P0343 Error, Have checked/tried everything, CASE relearn the cause?
10-25-2013, 05:32 PM
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P0343 Error, Have checked/tried everything, CASE relearn the cause? Just finished up building and swapping in an LS1 I built for my 240sx a couple weeks ago and recently a P0343 error has popped up.
By what I researched this is due to the computer seeing the cam sensor signal staying high when it should switch. It could be caused by bad wiring, bad sensor or cam bolts loosening. I followed the troubleshooting guide and have determined the following:
- cam sensor is getting proper +12 and ground
- Jumpering to the signal from +12 causes cam high-low and low-high to increment in EFI live
- cam sensor is brand new and not touching cam
- Checked cam bolts and retaining plate
- Oil pressure good (50 psi at idle)
- Tach output wire works fine with 240 stock tach
- engine is hard to start sometimes, pops and hunts for what stroke its on, and other times starts immediately
- when checking cam I also verified cam relector was centered in cam position sensor hole. (the two alternating reluctors were centered, not sure if this is right or not)
- cam is an MS3, timing chain and sprockets are new LS2.
The only thing I can think of is that the PCM needs a CASE relearn. I have not tried this yet since I have to wire up the P/N and E brake inputs, but I'm going to try this next.
Thanks!
Eric
By what I researched this is due to the computer seeing the cam sensor signal staying high when it should switch. It could be caused by bad wiring, bad sensor or cam bolts loosening. I followed the troubleshooting guide and have determined the following:
- cam sensor is getting proper +12 and ground
- Jumpering to the signal from +12 causes cam high-low and low-high to increment in EFI live
- cam sensor is brand new and not touching cam
- Checked cam bolts and retaining plate
- Oil pressure good (50 psi at idle)
- Tach output wire works fine with 240 stock tach
- engine is hard to start sometimes, pops and hunts for what stroke its on, and other times starts immediately
- when checking cam I also verified cam relector was centered in cam position sensor hole. (the two alternating reluctors were centered, not sure if this is right or not)
- cam is an MS3, timing chain and sprockets are new LS2.
The only thing I can think of is that the PCM needs a CASE relearn. I have not tried this yet since I have to wire up the P/N and E brake inputs, but I'm going to try this next.
Thanks!
Eric
