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No spark to plugs and no power from relays to coils

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1. Have you checked all electrical wirings that supplies the coil and relays, are all wires in good conditions?
2. Have you checked the main fuse (normally a 30A ones) located along the "+" (Red electrical cable from your battery).
3.Have you checked the secondary fuses, normally you would have 3 to 6 fuses for different electrical function, ie,. turn siggnal, horn, headlight, etc. located either by you RH cover or near your gauges.
4. To do all those you may need to use an Ohm meter to test their continuitis.
Cheers.

Posted on Mar 26, 2011

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Posted on Jan 02, 2017

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Not James, but maybe I can help: Under the dash in the fuse/relay box is the ignition coil relay. This sends battery voltage on the black/white wire to all four coils. With key in on, all 4 coils should have power to them on this black/white wire. If no power, check fuse #2, a 15 amp fuse which sends power to the ignition coil relay, and on to the coils when the relay is energized by the ecu/pcm. Only thing else to cause spark is when the ecu/pcm sends a signal to the coil's Ignition Control Module (housed inside each coil assembly), which controls the primary circuit (the black/white wire), and causes high voltage to the spark plugs.

So check the black/white wire to the coils. If power there with key in on, check for spark at a spark plug when cranking the engine over. If power to coils but no spark, possibly a crankshaft position sensor or cam position sensor giving a bad signal to the ecu/pcm. Good luck.

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Here's a couple things you can try. First, swap the ASD Relay with one of the same type relays in the relay box. If it still doesn't start check every fuse. If it still doesn't start check power and ground at the "COIL PACK" If power and ground are good Replace the Coils Pack. If there is no power and ground at the coil pack then make certain you are getting power from the ignition switch to the ASD Relay. Hope this helps and have an awesome day Leroy.

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Check to see if there is power to the injectors. They are fed from the same fuse and relay. If there is no fuel pressure than the fuse would be the fist suspect sin the ASD and fuel pump relay are fed off the same fuse. The fuse is fuse 21 in the power distribution center.

If the fuse is good try swapping the ASD relay with another relay in the fuse block that is the same. If you know have spark than replace the ASD relay.

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Is the PCM controlling the coil's ? You have B+ voltage at the dark green with orange trace wire at the coil pack ? The other two wire's go to the PCM - the PCM has transistor's that supply a ground to those two wire's when signal from crank sensor is seen . Opens an closes to build up voltage an to release a spark . You can test this control with a test light . Video's on youtube.

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The relay for the fuel pump is working but have you checked that the pump is actually pressurising the system . Next you have power at the coil but is it getting to the spark plugs from the distributor.

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sounds like the autoshutoff relay may be bad..it controls the ingition and the fuel pump too..if the pump works check for spark by inserting a screwdriver into a pulled off spark plug wire and look for a decent spark between the screwdriver shaft and any ground like the block..if no spark the relay may not be powering up the ignition system..

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1 Answer

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I'll try to help you, John.
For spark: If your spark plugs, spark plug wires, dist. cap, and rotor are good, check the coil. Take off the negative battery cable. Use an ohmmeter and check resistance between the coil primary positive terminal and the frame of the coil-ohmmeter should show infinite resistance, if not, replace coil. Put ohmmeter positive lead on coil primary positive terminal, and ohmmeter negative lead on coil primary negative terminal-resistance should be zero or nearly zero, if not, replace coil. Connect ohmmeter negative lead to the negative primary terminal and ohmmeter positive lead to the high voltage terminal of the coil. Ohmmeter should not show infinite resistance, if it does, replace coil.
If coil is good (or has been swapped), check that coil primary has power to it with key on. If it does, and no spark, the problem could be the ignition module or the pickup coil. The ignition module should be mounted with the ignition coil. The pickup coil is inside the distributor-this pickup coil is what tells the computer (ecu) the crankshaft position, so is critical for spark timing.

For the pump: the fuel pump relay is in the power distribution box under the hood. When the ignition switch's run wire energizes the relay's coil, power is sent to the pump. You could check for a signal on the pump wire at the tank, with the engine cranking Should be a steady signal then. If not, pull the relay out to check that the power feed for the pump is still there. The power to the relay comes from Fuse link G, a 20 amp rated green fuse link. It is hot at all times, so check for a power signal on one of the relay terminals with key off. One terminal should have power. If not, check fuse link G. If it does have power, put relay back in and have someone cycle the key-relay should click-may feel or hear it. If nothing, try a different relay. If relay was good, but no power to pump, pull relay and check terminals that relay plugs into: with key held in crank, two terminals at relay should have power-the power feed from fuse link G, and now the ignition switch signal to the relay coil side. If all checks out, probably a bad pump. If you checked for power at the tank with the engine cranking, and did have power, that is for sure a pump that needs replacing.
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The ignition power stage fails, and especially the rpm sensor. Have you checked the trouble codes?

Bret
RepairPal.com


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