No spark from trailing coil
07-10-15, 09:51 PM
#1
Full Member
Thread Starter
No spark from trailing coil
Hey all I've hit this common problem. And ive tried many of the common fixes to no avail
No spark on trailing plugs
Tach is dead
Jumped the tach wire from leading and tach works
Checked the spark with a fresh plug outside engine, no spark.
Used a multimeter to test the wiring, all the prongs on the connectors to the trailing coil are getting the correct voltage.
Tried a known working coil straight out of a friends car, didnt work
Tried a different known working coil, still didnt work.
Trailing coil is earthed correctly
Alternator is working correctly.
Spark plugs themselves are fine.
Car runs fine, but trailing is definitely not sparking.
Please help I cannot isolate the issue
Car is a JDM S5 Turbo
No spark on trailing plugs
Tach is dead
Jumped the tach wire from leading and tach works
Checked the spark with a fresh plug outside engine, no spark.
Used a multimeter to test the wiring, all the prongs on the connectors to the trailing coil are getting the correct voltage.
Tried a known working coil straight out of a friends car, didnt work
Tried a different known working coil, still didnt work.
Trailing coil is earthed correctly
Alternator is working correctly.
Spark plugs themselves are fine.
Car runs fine, but trailing is definitely not sparking.
Please help I cannot isolate the issue
Car is a JDM S5 Turbo
07-11-15, 10:34 AM
#2
Engine, Not Motor
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Did it ever work?
Scope the trailing coil trigger and select lines and verify the ECU is sending a signal.
If it isn't, check the CAS signals. If OK, swap the ECU.
Scope the trailing coil trigger and select lines and verify the ECU is sending a signal.
If it isn't, check the CAS signals. If OK, swap the ECU.
07-15-15, 01:17 AM
#3
Full Member
Thread Starter
Yes, trailing was firing and working fine until it mysteriously stopped
Considering the coil itself is receiving the right voltage etc. Doesnt that mean the ecu is working?
If not how do I go about testing the ecu is sending the signal?
Considering the coil itself is receiving the right voltage etc. Doesnt that mean the ecu is working?
If not how do I go about testing the ecu is sending the signal?
07-18-15, 09:00 AM
#5
so you got pistons oh wow
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The ECU works by sending ground signals. The easiest way to test it is by getting a light tester and put the clamp in the positive side and the tip of the tester on the negative side and have someone start the car if the light is coming on and off and the tester then your computer is sending the signal. If it doesn't start blinking then your ECU is not sending ground signals. Or most likely there is a broken wire somewhere. Hope this helps
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