Welcome to knock module hell
#1
Welcome to knock module hell
I'm having issues getting my knock module on my MS3X working. It constantly reads 2.4% whether the sensor is plugged in or not.
My setup:
What I have done:
I have been able to get the knock module to respond by playing a 6.940khz frequency in to it K1 from my laptop headphone jack.
Questions I am still struggling with:
Thanks in advance for visiting hell.
My setup:
- MS3X w/ knock module (recently upgraded from a v3 MS2) built using trubokitty.com.
- 90 Miata with JDM 05 VVT engine (turbo'ed of course)
What I have done:
- Replaced the knock sensor
- Checked for continuity from knock sensor plug to K1 on internal knock module (using SPR3)
- Checked continuity of other pin of knock sensor plug grounded on ecu plug ground.
- Resoldered the connections from the knock module to MS3 daughtercard
- Checked continuity from PM2 to knock module
- Replaced c6 and c7 on the knock sensor module (I was seeing 2.5v on the south side of the caps, but not on the sensor side.) I thought that was the issue. :/
- Beat my head against the wall.
- Said F^%&k it and started tuning the car without the extra safety.
I have been able to get the knock module to respond by playing a 6.940khz frequency in to it K1 from my laptop headphone jack.
Questions I am still struggling with:
- Is there supposed to be a bias voltage on K1 and K2?
- What am I missing?
Thanks in advance for visiting hell.
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