volts to zero,then tan white again 5vlts to zero. any one of these 5 to zero fails you fix is the ecm

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1 Answer

I have no spark to my plugs on my Dakota


Hi, first check the 20 amp fuse D. If good, use a 12 volt test light to check for power on the positive coil terminal (green wire/orange stripe, key on). If no power, the problem is with the ASD relay ot ignition switch. If power, the problem is the timing signal from the PCM or the coil itself.
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pull out the auto-shutdown relay and probe the socket with a 12 volt test light:
hook the test light clip to ground and probe the socket terminals. There should be one hot terminal (from fuse D) with the key off and 2 hot terminals with the key on (turn-on signal from ignition switch).
Move the test light clip to battery positive and probe the socket again.
With the key on, there should be one terminal that lights the light brightly (PCM turn-on signal) and one that light it dimly (load terminal)

If there is power to the coil, test the coil primary and secondary winding impedances using an ohmmeter. If the coil is good, test the crankshaft position sensor. Set the ohmmeter to the 1K-10K scale. Place an ohmmeter across terminals B and C (see the illustration). The meter reading should be open (infinite resistance). If a low resistance is read, replace the camshaft position sensor.
Please let me know if you have questions, and thanks for using FixYa.

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Hello! There isn't power to ECM pins 109 and 111 because the ECM relay is not pulling...Pins 1 and 3 (White/Black wire) are tied together in the harness and should not show a change in symptom if jumped together...Also, Pins 1 and 3 are fed battery from fuse # 36 (15A hot at all times) and both pins must read +12 volts...Pin 2 of the relay coil is the pulling ground from the ECM...Reading across pins 1 and 2 with the key in the ON position should not read +12 volts...If it does the relay coil is open...With the key on the relay would show a voltage drop across the coil...Check pins 1 and 3...must be tied together and have +12 volts from fuse # 36 (15A hot at all times)...Replace ECM relay...See photo...............Guru....Saailer...

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1997 dodge ram won't start. My fuel pump does not run and coil won't spark. Iv'e checked fuses and relays and they look fine. Could a bad fuel pump cause the asd to kill power to the coil?


First check any ignition/fuel related fuses. Check to make sure you have 12 volts coming into the pump and coil. If nothing to the fuel pump replace the fuel pump relay - if you do have power to the fuel pump then replace the pump. If nothing is coming to the coil it is either an ignition relay or a wiring issue. If you have 12 volts to the coil but no spark then replace the coil.
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2 Answers

I have a 1991 chevy truck, I am getting no spark. I have changed the ECM, distributor and coil. still no results. I have no idea of what to do.


check to see if your truck has a crankshaft position sensor, its usually located behind the harmonic balancer or right near there, if the sensor went bad or if the wiring got messed up there will be no signal to the ecm telling the ecm when to send spark to the coil. the crankshaft position sensor is responsible for telling the computer when to fire the spark plugs based on rpm and timing. check the wires on the crankshaft position sensor, if they look fine, replace the sensor, hope this helps!

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