No spark conditions?

Tiny
DAMIEN PARISH
  • MEMBER
  • 1998 SATURN SL2
  • 1.9L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 198,000 MILES
Car has just stalled out with no spark at ECT. There is power and ground there is power to all fuses and relays. With key on I have 5-volt reference at to MAP, TPS, EGR. I have changed the CKP. No further test after. Testing under hood fuses again noticed there were 3 fuses that had brighter lights on. Left car and next day I tested all fuses again all were good with 11.9 reading. Before leaving the car again. With key in the on position I have no power at the TRS/LP TRS 3/4 and TRS 2/TCC fuses. What causes this with temperatures in the -0 I don't want to freeze on next tests. I have ordered a ETCM and would love try and diagnose a different problem before putting it on come next Monday if it isn't the culprit.
Tuesday, February 18th, 2025 AT 11:47 AM

2 Replies

Tiny
DAMIEN PARISH
  • MEMBER
  • 2 POSTS
I forgot to put in that there are no codes, and I have tried starting it in neutral with no luck. Prior to this happening washed the bottom of the trans off of fluid to find a leak and it ended up being at the bottom trans cooler line, so it was a bit low on fluid. It hasn't got warm enough to thaw much so I'm thinking some may have got wet and froze.
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Tuesday, February 18th, 2025 AT 5:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,192 POSTS
I would try unplugging the engine coolant temperature sensor to see if that makes a difference. This sensor can short out and cause the PCM not to give a spark trigger signal. The TRS/LP TRS 3/4 and TRS 2/TCC fuses are powered by the fuel pump relay so they will only have power when the engine is cranking (about 5 seconds) or when the engine is running. These fuses feed the transmission actuators and will not have an effect on the spark issue.

Please go over this new guide as well to help:

https://www.2carpros.com/articles/no-ignition-spark

Please go over this guide and get back to us.

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Tuesday, February 18th, 2025 AT 6:04 PM

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